B K PRECISION MDL001 MDL Series Programmable DC Electronic Load Instruction Manual
- June 16, 2024
- B&K Precision
Table of Contents
- MDL001 MDL Series Programmable DC Electronic Load
- Product Information: MDL Series Programmable DC Electronic
- Specifications:
- Safety Summary:
- Environmental Conditions:
- Before Applying Power:
- Do Not Operate in an Explosive Atmosphere:
- Do Not Service or Adjust Alone:
- Menu List:
- Setup Menu:
- Configuration Menu:
- Automatic Test Menu:
- Q: Can I use the MDL Series Programmable DC Electronic Load
- Q: What is the maximum relative humidity that the instrument
- Q: Can the instrument be operated at high altitudes?
- Q: How can I access the different menus on the DC electronic
MDL001 MDL Series Programmable DC Electronic Load
Product Information: MDL Series Programmable DC Electronic
Load
Specifications:
-
Models: MDL001, MDL002, MDL200, MDL252, MDL302, MDL305, MDL400,
MDL505, MDL600 -
Indoor use
-
Pollution degree 2 environments
-
Maximum relative humidity: 95%
-
Altitude: Up to 2000 meters
Safety Summary:
The following general safety precautions must be observed during
all phases of operation of this instrument. Failure to comply with
these precautions or with specific warnings elsewhere in this
manual violates safety standards of design, manufacture, and
intended use of the instrument. We assume no liability for the
Customer’s failure to comply with these requirements.
Environmental Conditions:
This instrument is intended for indoor use, pollution degree 2
environments. It is designed to operate at a maximum relative
humidity of 95% and at altitudes of up to 2000 meters. Refer to the
specifications tables for the AC mains voltage requirements and
ambient operating temperature range.
Before Applying Power:
Verify that all safety precautions are taken. Note the
instrument’s external markings described under Safety Symbols.
Do Not Operate in an Explosive Atmosphere:
Do not operate the instrument in the presence of fumes or
flammable gases.
Do Not Service or Adjust Alone:
Do not try to do some internal service or adjustment unless
another person capable of rendering first aid resuscitation is
present.
Compliance Statements:
CE Declaration of Conformity: The DC electronic load meets the
requirements of Low Voltage Directive 73/23/EEC and Electromagnetic
Compatibility Directive 89/336/EEC amended by 93/68/EEC.
Low Voltage Directive: EN61010-1: 2001
EMC Directive: EN50081-1 – EN50082-1
Product Usage Instructions:
Menu List:
The product has the following menus:
- Setup Menu
- Configuration Menu
- Automatic Test Menu
Setup Menu:
The Setup Menu allows you to configure various settings for the
DC electronic load. Refer to the user manual for detailed
instructions on how to access and navigate through the Setup
Menu.
Configuration Menu:
The Configuration Menu provides options for customizing the
operation of the DC electronic load. This includes setting up
communication protocols, configuring alarms, and adjusting
calibration settings. Refer to the user manual for detailed
instructions on how to access and navigate through the
Configuration Menu.
Automatic Test Menu:
The Automatic Test Menu enables you to perform automated tests
using predefined test profiles. This menu allows you to set up test
parameters, run tests, and view test results. Refer to the user
manual for detailed instructions on how to access and navigate
through the Automatic Test Menu.
FAQ:
Q: Can I use the MDL Series Programmable DC Electronic Load
outdoors?
A: No, the instrument is intended for indoor use only.
Q: What is the maximum relative humidity that the instrument
can operate at?
A: The instrument is designed to operate at a maximum relative
humidity of 95%.
Q: Can the instrument be operated at high altitudes?
A: Yes, the instrument can operate at altitudes of up to 2000
meters.
Q: How can I access the different menus on the DC electronic
load?
A: The DC electronic load has three menus: Setup Menu,
Configuration Menu, and Automatic Test Menu. Refer to the user
manual for detailed instructions on how to access and navigate
through these menus.
MDL Series Programmable DC Electronic Load
Models: MDL001, MDL002, MDL200, MDL252, MDL302, MDL305, MDL400, MDL505, MDL600
USER MANUAL
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Safety Summary
The following general safety precautions must be observed during all phases of
operation of this instrument. Failure to comply with these precautions or with
specific warnings elsewhere in this manual violates safety standards of
design, manufacture, and intended use of the instrument. We assume no
liability for the Customer’s failure to comply with these requirements.
ENVIRONMENTAL CONDITIONS This instrument is intended for indoor use, pollution
degree 2 environments. It is designed to operate at a maximum relative
humidity of 95% and at altitudes of up to 2000 meters. Refer to the
specifications tables for the AC mains voltage requirements and ambient
operating temperature range.
BEFORE APPLYING POWER Verify that all safety precautions are taken. Note the
instrument’s external markings described under “Safety Symbols”.
GROUND THE INSTRUMENT This product is a Safety Class 1 instrument (provided
with a protective earth terminal). To minimize shock hazard, the instrument
chassis and cover must be connected to an electrical ground. The instrument
must be connected to the AC mains power through a grounded power cable, with
the ground wire firmly connected to an electrical ground (safety ground) at
the power outlet. Note: Any interruption of the protective (grounding)
conductor or disconnection of the protective earth terminal will cause a
potential shock hazard that could result in personal injury.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the
presence of fumes or flammable gases.
KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument
covers except as instructed in this guide for installing or removing
electronic load modules. Component replacement and internal adjustments must
be made only by qualified service personnel. Do not replace components with
power cable connected. Under certain conditions dangerous voltages may exist
even with the power cable removed. To avoid injuries, always disconnect power,
discharge circuits, and remove external voltage sources before touching
components.
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DO NOT SERVICE OR ADJUST ALONE Do not try to do some internal service or
adjustment unless another person capable of rendering first aid resuscitation
is present.
Safety Symbols
Direct current Alternating current Both direct and alternating current
Protective earth (ground) terminal Attention (refer to accompanying documents)
WARNING The WARNING sign denotes a hazard. It calls attention to a procedure,
practice, or the like, which, if not correctly performed or adhered to, could
result in personal injury. Do not proceed beyond a WARNING sign until the
indicated conditions are fully understood and met.
CAUTION The CAUTION sign denotes a hazard. It calls attention to an operating
procedure, or the like, which, if not correctly performed or adhered to, could
result in damage to or destruction of part or all of the product. Do not
proceed beyond a CAUTION sign until the indicated conditions are fully
understood and met.
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Compliance Statements
Disposal of Old Electrical & Electronic Equipment (Applicable in the European
Union and other European countries with separate collection systems) This
product is subject to Directive 2002/96/EC of the European Parliament and the
Council of the European Union on waste electrical and electronic equipment
(WEEE), and in jurisdictions adopting that Directive, is marked as being put
on the market after August 13, 2005, and should not be disposed of as unsorted
municipal waste. Please utilize your local WEEE collection facilities in the
disposition of this product and otherwise observe all applicable requirements.
CE Declaration of Conformity
The DC electronic load meets the requirements of Low Voltage Directive
73/23/EEC and Electromagnetic Compatibility Directive 89/336/EEC amended by
93/68/EEC. Low Voltage Directive
– EN61010-1: 2001 EMC Directive
– EN50081-1 – EN50082-1
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Table of Contents
Safety Summary ………………………………………………………………………… 2 Compliance
Statements………………………………………………………………. 4 Product Overview
……………………………………………………………………… 8
Description ………………………………………………………………………………………………………………8 Features
………………………………………………………………………………………………………………….9 Front
Panel…………………………………………………………………………………………………………….10 Rear Panel
……………………………………………………………………………………………………………..11 Protection
Functions………………………………………………………………………………………………..12
Overvoltage Protection (OVP) ………………………………………………………………………………..12 Overcurrent
Protection (OCP)…………………………………………………………………………………12 Overpower Protection (OPP)
………………………………………………………………………………….14 Overtemperature Protection
(OTP)………………………………………………………………………….15 Reverse Voltage Protection (LRV/RRV)
…………………………………………………………………….15
Menu List ………………………………………………………………………………………………………………16
Setup Menu ………………………………………………………………………………………………………..16 Configuration Menu
……………………………………………………………………………………………..19 Automatic Test
Menu……………………………………………………………………………………………20
Installation……………………………………………………………………………… 21
Inspection ……………………………………………………………………………………………………………..21 Cleaning
………………………………………………………………………………………………………………..21 Installing Modules
…………………………………………………………………………………………………..22 Channel Number
…………………………………………………………………………………………………….24 Location
………………………………………………………………………………………………………………..25 Input Voltage
Selection…………………………………………………………………………………………….27 Turn-On Checkout
…………………………………………………………………………………………………..28 If the Electronic Load Does Not Turn
On………………………………………………………………………29
Load Connection ……………………………………………………………………… 30
Remote Sense Connection ………………………………………………………………………………………..31 Parallel
Connection………………………………………………………………………………………………….32 Mainframe 8-pin Control
Connector……………………………………………………………………………33 External Trigger Connections
…………………………………………………………………………………….34
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External ON/OFF Control Connection ………………………………………………………………………….35 Mainframe
Extension Connection ………………………………………………………………………………35 PC Control Connection
……………………………………………………………………………………………..36
Operation ………………………………………………………………………………. 37
Operating Modes…………………………………………………………………………………………………….37
Constant Current (CC) mode …………………………………………………………………………………..37 Constant
Voltage (CV) Mode ………………………………………………………………………………….39 Constant Resistance (CR)
Mode ………………………………………………………………………………40 Constant Power (CW) Mode
…………………………………………………………………………………..41 Constant Impedance (CZ)
Mode………………………………………………………………………………42 Setting CV, CC, CR, CW, CZ Mode
…………………………………………………………………………….44
Local Operation ………………………………………………………………………………………………………45
Mainframe Panel………………………………………………………………………………………………….45 Module
Panel………………………………………………………………………………………………………48 Module Panel Lock
……………………………………………………………………………………………….49 Switching Channels
………………………………………………………………………………………………49 Channel Synchronization
……………………………………………………………………………………….49 VFD Indicator Function Description
…………………………………………………………………………50
Transient Operation ………………………………………………………………………………………………..51
Continuous…………………………………………………………………………………………………………. 51 Pulse
………………………………………………………………………………………………………………….52 Toggle
………………………………………………………………………………………………………………..53 Setting Up A/B Transient
Operation ………………………………………………………………………..53
List Operation…………………………………………………………………………………………………………56
Setting Up List Operation Mode………………………………………………………………………………56
Triggered Operation ………………………………………………………………………………………………..60
Trigger Function …………………………………………………………………………………………………..60 Trigger Source
……………………………………………………………………………………………………..60
Short Operation………………………………………………………………………………………………………60 Input On/Off
Operation ……………………………………………………………………………………………61 Von
Operation………………………………………………………………………………………………………..61
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Setting Up Von Function………………………………………………………………………………………..62 Save and Recall
Operation ………………………………………………………………………………………..63 Module Controlling
Link……………………………………………………………………………………………64
Voltage Failure Indication………………………………………………………………………………………65 Current
Monitoring ………………………………………………………………………………………………65 Digital I/O
…………………………………………………………………………………………………………..65 Remote Sense Function
…………………………………………………………………………………………66 External Analog
Control…………………………………………………………………………………………66 Automatic Test
……………………………………………………………………………………………………….66 Setting Up Test Files
……………………………………………………………………………………………..66 Recall Test Files
……………………………………………………………………………………………………72 Remote
Operation…………………………………………………………………………………………………..72 USB Interface
………………………………………………………………………………………………………73 Ethernet Interface
………………………………………………………………………………………………..73 GPIB Interface
……………………………………………………………………………………………………..73 RS-232
Interface…………………………………………………………………………………………………..74
RS-232 Data Format …………………………………………………………………………………………………..74 Baud Rate
…………………………………………………………………………………………………………………74 Parity
……………………………………………………………………………………………………………………….74 RS-232 Flow
Control…………………………………………………………………………………………………..75 RS-232 Connections
…………………………………………………………………………………………………..75 RS-232
Troubleshooting……………………………………………………………………………………………..76 Communication Setting
…………………………………………………………………………………………76
Specifications ………………………………………………………………………….. 77
Supplementary Characteristics…………………………………………………………………………………..79
SERVICE INFORMATION…………………………………………………………….. 80 LIMITED THREE-YEAR WARRANTY
………………………………………………. 81
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Product Overview
This section describes the main features and menus of the MDL Series DC
Electronic Load. The MDL Series is comprised of two parts, mainframes and
modules. The mainframes mentioned are the MDL001 mainframe and the MDL002
mainframe extension. Modules in this series include the MDL200, MDL252,
MDL302, MDL305, MDL400, MDL505, and MDL600. Unless otherwise noted, this
document will refer to all of these instruments as “electronic load”. The
range of each module’s specific voltage, current, and power is listed in the
Specifications section.
Description
The MDL Series is a multi-channel programmable DC electronic load system. With
programming and remote control capabilities, the MDL Series DC electronic load
can provide multiple solutions according to the requirements of your design
and is suitable for testing a wide range of power sources from multi-output DC
power supplies to batteries, fuel cells, and photovoltaic arrays.
Up to four modules can be installed into the MDL001 mainframe to support up to
a total of 8 channels. Adding the MDL002 mainframe extension will enable the
system to support four additional module slots for a maximum of 16 channels.
The electronic load is configured by installing user-selectable modules into
the mainframe and operated using the front panel keypad and rotary knob. It
can also be controlled remotely via USB, RS-232, LAN, or GPIB interface. The
electronic load modules all have similar functions, but may differ in range of
input voltage, current, and power. The high resolution voltage and current
measurement system provides both accuracy and convenience.
The electronic load can be used in one of five different operation modes:
constant voltage (CV), constant current (CC), constant resistance (CR),
constant power (CW), or constant impedance (CZ). All panel operation and
programming functions are carried out on the MDL001 mainframe panel. A wide
range of dynamic loading applications can be simulated through user-
programmable slew rates, load levels, duration, and conducting voltage.
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Features
· CC/CV/CR/CW/CZ operating modes · Removable modules for easy system
flexibility · Bright VFD display for both mainframe and modules · Power range
up to 2400 W (4800 W with mainframe extension) · Supports up to 16 channels
with mainframe extension · Operate identical modules in parallel mode for high
current applications · Synchronous load on/off function · 16-bit voltage and
current metering providing high resolution of 0.1 mV and 0.01 mA · Transient
mode up to 25 kHz · List mode (sequence mode) minimum 20 us step width with
84 user programmable steps · Adjustable slew rate in CC mode · Automatic test
function · 101 memory areas to save/recall setting parameters · Analog current
control and monitoring · Remote sensing · Standard LAN, GPIB, USBTMC compliant
USB, and RS-232 interfaces with SCPI protocol
support · OVP/OCP/OPP/OTP and reverse voltage protection
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Front Panel
Figure 1 – MDL Series Front Panel
- VFD DISPLAY Displays electronic load information.
- MODULE PANEL KEYS Controls module functions. Refer to Module section for more details on the use of these keys.
- ADJUSTMENT KNOB Used to change parameters.
- MAINFRAME FUNCTION KEYS Controls each channel’s operating status. Refer to Mainframe section for more details on the use of these keys.
- MAINFRAME NUMERIC ENTRY AND SHIFT KEYS Refer to Mainframe section for more details on the use of these keys.
- POWER SWITCH Turns the system on or off.
- MAINFRAME 8) MODULES
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Rear Panel
Figure 2 – MDL Series Rear Panel
- GPIB interface 2) Input terminal of module 3) Remote measurement and external input control terminal 4) Current monitoring output 5) Digital I/O and VF output terminal 6) Extended module interface 7) AC Power input socket
- USB interface 9) Line voltage selection switch (110V/220V) 10) Trigger I/O
and load on/off terminals 11) LAN interface 12) RS-232 interface 13) Not used
for factory use only
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Protection Functions
The electronic load has the following protection functions: Overvoltage
protection (OVP), overcurrent protection (OCP), overpower protection (OPP),
overtemperature protection (OTP), and local and remote reverse voltage
protection (LRV/RRV).
The mainframe will act appropriately once any of the above protections are
active. You can press any button on the front panel to restore the protection
function. For example, if the electronic load triggers the overtemperature
protection, the buzzer will alarm, the input will automatically turn off, and
the mainframe VFD will display OTP.
Overvoltage Protection (OVP)
If the OVP circuit has triggered, input will turn off, buzzer alarm will go
off, and the status register’s OV and VF bit will be set. The mainframe will
display OVP and the condition will remain until they are reset. Once
overvoltage protection occurs, the 8-pin connector’s VF pin on the rear panel
will output TTL high voltage level. You can control the output state of the
power supply under test via this pin (see Figure 31).
Operations to Clear the OVP State Check whether the input voltage is within
the electronic load’s rated voltage or the programmed protection voltage
ranges. If it is outside the range, please disconnect the device under test.
Then press any key on the front panel or remotely send SCPI command
PROTection:CLEar. The OVP displayed on the front panel will turn off and the
electronic load exits OVP protection state.
Overcurrent Protection (OCP)
The electronic load includes both hardware and software overcurrent protection
features.
Hardware OCP – The electronic load’s maximum input current will be limited to
approximately 110% of the current range. Once the hardware OCP is triggered,
the status register’s OC bit will be set. When the hardware OCP is removed,
the status register’s OC bit will be reset. Hardware overcurrent protection
will not affect the electronic load’s on/off state.
Software OCP – Users can set the electronic load’s software OCP value with the
following steps.
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Panel Operations 1. Power on the electronic load.
2. Press Shift + to enter Configuration menu.
3. Press key to select
4. Press key to select
5. Press key to select
6. Press key to select
7. Press Esc key to exit menus.
VFD Display
Self-test
Sync On Set Von Meter Protect List Ext. Ctrl Set About Exit Max Power Set
Alimit State
Alimit Point
Alimit Delay
Plimit Point
Plimit Delay
OnTimer State
OnTimer Set
Exit
On
Off (Default)
Current Limit
Set=
40.000A
Current Limit
Delay= 3S
If the electronic load’s current value is above the set overcurrent protection value, the electronic load will automatically turn off and the VFD will display OCP. At the same time, the OC and PS bits in the status register will be set and remain until they are reset.
Operations to Clear the OCP State Check whether the input current is within the electronic load’s rated current or the programmed protection current ranges. If it is outside the range, disconnect the device under test. Then press any key on the front panel or remotely send SCPI command PROTection:CLEar. The OCP displayed on the front panel will turn off and the load exits OCP protection state.
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Overpower Protection (OPP)
The electronic load includes both hardware and software OPP features.
Hardware OPP In the event that the electronic load’s input power exceeds the set power protection limit, the hardware OPP will limit the power. Once the hardware OPP is triggered, the status register’s OP bit will be set. When the hardware OPP is removed, the status register’s OP bit will be reset. Hardware overpower protection will not turn the electronic load’s input off.
Software OPP – Users can set the electronic load’s software OPP value with the following steps.
Panel Operations
VFD Display
1. Power on the electronic load.
Self-test
Sync On Set
Von
Meter
2. Press Shift + to enter Configuration menu.
Protect List
Ext. Ctrl Set
About
Exit
Max Power Set
Alimit State
Alimit Point
3. Press key to select
Alimit Delay Plimit Point Plimit Delay
OnTimer State
OnTimer Set
4. Press key to select
Exit Power Limit
power value and press Enter to confirm. 5. Press key to select
Set= 210.00W Power Limit
time before alarm and press Enter to confirm.
Delay= 3S
6. Press Esc key to exit menus.
If the electronic load’s power value is above the set overpower protection value, the electronic load will automatically turn off and the VFD will display OPP. At the same time, the OP and PS bits in the status register will be set and remain until they are reset.
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Operations to Clear the OPP State Check whether the input power is within the
rated power range or the programmed protection ranges. If it is outside the
range, disconnect the device under test. Then press any key on the front panel
or remotely send command PROTection:CLEar. The OPP displayed on the front
panel will turn off and the electronic load exits OPP protection state.
Overtemperature Protection (OTP)
Each module has an overtemperature protection circuit, which will turn off the
input if the internal temperature exceeds safe limits. When the electronic
load’s internal circuit temperature is over 85C, the load will enable OTP.
Input will automatically be turned off and the VFD will display OTP. At the
same time the OT and PS bits in the status register will be set and remain
until they are reset.
Operations to Clear the OTP State When the electronic load temperature has
dropped below the protection point, press any key on the front panel or
remotely send command PROTection:CLEar. The OTP displayed on the front panel
will turn off and the electronic load exits OTP protection state.
Reverse Voltage Protection (LRV/RRV)
This function protects the electronic load in case the input DC voltage lines
are connected with the wrong polarity. When a reverse voltage (LRV local
reverse voltage, RRV remote reverse voltage) connection condition is
detected, the input will immediately turn off, the buzzer will alarm the user,
and the status register’s reverse voltage (LRV/RRV) and VF bits will be set.
The mainframe will display LRV/RRV until they are reset.
In this condition, the 8-pin connector’s VF pin will output a high level. You
can disconnect the power supply via this signal (see Figure 31).
Operations to Clear the Reverse Voltage State Check whether the connection is
reversed. If so, disconnect the device to be measured and the reverse voltage
state will be cleared.
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Menu List
The following menus can be viewed on the VFD display. Use keys to scroll through the menu list and press Enter key to enter the selected menu function. Use keys to scroll through the VFD screen and press Enter key to enter its submenu. Press Esc to go back to the previous menu selection. Pressing number keys can directly select a channel.
Setup Menu
Press Setup key to enter the setup menu.
SETUP
MODE
Select working mode
CONST CURRENT
Load works in CC mode
CONST VOLTAGE
Load works in CV mode
CONST RESISTANCE Load works in CR mode
CONST POWER
Load works in CW mode
CONST IMPEDANCE Load works in CZ mode
CC/CV RANGE Switch the range
HIGH RANGE
Set high range
LOW RANGE
Set low range
I / V / R / W SET Set the working current/voltage/resistance/power value
Vmax/Amax
Set up the maximum voltage/current limit for Automatic test mode
Vmin/Amin
Set up the minimum voltage/current limit for Automatic test mode
=2.500A/us
Set the rising slew rate (only in CC mode)
=2.500A/us
Set the falling slew rate (only in CC mode)
TRAN A=0.00A Set up level A value
Ta=0.0005S
Set up level A width
TRAN B=0.00A Set up level B value
Tb=0.0005S
Set up level B width
T MODE
Set up the transient mode
CONTINUOUS
Continuous mode
PULSE
Pulse mode
TOGGLE
Toggle mode
RLC R=7500.0 Set up the resistance value
RLC L=0uH
Set up the inductance value
RLC C=10uF
Set up the capacitance value
EXIT
Exit the setup menu
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System Menu Press Shift + key to enter the System menu.
MENU INITIALIZE POWER ON SET BUZZER SET LOAD ON KNOB
TRIGGER SOUR.
TRIGGER TIMER COMMUNICATION
RS232 SET
INITIALIZE DEFAULT SET Resume all configuration to default settings
RST (DEFAULT)
Set the load’s input state to default at power on
SAV0
Set the load’s input state to SAV0 at power on
Set up the buzzer state
ON
Enable the function
OFF (DEFAULT)
Disable the function
Module knob mode setting
UPDATE (DEF)
Real-time update
OLD
No update (when turning load ON/OFF, original
value before use of rotary knob will be set)
Set up the trigger mode
MANUAL (DEF)
Manual trigger
EXTERNAL
External signal trigger mode
HOLD
Hold trigger mode
BUS
Bus trigger mode
TIMER
Timer trigger
Trigger timer setting
TRIGGER TIMER SET
Set the time of the trigger timer
Select the interface for remote communication
RS232 (DEF)
USBTMC-USB488
GPIB
ETHERNET
BAUDRATE SET
Set up the communication baud rate 4800 (DEFAULT) 9600 19200 38400 57600 115200
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RS232 SET
GPIB ADDRESS ETHERNET SET
EXPAND MODULE LANGUAGE SET ABOUT EXIT
PARITY SET
Set up the communication parity
NONE (DEFAULT)
ODD
EVEN
HANDSHAKE SET
Select the handshake protocol
NONE (DEFAULT)
CTS/RTS
XON/XOFF
GPIB address setting
GPIB ADDRESS SET
Set up communication address
Ethernet settings
GATEWAY SET
Gateway setting
IP SET
IP setting
MASK SET
Mask setting
PORT SET
Port setting
EXIT
Module expansion
ON
Enable the function
OFF (DEFAULT)
Disable the function
Communication protocol
SCPI (DEFAULT)
SCPI protocol
EXTEND TABLE
Expand SCPI protocol, compatible with others
Mainframe production information
MDL Mainframe production model number
SN: #########Mainframe production serial number
VER: 1.43
Mainframe software version
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Configuration Menu Press Shift + key to enter the channel Configuration menu.
MENU SYNC ON SET VON
AVERAGE COUNT V AUTORANGE PROTECT
LIST
Setup Synchronization ON / OFF function
ON (DEFAULT)
Turn on synchronization function
OFF
Turn off synchronization function
VON POINT VON LATCH
EXIT
Set the load’s Von point
Von latch state
ON (DEFAULT)
Turn on Von latch
OFF
Turn off Von latch
Exit the menu
Average count setting 2^X (adjustable from 2^2 to 2^16)
Auto switching voltage range
ON (DEFAULT)
Enable this function
OFF
Disable this function
Load protecting function
MAX POWER SET
Set up hardware power protection state
ALIMIT STATE
Set up software current protection state
Turn on software current ON
protection state
OFF (DEFAULT)
Turn off software current protection state
ALIMIT POINT
Set up software current protection value
ALIMIT DELAY
Set up software current protection delay
PLIMIT POINT
Set up software power protection value
PLIMIT DELAY
Set up software power protection delay
ON TIMER STATE
Set up LOAD ON timer state
ON TIMER SET
Set up LOAD ON timer time
EXIT
Exit the menu
FUNCTION MODE RECALL LIST
Select mode
FIXED
Choose fixed operation mode
LIST
Choose list operation mode
Recall list operation file
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EXT. CTRL SET REM SENSE SET ABOUT
EXIT
EDIT LIST
Edit list operation file
HIGH RANGE
Edit high range of list operation
LOW RANGE
Edit low range of list operation
External analog control function
ON
Turn on external analog control function
OFF (DEFAULT)
Turn off external analog control function
Remote sense function
ON
Enable remote sense function
OFF (DEFAULT)
Disable remote sense function
Module production information
MDL Channel production model
SN: Channel production serial number
#########VER: 1.35
Channel software version
Exit the menu
Automatic Test Menu Press Shift + key to enter the program menu.
PROGRAM RUN PROGRAM RECALL PROG EDIT PROGRAM EXIT
Run the testing file Recall the testing file Edit the testing file
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Installation
Inspection
This instrument was carefully inspected before shipment. Upon receipt, inspect
the instrument for damage that might have occurred during transit. If any sign
of damage is found, please notify your B&K Precision distributor. The
following standard and optional accessories are provided with each mainframe
or module. Mainframes include:
· Power cord · Mainframe extension cable accessory (MDL002 only) Modules
include: · Certificate of calibration Optional accessories: Rack mount kit
RK153 (available for mainframes MDL001 and MDL002)
Cleaning
Use a dry cloth or one slightly dampened with water to clean the external case
parts. Do not attempt to clean internally.
WARNING: To prevent electric shock, please unplug the power cord connected to
the unit before cleaning.
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Installing Modules
CAUTION : Static electricity may damage load modules. Please install modules
according to standard electrostatic prevention. Avoid touching joints and
circuit boards. One can install any combination of modules up to 2400 W total
in the MDL001 mainframe in any order. This also applies to the MDL002
mainframe extension, allowing a maximum of 4800 W total when connecting the
MDL001 and MDL002 together. The procedure of installing modules to the
mainframe extension is the same as that of the MDL001 mainframe. Installation
Procedure 1. Turn the mainframe off and disconnect the power cord. 2. Loosen
screws on front panel plastic cover and remove from mainframe.
Figure 3a – Module Installation
3. Remove plastic cover on rear with flat-blade screwdriver.
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Figure 3b – Module Installation
4. Insert and slide the selected modules into the slot.
Figure 3c – Module Installation
5. Insert and tighten module screws on rear panel.
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Figure 3d – Module Installation
6. Install more modules in other slots following the same process (steps 2
through 5). 7. Reconnect the power cord.
Channel Number
The channel number for all modules is determined by the location of the
modules in relation to the mainframe and ordered from right to left. With the
MDL001 mainframe, the total number of channels is 8. Channels 1 and 2 are next
to the mainframe front panel, while channels 7 and 8 are located on the left
side. Load channel number is fixed even if the location is unoccupied.
Dualchannel modules such as the MDL252 and MDL302 have two channels. If it is
a single-channel module, the channel number is automatically assigned the
first number of the slot. Figure 4 shows the default channel number order.
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Figure 4 – Channel Number Distribution
24
The following figures show examples of how channels are assigned when single-
channel and dualchannel modules are installed.
Figure 5 – Channel Number Order When Installing Four Single-Channel Modules
Figure 6 Channel Number Order When Installing Two Single-Channel Modules and
Two Dual-Channel Modules
Note : Mainframe extension module channels are numbered 11-18.
Location
The operating temperature of the MDL Series DC Electronic Load is 0 to 40 . A
fan cools the electronic load by drawing air through both the top and front,
and then exhausting it out the back. Therefore, the electronic load must be
installed in a location that allows sufficient space on the front and back of
the unit for adequate air circulation. Minimum clearances for bench operation
are 2 inches from the top and 3 inches from the front and back. If there are
radiator fans in your
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cabinet, please avoid installing the load near the fan, since it may limit air
circulation of the load. If you are installing equipment on top of your
electronic load in the cabinet, use a filler panel above the unit to ensure
adequate air circulation. The MDL Series can be placed in a standard 19-inch
rackmount shelf. Rack mount kit RK153 is available for use with mainframe
(MDL001) and mainframe extension (MDL002). When mounted, there is no need to
remove the bottom studs.
CAUTION: Do not block the fan exhaust at the rear of the load. When the load
is used on a bench, make sure there is enough space on the front and rear of
the equipment for air circulation.
Figure 7 – MDL001 and MDL002 Outline Diagram
The MDL002 mainframe extension has the same dimensions as the MDL001
mainframe. 26
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Figure 8 – Module Outline Diagram
Note : Dimensions are in millimeters (mm).
Input Voltage Selection
The electronic load can work under 110/220V±10% AC input, identified by an
input line voltage switch on the rear (refer to Figure 9). If the indicated
line voltage does not match your region, please use the switch in the back of
the unit to choose your input line voltage, install appropriate fuse (refer to
Table 1 – Fuse Table below), and then insert power cord.
CAUTION : Check to make sure correct fuse is installed when line voltage is
switched.
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Figure 9 Input Voltage Selection
Turn-On Checkout
When you turn on the electronic load, the front-panel display will light up
briefly while the electronic load performs its power-on self-test. The
following table shows the procedure of the self-test.
Mainframe VFD Display
BOIS Ver 1.20
SYSTEM SELF TEST
CH1/2/3/4/5/6/7/8
SCAN… 7531
e.g.CH01 CV OFF
Vdc=0.0000V Adc=0.0000A
Wdc=
0.00W
Description VFD displays software version System self-check
Detecting all installed modules
Displays information of channel 1 or the leftmost channel. Use up and down key
to select other channels.
WARNING: Your electronic load is equipped with a 3-wire grounding type power
cord; the third conductor being ground. The electronic load is grounded only
when the power-line cord is plugged into an appropriate receptacle. Do not
operate your power supply without adequate cabinet ground connection.
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If the Electronic Load Does Not Turn On
Use the following troubleshooting steps to help solve problems you might
encounter when turning on the instrument:
-
Verify that there is AC power to the electronic load. First, verify that the power cord is firmly plugged into the power receptacle on the rear panel of the electronic load. You should also make sure the power source you plugged the electronic load into is energized. Then check to see that the electronic load is turned on.
-
Verify the power line voltage setting. The line voltage is set to the proper value for your country (110VAC or 220VAC) when the electronic load is shipped from factory. Change the line voltage setting if it is not correct.
-
Verify that the correct power line fuse is installed. If fuse is blown, please replace it according to the following specification.
Table 1 – Fuse Table
Product Fuse specification (110VAC) Fuse specification (220VAC)
MDL001
T5A, 250V
T2.5A, 250V
MDL002
T5A, 250V
T2.5A, 250V
- Replace fuse. Use a flat-bladed screwdriver to open the small plastic cover under the AC input connector on the rear panel of the load and then replace with matching fuse.
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Figure 10 – Fuse Location
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Load Connection
WARNING : To satisfy safety requirements, load wires between the electronic
load and the device under test (DUT) should have a current rating high enough
not to overheat while carrying the short-circuit output current. Never make
connections between the electronic load and a DUT while the electronic load
inputs are turned ON and/or the DUT has live power at its output.
Before connecting the device to be measured to the electronic load, please
remove the cover on the output terminals of the load and cover it after
completing the connection. Please pay attention to the type, length, and
polarity when wiring. Avoid using wires of minimum specification of heating,
which are unable to supply good load regulation. Generally speaking, if the
wires are short enough, they can control a voltage drop of less than 0.5 V. In
addition, bonding them together can reduce induction and noise. Connect wire
from positive terminal of module to positive terminal of device. Similarly,
connect the corresponding negative terminal. Figure 11 illustrates a typical
connection of the module with the device to be measured.
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Figure 11 – Connection of Load and Device Under Test (DUT)
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There are two positive terminals and two negative terminals on the rear panel
of every module. Single terminal connection is adequate when the input current
is less than 30 A.
WARNING : Each terminal can carry up to 30 A current. Double-terminal
connection is needed when the input current is more than 30 A. Refer to Figure
11 – Connection of Load and Device Under Test (DUT) for double-terminal
connection.
Remote Sense Connection
If the lead length is relatively long, there will be a voltage drop in the
leads connected between load and measured object. Remote sensing can
compensate for this condition and provide better accuracy in your measurement.
Figure 12 illustrates a typical connection between module and device for
remote sense operation.
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Figure 12 – Remote Sense Connection
31
There are two input connectors. One is the electronic load’s input measurement
terminal and the other is the Vsense measurement terminal. When Vsense is
connected to device to be measured, the electronic load will switch to Vsense
mode automatically. There is no need to change a setting in the menu and the
front panel of the module will show “sense”.
CAUTION : The electric potential on the positive terminal of Vsense connector
must be higher than the negative terminal.
Parallel Connection
Parallel connection can be applied between modules of the same model to
increase current and power dissipation, but it cannot be applied between
different modules. Modules can be paralleled in CC, CR, or CW mode, but cannot
be paralleled in CV or CZ mode. Each module will dissipate the power it has
been programmed at. For example, after being paralleled, two single-channel
modules rated at 80V/40A/300W can dissipate up to 80V/80A/600W. Figure 13
illustrates the paralleled connection for increased power dissipation.
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Figure 13 – Parallel Module Connection
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Mainframe 8-pin Control Connector
The mainframe’s 8-pin control terminal on the rear panel is shown below. This
is used for external trigger and ON/OFF control connections.
Figure 14 Mainframe Rear Panel 8-pin Control Connector
Table 2 – Control Connector Pinout
Pin
Signal
Description
1
Trigger IN
Trigger Signal Input
2 Trigger OUT
Trigger Signal Output
3
ON/OFF IN
Synchronization ON/OFF Control Signal Input
4 ON/OFF OUT
Synchronization ON/OFF Signal Output
5
NC
No Connection
6
NC
No Connection
7
GND
Ground
8
GND
Ground
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External Trigger Connections
There are five kinds of trigger modes: 1) Front panel TRIG trigger mode 2)
Rear panel trigger mode 3) BUS trigger mode 4) Timer trigger mode 5) Hold
trigger mode
Setting these modes is done through the System menu (Shift + ) under <Trigger
Source>. Press Enter to confirm setting and Esc to exit menu.
Trigger Modes 1) To use front panel trigger mode, first set the trigger source
as MANUAL. Press Trig to start panel trigger mode.
2) To use rear panel trigger mode, first set the trigger source as EXTERNAL.
Inputting a TTL level pulse (>10 us) to the trigger signal input (pin 1) of
mainframe’s Mainframe 8-pin Control Connector on the rear panel will enable a
trigger operation. The following figure shows one way to produce a trigger
signal.
When making contact with a TTL pulse source, it produces a trigger to change
the setting value (voltage, current, resistance, etc.), e.g. switch in
transient mode, or create a pulse in dynamic pulse mode. At the same time, it
will output a trigger signal on pin 2.
3) To use BUS trigger mode, first set the trigger source as BUS. Connect the
electronic load by GPIB, USB, or Ethernet communication interface. When the
TRIG command is received, the load will produce a trigger signal.
4) To use timer trigger mode, first set the trigger source as TIMER. Set the
TRIGGER TIMER’s time, and the electronic load will trigger at specified
trigger timer setting and also produce a trigger signal on rear Trigger Out
pin.
5) To use hold trigger mode, first set trigger source as HOLD. Then send the
TRIG:IMM command to trigger the electronic load. Pin 2 of 8-pin Control
Connector on the rear will also output a corresponding trigger signal when the
electronic load receives the TRIG:IMM command.
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External ON/OFF Control Connection
ON/OFF IN (pin 3 of rear 8-pin Control Connector) is used to toggle the multi-
channel electronic load inputs ON or OFF. When ON/OFF IN pin receives a TTL
level pulse (>10us), the ON/OFF state of the load will toggle. SYNC ON SET
function can be set to ON for multiple channels to toggle more than one
channel at a time. ON/OFF OUT (pin 4 of rear 8-pin Control Connector)
indicates ON/OFF state of the multi-channel electronic load. If SYNC ON SET
function of any specific channel is set to ON and the channel’s input state is
ON, pin 4 outputs a low TTL level signal. If the input state is off, pin 4
outputs a high TTL level signal.
Mainframe Extension Connection
Figure 15 Mainframe Extension Connection
This interface is used to connect the mainframe extension to expand the number
of channels. Up to 16 total channels can be supported when mainframe is
connected to the mainframe extension. Procedure:
1. Use expansion cable to connect the mainframe extension interface between
the mainframe and mainframe extension.
2. Press Shift + to enter System menu. Use keys to navigate through menu. 3.
Select
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PC Control Connection
The MDL Series DC Electronic Load can achieve remote control via USB, RS-232,
LAN, or GPIB interface, but only one interface can be used at a time. Choose
the interface via the System menu (Shift + ). Connect communication cable
before powering on. Do not hot plug, as it may damage the communication
interface of the electronic load. The following procedure shows how to connect
the RS-232 cable between the electronic load and PC. Procedure:
1. Connect RS-232 cable. 2. Power on the electronic load. 3. Select channel
number via keys. 4. Enter System menu by pressing Shift + . Use keys to
navigate through menus. 5. Select
menu, you can set the values for baud rate, parity, and handshake using keys
and Enter key. See Menu List for full listing of menus and submenus applicable
to all other remote interfaces.
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Operation
Operating Modes
The electronic load can work in the following modes: 1) Constant current (CC)
operation mode 2) Constant voltage (CV) operation mode 3) Constant resistance
(CR) operation mode 4) Constant power (CW) operation mode 5) Constant
impedance (CZ) operation mode
Constant Current (CC) mode
In this mode, the electronic load will sink a current in accordance with the
programmed value regardless of the input voltage.
Figure 16 – Constant Current Mode
Ranges When working in CC mode, you can press the Setup key to enter the RANGE
menu. Two overlapping ranges can be selected: LOW RANGE or HIGH RANGE. Current
can be edited in either of the two ranges. Low range will supply higher
accuracy and better resolution when you set lower current. If any value you
set is outside the maximum value of the LOW RANGE, you should select HIGH
RANGE. If the electronic load is in remote control mode, you can use the
CURR:RANG command to switch current range.
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Vmax/Vmin Limits These parameters refer to the voltage high and low limit for
the automatic test mode. During automatic test mode, the device under test
(DUT) must be operating within the configured values for the test to PASS upon
completion. If the DUT operates outside the configured values, the test will
FAIL upon completion.
Note: These parameters are used for Automatic Test ONLY.
Immediate Current Value Set the current level via front panel or by sending
SCPI command CURR
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Figure 17 – Slew Rate Measurement
Between the 10% and 90% region, the slew rate can be measured by observing the
steepest slope portion. In case of very large load changes, e.g. from no load
to full load, the actual transition time will be larger than the expected
(measured) time. For this reason, the firmware allows the user to program slew
rate values outside of the specified slew rate ranges. The minimum transition
time for all programmable slew rates is also limited in cases where the
transition from one setting to another is very small, due to bandwidth
limitations of the load.
Constant Voltage (CV) Mode
In this mode, the electronic load will attempt to sink enough current to
control the source voltage to the programmed value.
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Figure 18 – Constant Voltage Mode
39
Ranges
When working in CV mode, you can press the Setup key to enter the RANGE menu.
Two overlapping ranges can be selected: LOW RANGE or HIGH RANGE. Voltage can
be edited in either of the two ranges. Low range will supply higher accuracy
and better resolution when you set lower current. If any value you set is
outside the maximum value of the LOW RANGE, you should select HIGH RANGE. If
the electronic load is in remote control mode, you can use the VOLT:RANG
command to switch voltage range.
Amax/Amin Limits These parameters refer to the current high and low limit for
the automatic test mode. During automatic test mode, the device under test
(DUT) must be operating within the configured values for the test to PASS upon
completion. If the DUT operates outside the configured values, the test will
FAIL upon completion.
Note: These parameters are used for Automatic Test ONLY.
Voltage Level Set the voltage level on front panel or by sending SCPI command
VOLT
Transient Voltage Level A/B transient voltage level can be set on front panel
or by remote operation. The electronic load can continuously toggle between
the two levels when transient operation is turned on.
Constant Resistance (CR) Mode
In this mode, the electronic load is equivalent to a constant resistance, as
shown below. The electronic load will linearly change the current, according
to the input voltage.
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Figure 19 – Constant Resistance Mode
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Ranges
When working in CR mode, you can press the Setup key to enter the RANGE menu.
Two overlapping ranges can be selected: LOW RANGE or HIGH RANGE. Resistance
can be edited in either of the two ranges. Low range will supply higher
accuracy and better resolution when you set lower resistance. If any value you
set is outside the maximum value of the LOW RANGE, you should select HIGH
RANGE. If the electronic load is in remote control mode, you can use the
RES:RANG command to switch resistance range.
Vmax/Vmin Limits These parameters refer to the voltage high and low limit for
the automatic test mode. During automatic test mode, the device under test
(DUT) must be operating within the configured values for the test to PASS upon
completion. If the DUT operates outside the configured values, the test will
FAIL upon completion.
Note: These parameters are used for Automatic Test ONLY.
Immediate Resistance Level Set the resistance level via front panel or by
sending SCPI command RES
Transient Resistance Level A/B transient resistance level can be set on front
panel or by remote operation. The load can continuously toggle between the two
levels when transient operation is turned on.
Constant Power (CW) Mode
In this mode, the electronic load will consume a constant power. When input
voltage increases, the input current will decrease, while power (P = V*I) will
remain the same.
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Figure 20 – Constant Power Mode
41
Ranges When working in CW mode, you can press the Setup key to enter the RANGE
menu. Two overlapping ranges can be selected: LOW RANGE or HIGH RANGE. Power
can be edited in either of the two ranges. Low range will supply higher
accuracy and better resolution when you set lower power. If any value you set
is outside the maximum value of the LOW RANGE, you should select HIGH RANGE.
If the electronic load is in remote control mode, you can use the POW:RANG
command to switch power range.
Vmax/Vmin Limits These parameters refer to the voltage high and low limit for
the automatic test mode. During automatic test mode, the device under test
(DUT) must be operating within the configured values for the test to PASS upon
completion. If the DUT operates outside the configured values, the test will
FAIL upon completion.
Note: These parameters are used for Automatic Test ONLY.
Immediate power level Set the power level via the front panel. If the load is
in CW mode, the new power level setting immediately changes the input. If the
load is not in CW mode, the power level setting will be saved for use until
mode is switched to CW mode.
Transient power level A/B transient power level can be set via the front panel
or by remote operation. The electronic load can continuously toggle between
the two levels when transient operation is turned on.
Constant Impedance (CZ) Mode
In this mode, the electronic load uses an A/D converter to sample and a built-
in DSP calculation to simulate the transient current wave of the tested
components. Circuit principle is as follows:
Ls
Rs
Is
VS
CL
RL
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Figure 21 – Constant Impedance Mode
42
Ranges When working in CZ mode, you can press the Setup key to enter the RANGE
menu. Two overlapping ranges can be selected: LOW RANGE or HIGH RANGE.
Impedance can be edited in either of the two ranges. Low range will supply
higher accuracy and better resolution when you set lower impedance. If any
value you set is outside the maximum value of the LOW RANGE, you should select
HIGH RANGE. If the electronic load is in remote control mode, you can use the
IMP:RANG command to switch impedance range.
Vmax/Vmin Limits These parameters refer to the voltage high and low limit for
the automatic test mode. During automatic test mode, the device under test
(DUT) must be operating within the configured values for the test to PASS upon
completion. If the DUT operates outside the configured values, the test will
FAIL upon completion.
Note: These parameters are used for Automatic Test ONLY.
Immediate Impedance level Set the impedance level via the front panel. If the
load is in CZ mode, the new impedance level setting immediately changes the
input. If the load is not in CZ mode, the impedance level setting will be
saved for use until mode is switched to CZ mode. You should select the channel
to be edited before setting impedance parameters. Press the SETUP button to
enter CZ mode. After choosing the high-low range, the front panel will display
the following:
Rset: set the impedance value (RL) Vmax: set maximum voltage pass/fail limit
for Automatic test mode Vmin: set minimum voltage pass/fail limit for
Automatic test mode RLC R: set the series resistance value (Rs) RLC L: set the
series inductance value (Ls) RLC C: set the parallel capacitance value (CL)
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Setting CV, CC, CR, CW, CZ Mode
The following procedure will show you a basic example of how to set up your
operation mode from the front panel.
Panel Operations 1. Power on the electronic load. 2. Press keys to select the channel to be edited, such as channel 1.
VFD Display Self-test CH01 CC OFF
Vdc=0.0000V
Adc=0.0000A
Wdc=0.00W
3. Press Setup key to enter the channel setup menu, press Enter key to CH01
enter the
CW, or CZ mode. Press Enter key to confirm.
RANGE=HIGH
Iset=9.000A
4. Press key to select
LOW RANGE
5. Press key to select the voltage setting
resistance setting
Enter key to confirm.
Set= 1.25A
6. Press key to select the rise slope setting <>. Input value and press CH01
Enter key to confirm. (CC mode only)
Rise Speed Set
= 1.00A/Us
7. Press key to select the fall slope setting <>. Input value and press CH01
Enter key to confirm. (CC mode only)
Fall Speed Set
= 2.00A/Us
8. Press Esc key to exit.
9. Press On/Off key to turn on the load’s input.
CH1 CC ON Vdc=0.0000V Adc=0.0000A Wdc=0.00W
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Local Operation
Mainframe Panel
The front panel keys are effective only in the local mode. When the load is
powered on, it works in local mode automatically (unless any of the remote
interfaces are connected to a device controlling it) and then you can select
channel number and set parameters such as voltage or current via the front
panel keys. When the load is repowered on, the mainframe will scan all the
installed modules once again, and can recall the parameters from the last time
it was powered off.
Figure 22 – MDL001 Mainframe Front Panel
1. VFD DISPLAY When powering on, the VFD screen will light up and show the
instrument’s firmware version. Then the system will begin power-on self-test,
check all the installed modules of the load, and display every channel’s
number, voltage, and current measurements.
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2. FUNCTION KEYS
Key Description
Chan
This key is used to switch channels. Every module has its own channel number and can be selected from the mainframe panel.
Save
This key is used to save parameters. After selecting a channel and editing its parameters, press the Save key to save your settings into non-volatile memory. Up to 101 groups of parameters can be saved.
Recall This key can be used to quickly recall a saved group of parameters from memory.
Setup
This key is used to enter the specific channel’s menu. For example, pressing this key allows you to set up A/B transient mode and CC/CV/CR/CW/CZ mode. For more details, view the Menu List section.
On/Off This key is used to turn the module’s input state on or off. When the
synchronization function
in the channel menu is enabled, pressing this key can control the on/off state
of all channels.
Trig This key is used to trigger the electronic load. Select the Manual
Trigger mode to use front
panel triggering.
Start This key is used to start an automatic test.
Pause
This key is used to pause an automatic test. The VFD will display pausing at each step. Press the key again to test the file continuously.
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3. ENTRY/SHIFT KEYS
Key
Esc
Description These are number input keys. This key can be used to exit any working state.
This key is used for decimal.
These keys are used to move up and down the menu selection.
Enter This key is used to confirm selection.
Shift This key is used to enter other menus and functions.
Shift + Press this key combination to enter the System menu.
(System)
Shift + Press this key combination to enter the Configuration menu.
(Config)
Shift + Press this key combination to enter the Program menu.
(Program)
Shift +
(Local)
Shift +
(Lock)
Press this key to switch the electronic load to local mode when in remote sense mode. Press this key to lock the module’s panel keys and knob. Repress the button to unlock.
4. POWER SWITCH This switch turns the electronic load on or off.
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Module Panel
Figure 23 – Module Front Panel
1. VFD DISPLAY Bright VFD display shows module`s operating mode.
2. ROTARY KNOB Used to change parameter values.
3. PANEL KEYS
Key
Description
A/B (single channel modules)
Switch A/B transient preset value.
L/R
Switch the left/right channels. Press this key + rotary knob to control
(dual-channel modules) the two channels.
Short
Used for short testing. This allows the load to simulate a short circuit at the input.
Mode
Switches the operating mode (CC, CR, CV, CW, or CZ).
Move the cursor position. Press key to move the cursor to the position
you want to edit, and then use the rotary knob to adjust value.
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Tran On/Off
Selects the transient mode. Press this key first to enable transient mode
before running A/B transient operation and then send the triggering signal to
run a program.
Control module’s input on/off state
4. AIR INLET Module’s air inlet for cooling purposes.
WARNING : Do not place any objects that may block or cover air inlet.
Module Panel Lock
Press Shift + key to lock current channel’s keys and knob operation. To
unlock, press Shift +
key again.
Switching Channels
There are three ways to switch channels: 1) Press Chan + number key 2) Press
Chan + key 3) Press the number key of the channel in SETUP menu
Channel Synchronization
If you want to change the synchronization of the channels, you can set this in
the Configuration menu. Switch to the channel on the mainframe and then press
Shift + key to enter the Configuration menu. Select and enter the <SYNC ON
SET> submenu. Select
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VFD Indicator Function Description
The detailed illustration of the VFD and all indicator functions are as
follows:
Figure 24 – Load Module VFD Panel
L/R is the indicator of the dual-channel module’s left/right channel. If you
want to edit left/right channel parameters, first select the channel using the
L/R key. Single-channel module will always display R. OFF indicates that the
module input is off. When module input is enabled, OFF indicator will turn
off. CC/CV/CR/CW/CZ indicates the module’s operating mode. VFD display screen
shows four lines of numbers. The first line shows the measured voltage value.
The second line shows the measured current value. The third line shows the
measured circuit’s power value. The fourth line shows the setup value, and
users can set A/V/ value here. Short is displayed when short circuit function
is enabled on the module. Tran is displayed when TRANSIENT mode is enabled on
the module. List is displayed when selecting LIST mode in the Configuration
menu. Sense is enabled in remote sense function. There is no need to set this
in the menu, as you only need to link the circuit to remote sense terminals
and `Sense’ will be displayed.
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Transient Operation
Transient operation enables the module to periodically switch between two load
levels, as might be required for testing power supplies. Transient operation
can be turned on and off from the front panel (Tran and Trig keys). Before you
turn on the operation, you should set the parameters associated with the
transient operation. The parameters include: A level, A width, B level, B
width, and transient testing modes. There are three different transient
testing modes: continuous, pulse, and toggle.
Continuous Generates a respective pulse stream that toggles between two load levels.
Pulse Generates a load change that returns to its original state after some time period.
Toggle
Generates a repetitive pulse stream that toggles between two load levels. It is similar to continuous mode except that the transient points are controlled by explicit triggers instead of an internal transient generator.
Continuous
In this mode, the electronic load generates a repetitive pulse stream that
toggles between two load levels. Load could switch the state between two value
settings, value A and value B.
In CC mode, transient testing can be used to check the stability of the source
voltage. Transient functions have two current levels (A level, B level), which
should be in the same range (high range or low range). You can set the A/B
level delay time and the rise/fall slew rate via the mainframe keypad.
The slew rate determines the rate at which the level changes. Press Trig key,
and the load will continuously switch between the A/B levels preset. Transient
loads are usually used to test the power supply’s performance under continuous
changing load conditions. Figure 25 shows the current waveform of continuous
transient operation mode.
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Figure 25 – Continuous Transient Operation Current Waveform
Pulse
In this mode, the electronic load generates a transient pulse of programmable
width when pulse transient operation is in effect.
In pulse mode, you can set A/B level, A/B width, and A/B slew rate via the
mainframe keypad. The electronic load will automatically switch to A level
after maintaining A width time. Then it will switch to B level. The electronic
load will not switch to A level again until the instrument receives the pulse
signal. The following figure shows the current waveform in pulse transient
operation.
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Figure 26 – Pulse Transient Operation
52
Toggle
In toggle mode, the electronic load will switch between A level and B level
when receiving a trigger signal after the transient operation is enabled. The
following picture shows the current waveform in toggle transient operation.
Figure 27 – Toggle Transient Operation
Setting Up A/B Transient Operation
The following is a short tutorial of how to set up A/B transient operation for
your electronic load. In this example, we will set up rise speed at 1 A/us and
fall speed at 2 A/us. The electronic load will be in continuous transient mode
and switch between 10 A and 2 A in durations of 0.002 s and 0.003 s
respectively. Note : When setting up steps, make sure all transient level,
slew, and width parameters are within the modules’ specified limits.
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A/B Transient Operation Tutorial
Panel Operations
VFD Display
1. Power on the electronic load.
Self-test
2. Press keys to select the channel to be edited. In this example, we select
channel 1.
3. Press Setup to enter the channel setup menu. Select
CH01 CC OFF Vdc = 0.0000V Adc = 0.0000A Wdc = 0.00W
CH01 Mode=CC RANGE=HIGH Iset=9.000A
4. Press key to select
CH01 HIGH RANGE LOW RANGE
5. Press key to select the rise slope setting <> and press Enter. For 1A/us, input 1 and press Enter to confirm.
CH01 Rise Speed Set = 1.00A/Us
6. Press key to select the fall slope setting <> and press Enter. For 2A/us, input 2 and press Enter to confirm.
CH01 Fall Speed Set = 2.00A/Us
7. Press key to select A level setting
8. Press key to select A width setting
CH01 Transition A Level = 10.00A CH01 Tran. A Width = 0.002S
9. Press key to select B level setting
CH01 Transition B Level = 2.00A
10. Press key to select B width setting
CH01 Tran. B Width = 0.003S
11. Press key to select transient operation mode
CH01 Continuous Pulse Toggle
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12. Press Esc key to exit.
13. Press Shift + to enter System menu. Press key to select
CH01 CC OFF Vdc = 0.0000V Adc = 0.0000A Wdc = 0.00W
MANUAL EXTERNAL HOLD BUS TIMER
14. Press Esc key to exit.
CH01 CC OFF Vdc = 0.0000V Adc = 0.0000A Wdc = 0.00W
15. Press On/Off key to turn on the electronic load’s input.
CH01 CC ON Vdc = 0.0000V Adc = 0.0000A Wdc = 0.00W
16. Press Tran key on channel 1 module to enable transient operation. 17. Press Trig key on mainframe panel to trigger transient operation.
Transient Operation Programming Example If in remote control mode, you can use
the following example commands for transient operation (refer to MDL Series
Programming Guide for more information).
CURRent:TRANsient:MODE CONTinuous CURRent:TRANsient:ALEVel 10
CURRent:TRANsient:AWIDth 0.2ms CURRent:TRANsient:BLEVel 2
CURRent:TRANsient:BWIDth 0.3ms TRANsient ON TRIGger:IMMediate
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List Operation
List mode lets you generate complex sequences of input changes on a single
channel with rapid, precise timing, which may be synchronized with internal or
external signals. This is useful when running test sequences with a minimum
amount of overhead.
The parameters of List operation include the name, number of steps (2-84),
step width time (20us3600s), and every steps’ set value and slew rate. The
list file can be saved in non-volatile memory where it can be quickly
recalled. Users can edit up to 7 groups of List files in CC mode only.
In List operation mode, the electronic load begins to enable the List
operation when it receives the trigger signal and will continue until the List
operation is completed or the instrument receives another trigger signal.
List Sequence
Figure 28 – List Mode Current Waveform
Setting Up List Operation Mode The following is a quick tutorial of how to set up List Mode for your electronic load.
Panel Operations 1. Power on the electronic load.
VFD Display Self-test
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2. Press keys to select the channel to be edited.
CH01 CC ON Vdc=0.0000V Adc=0.0000A Wdc=0.00W
3. Press Shift + to enter System menu. Press key to select
MANUAL EXTERNAL HOLD BUS TIMER
4. If electronic load is on, press On/Off key to turn off the electronic
load’s input.
5. Press Shift + to enter Configuration menu. Press key to select and
press Enter. Press key to select
6. Press key to select high range or low range and press Enter to confirm.
CH01 CC OFF Vdc=0.0000V Adc=0.0000A Wdc=0.00W
FUNCTION MODE RECALL LIST EDIT LIST EXIT
High Range Low Range
List file step
7. Input number of steps in List. Input value and press Enter to confirm.
=
5
8. Set first step’s current level. Input value and press Enter key to confirm.
Step 001 level
=
1A
Step 001 rate
9. Set first step’s slew rate. Input value and press Enter key to confirm. =
0.5A/us
10. Set first step’s width time. Input value and press Enter key to confirm.
Step 001 width
=
6S
11. Set second step’s current level. Input value and press Enter key to confirm.
Step 002 level
=
2A
12. Set second step’s slew rate. Input value and press Enter key to confirm.
Step 002 rate
=
0.1A/us
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13. Set second step’s width time. Input value and press Enter key to confirm.
Step 002 width
=
5S
14. Set parameters for steps 3 through 5 in the same manner described above.
15. Set number of run cycles. Input value and press Enter to confirm.
Repeat Count
=
1
CH01
16. Select memory position to save list file. Input value and press Enter
Save list file
to confirm.
=
1
17. Press key to select and
press Enter to confirm.
Fixed List
18. Press Esc key twice to exit menus. 19. Press On/Off key to turn on the electronic load’s input. 20. Press Trig key to trigger List mode operation.
CH01 CC ON Vdc = 0.0000V Adc = 0.0000A Wdc = 0.00W
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List Mode Programming Example If in remote control mode, you can refer to the following example to edit List operation (refer to MDL Series Programming Guide for more information).
Command LIST:RANGe 40 LIST:COUNT 10000 LIST:STEP 2 LIST:LEVEL 1,5 LIST:SLEW 1,2 LIST:WIDTH 1,1 LIST:LEVEL 2,1 LIST:SLEW 2,2 LIST:WIDTH 2,2 LIST:SAV 2 LIST:RCL 2 FUNCTION:MODE LIST TRIG:SOUR BUS *TRG
Function Sets List range Sets List cycle Sets List steps Sets List step 1 level Sets List step 1 slew rate Sets List step 1 width Sets List step 2 level Sets List step 2 slew rate Sets List step 2 width Saves List to file 2 Recalls List file 2 Sets List mode function Sets trigger source Runs List file
Note : This example programs a list on a MDL200 module. For other models, make sure all range, level, slew, and transient width parameters are within the modules’ specified limits.
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Triggered Operation
Trigger Function
Trigger operation can be used in the following operations: transient pulse
output, triggered output, and list output. The electronic load has five kinds
of trigger modes to synchronously trigger the tested instrument. Before
enabling the trigger function, users should first select trigger source.
Trigger Source
- Manual trigger: When manual trigger mode is active, pressing the Trig key on the front panel will enable a trigger operation.
- External trigger signal (TTL level): The 1st pin of the 8-pin connector on the rear panel of the mainframe is the trigger input terminal. When an external trigger signal is available, input a low pulse (>10us) to the input and the load will enable a trigger operation.
- Hold trigger: When hold trigger is used, the load will enable a trigger operation only when the load receives the TRIG:IMM trigger command from the communication port.
- Bus trigger: When bus trigger is set, the load will enable a trigger operation as soon as the load receives the trigger command GET or *TRG.
- Timer trigger: When timer trigger is set, the mainframe will enable a
trigger operation periodically.
Short Operation
The electronic load can simulate a short circuit at its input. During front panel operation, press the Short key to switch the short on/off state. Short operation will not affect the present setting. When turning off the short state, the load returns to the original set state.
The actual value of the electronic load in short operation depends on the mode and range that is active when the short is turned on. In CC or CR mode, the maximum short current is 120% of the current range. In CV mode, short means setting the load’s constant voltage to be 0 V. In short operation mode, you can measure the maximum short current (Amax) or DC current (ADC) of the power source to be measured. You can set this function via the Configuration menu. When in remote control mode, you can send SCPI command INPut:SHORt ON to enable the short operation.
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Input On/Off Operation
During front panel operation, press the On/Off key to switch the input on/off
state. Input On/Off operation will not affect the present settings. The
load/unload speed of On/Off operation is not dependent on the rise/fall slew
rate. When in remote control mode, you can send SCPI command “INPut ON” to
turn the input on (refer to MDL Series Programming Guide for more information
on remote commands).
Von Operation
The Von voltage value can be set to control the voltage turn on state for the
electronic load. When the input voltage exceeds the Von voltage value, the
electronic load’s input state turns on.
This function can protect a DUT when its voltage goes below a specified level.
For example, when testing a power supply’s discharge, you can set the voltage
level for the power supply to begin and end discharging.
There are two different modes of Von operation, set by the Von LATCH
parameter.
When Von LATCH is disabled, the electronic load will begin sinking current if
input voltage exceeds Von voltage. When the input voltage drops below the Von
voltage value, the electronic load will stop sinking current and the input
will turn off.
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Figure 29 – Von LATCH Load’s Working Range
61
When Von LATCH is enabled, the electronic load will begin sinking current if input voltage exceeds Von voltage. When the input voltage drops below the Von voltage value, the electronic load will still continue to sink current and the input remains on.
Figure 30 – Von LATCH Load’s Working Range
Setting Up Von Function
The following is a quick tutorial of how to set up the Von function for your electronic load. In this example, we will set the Channel 1 Von point to 5 V and enable Von latch.
Panel Operations
VFD Display
1. Power on the electronic load.
Self-test
2. Select channel to be set up. Press 1 for channel 1.
3. Press Shift + to enter Configuration menu. Press to select
CH01 CC OFF Vdc=0.0000V Adc=0.0000A Wdc=0.00W
Sync On Set Von Meter
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4. Select
5. Set the Von Point. Input 5 and press Enter to confirm. 6. Press to select
Von Point Von Latch Exit
Von Point Set
=
5V
On Off
When in remote control mode, you can send SCPI command “VOLT:ON
Save and Recall Operation
The stored settings of all channels can be recalled. The stored parameters
include operation mode, voltage/current values, slew rate, transient setting,
and more. Up to 101 groups of setting parameters can be saved. Group 0 can be
used for power-up settings. Groups 1 through 100 can be used for automatic
testing parameters. All parameters are saved into non-volatile memory and will
remain saved even in a powered down state.
To Save
Panel Operations
VFD Display
1. After setting up your parameters, press the Save key to save. It Save Group
will ask for the Save Group number.
0
Save Group 2. Input the Save Group number (0-100) and press Enter to confirm.
1
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To Recall
Panel Operations
VFD Display
1. To recall saved data, press the Recall key. It will ask for the Recall Recall Group
Group number.
0
2. Input the Group number (0-100) you previously saved your parameters to and press Enter key to recall.
Recall Group 9
Module Controlling Link
There is an 8-pin terminal and current monitoring connector on every module’s
rear panel.
Figure 31 – Terminals on Single-Channel Module Rear Panel
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Table 3 – Module Terminal Pinout
Pin Signal
1
GND
2
VF
3
DI
4
DO
I OUT
5 SENSE +
6 SENSE –
7 EXT_PRG+
8 EXT_PRG-
Description Ground
Voltage fault indication terminal Digital input terminal Digital output
terminal
Current monitoring output Voltage remote measuring terminal (+) Voltage remote
measuring terminal (-) External analog controlling terminal (+) External
analog controlling terminal (-)
Voltage Failure Indication When the electronic load is under OVP or reverse
protection condition, pin 2 (VF) will output a high level signal.
Current Monitoring The current monitoring terminal will output 0-10 V analog
signal accordingly to 0 – full range of the input current. You can connect an
external voltmeter or an oscilloscope to display the input current’s change.
Digital I/O Digital I/O is pin 3 and pin 4 shown in Figure 31 and only used in
remote control. The digital input terminal (pin 3) can detect a high/low level
signal. The digital output terminal (pin 4) can output a TTL high/low level
signal. It is a universal output terminal and can be used to control an
external instrument.
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Remote Sense Function When working in CC, CV, and CR mode, if the electronic
load consumes a very large current, it will cause a voltage drop in the leads
between the connected device and terminals of the electronic load. In order to
ensure testing accuracy, the electronic load provides a pair of remote sensing
terminals in the rear panel where users can sense the output terminal voltage
of the connected device. Users should set the electronic load in REMOTE SENSE
mode before using this function. On the rear terminals, SENSE (+) and SENSE
() are the remote sensing inputs. By eliminating the effect of the voltage
drop in the load leads, remote sensing provides greater accuracy by allowing
the electronic load to regulate directly at the source’s output terminals (see
Figure 12).
External Analog Control You can control the current setting of the electronic
load in CC mode using the external analog programming terminal, pin 7 and pin
8. A 0-10 V input signal will simulate 0 full scale of the electronic load
to regulate the input current of the electronic load (10 V indicates the full
range of electronic load’s current rating).
NOTE External analog control is designed to be used when the instrument is set
to High range (full range) only. If low range is used, the 0-10 V input signal
may not reflect the full scale input range of the load.
Automatic Test
The automatic test function of the MDL Series electronic load is useful for
simulating various tests and allows the user to edit up to 10 program files.
Each file has 10 steps and up to 100 steps can be edited and saved into the
EEPROM. Convenient for production environments, automatic test can cascade
sequences across multiple channels and allows setting of Pass/Fail (P/F)
criteria. Setting Up Test Files Configuring Pass/Fail Parameters
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The Pass/Fail criteria can be found in the SETUP menu of the front panel, under the Vmax/Vmin (CC/CR/CW/CZ mode) or Amax/Amin (CV mode) parameters. Users must set Pass/Fail criteria for each mode used in the Automatic test sequence before running the automated test.
Configuring Instrument Settings The automatic test runs a program that uses the settings stored into the internal EEPROM memory. Each program can run 10 sequences, and each of these sequences is correlated to instrument settings that are stored within a designated group of internal EEPROM memory. They are designated according to the table below:
Table 4 – Save Table
PROGRAM 1 Sequence Save Group PROGRAM 2 Sequence Save Group
PROGRAM 3
Save Group PROGRAM 4 Sequence Save Group PROGRAM 5 Sequence Save Group PROGRAM
6 Sequence Save Group PROGRAM 7 Sequence Save Group PROGRAM 8 Sequence Save
Group PROGRAM 9 Sequence
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
11 12 13 14 15 16 17 18 19 20
1
2
3
4
5
6
7
8
9
10
21 22 23 24 25 26 27 28 29 30
1
2
3
4
5
6
7
8
9
10
31 32 33 34 35 36 37 38 39 40
1
2
3
4
5
6
7
8
9
10
41 42 43 44 45 46 47 48 49 50
1
2
3
4
5
6
7
8
9
10
51 52 53 54 55 56 57 58 59 60
1
2
3
4
5
6
7
8
9
10
61 62 63 64 65 66 67 68 69 70
1
2
3
4
5
6
7
8
9
10
71 72 73 74 75 76 77 78 79 80
1
2
3
4
5
6
7
8
9
10
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Save Group
81 82 83 84 85 86 87 88 89 90
PROGRAM 10 1
2
3
4
5
6
7
8
9
10
Sequence
Save Group
91 92 93 94 95 96 97 98 99 100
The following is a step-by-step tutorial on how to set up a test file.
Panel Operations
VFD Display
1. Power on the electronic load.
Self-test
2. Select the channel you want to edit and then edit every group’s step. For this example, we will select channel 3 and channel 5 below. Press keys to switch channel to 3.
CH03 CC OFF Vdc=0.0000V Adc=0.0000A Wdc=0.00W
3. Press Setup key to enter the channel setup menu, press Enter key to enter
the
select the operating mode. Every step’s mode can be edited. Press Enter key to
confirm.
MODE= RANGE= Iset=
CC HIGH 1.00A
4. Press key to select
Const Current
Set=
1.000A
5. Press key to move the cursor to Vmax=82.000V and press Enter to set the upper limit of testing voltage. In this example, the first step is 5.8V. Press and then Enter to confirm.
Voltage Upper Limit= 5.800V
Press key to move the cursor to Vmin=0.000V and press Enter to set the lower limit of testing voltage. In this example, the first step is 0.15V. Press and then Enter to confirm.
Voltage Lower Limit= 0.150V
7. After editing the first step of channel 3, press Esc key to exit the menu.
8. Press keys to select channel 5. To edit the first step of channel 5, repeat steps 3 through 6 with desired parameters.
CH05 CC OFF Vdc=0.0000V Adc=0.0000A Wdc=0.00W
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9. After editing the first step of channel 5, press Esc key to exit the menu.
10. Save the edited first step of channel 3 and channel 5. Press Save Save Group
and to save step 1. Press Enter to confirm.
1
11. In the same manner, you can edit the rest of the steps for channel 3 and channel 5 by repeating steps 2 through 10 above. These saved groups correspond to sequences that will be selected in your program below.
12. Press Shift + key to enter the Program menu. Press key to select <Edit Program> and press Enter.
Run Program Recall Prog Edit Program Exit
13. The MDL Series with mainframe extension can support a maximum of 16 channels. 0 represents the MDL001 mainframe and 1 represents the MDL002 mainframe extension. 7531 indicates channels 1, 3, 5, and 7 have been equipped with electronic load modules.
Active Channel
0 : 7 5 3 1 1 :
14. Select the channels to be tested. For instance, if you want to select channels 3 and 5, press number keys 3 and 5. `Y’ denotes the channel is selected. If you want to cancel a channel, press the number key again to cancel. Then press Enter to confirm your selection.
Active Channel
0 : 7 5 3 1 1 :
15. Select the steps needed to test. For example, if you want to test 4 steps, press 1 2 3 4 (0 stands for the tenth step). If you want to cancel a step, press the number key again to cancel. Press Enter to confirm your selection.
Active SEQ. 0 9 8 7 6 5 Y Y Y Y
16. If you want to suspend a step, press the number key of the step. For example, to suspend step 2, press 2. Press the number key again to cancel. Then press Enter to confirm your selection.
Pause Sequence 4 3 Y 1
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17. To edit the first step of the 4 steps, determine whether you need short circuit testing on channel 3 and 5. For example, if channel 3 needs short circuit testing, input 3. Then press Enter to confirm your selection.
SEQ01 Short CH
0 : 5 Y 1 :
18. Set load on time (Ton). For example, if you need 2s, input 2 and SEQ01 On Time
then press Enter key to confirm.
=
2.0S
19. Set load off time (Toff). For example, if you need 2s, input 2 and SEQ01 Off Time
then press Enter key to confirm.
=
2.0S
20. Set test delay time (Tpf). For example, if you need 1s, input 1 and then press Enter key to confirm.
SEQ01 P/F Delay Time
=
1.0S
0 Tpf (Ton+ T off) Tpf is test delay time
21. Repeat steps 17 through 20 and set the rest of the steps’ load on/off time.
22. Set condition for when to stop testing. COMPLETE means to stop
test when all steps are completed. FAILURE means to stop test when testing
fails. Press keys to select condition and press Enter to confirm.
Stop Condition Complete Failure
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23. Program chain is used when you need to link to the next file to be tested. For example, if you need to link to group 2, press 2. If you do not need to link to another file, input and then press Enter key to confirm.
Program Chain NO: 2
24. Save the edited files into the EEPROM. Up to 10 program files can be saved. For instance, press 1 to save the edited file to program file 1 and then press Enter to confirm.
Save Program NO: 1
25. Press Esc key to exit menu.
Run Program Recall Prog Edit Program Exit
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Recall Test Files The following is a procedure on how to recall edited test files from the EEPROM.
Panel Operations
VFD Display
1. Press Shift + to enter the Program menu.
2. Press key to select
Run Program Recall Prog Edit Program Exit
Program Select NO: 1
3. To run the program, press key to select
Enter.
Result:
4. Press Start key to start automatic testing. If you need to pause, press Pause key and then press key to continue.
Remote Operation
There are four types of communication interfaces available: USB, Ethernet,
GPIB, and RS-232. You can choose any one of them to communicate with a PC.
Figure 32 Mainframe Rear Panel Communication Interfaces
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USB Interface Use Type A to Type B USB cables to connect the electronic load
and the PC. All electronic load functions are programmable over the USB. Press
Shift + on the front panel to enter the System menu. Select
The USB488 interface capabilities of the electronic load are described below:
· The interface is IEEE 488.2 standard USB488 interface. · The interface
accepts REN_CONTROL, GO_TO_LOCAL, and LOCAL_LOCKOUT requests. · The interface
accepts MsgID = TRIGGER USBTMC command message and forwards TRIGGER requests
to the function layer.
The USB488 device capabilities of the electronic load are described below: ·
The device understands all mandatory SCPI commands. · The device is SR1
capable. · The device is RL1 capable. · The device is DT1 capable.
Ethernet Interface Use a network cable to connect PC through Ethernet
interface of the electronic load. Press Shift + on the front panel to enter
the System menu. Select
RS-232 Interface
Use a cable with two COM interfaces (DB9) to connect the electronic load and
PC. It can be activated by selecting
NOTE : The RS-232 settings in your program must match the settings specified
in the front panel System menu. Press Shift + on the front panel to enter the
System menu if you need to change the settings.
RS-232 Data Format The RS-232 data is a 10-bit word with one start bit and one stop bit.
Parity=None
Start Bit
8 Data Bits
Stop Bit
The number of start and stop bits are not programmable. However, the following parameters are selectable in the System menu using the front panel Shift + key.
Baud Rate
The System menu lets you select one of the following baud rates, which are
stored in non-volatile memory: 4800, 9600, 19200, 38400, 57600, or 115200.
Parity
None – eight data bits without parity Even – seven data bits with even parity
Odd – seven data bits with odd parity
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RS-232 Flow Control The RS-232 interface supports the following flow control
options. For each case, the electronic load will send a maximum of five
characters after hold-off is asserted by the controller. The electronic load
is capable of receiving as many as fifteen additional characters after it
asserts hold-off.
· CTS/RTS: The electronic load asserts its Request to Send (RTS) line to
signal hold-off when its input buffer is almost full, and it interprets its
Clear to Send (CTS) line as a hold-off signal from the controller.
· XON/XOFF: When the input queue of the electronic load becomes more than ¾
full, the instrument issues an X-OFF command. The control program should
respond to this and stop sending characters until the electronic load issues
the X-ON, which it will do once its input buffer has dropped below half-full.
The electronic load recognizes X_ON and X_OFF sent from the controller. An
X-OFF will cause the electronic load to stop outputting characters until it
sees an X-ON.
· NONE: No flow control. Flow control options are stored in non-volatile
memory.
RS-232 Connections The RS-232 serial port can be connected to the serial port
of a controller (i.e., personal computer) using a straight-through RS-232
cable terminated with DB-9 connectors. Do not use a null modem cable. Figure
33 shows the pinout for the connector. If your computer uses a DB-25 connector
for the RS-232 interface, you will need a cable or adapter with a DB-25
connector on one end and a DB-9 connector on the other. It must be a
straightthrough (not null modem) cable.
Figure 33 – RS-232 Connector Pinout
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Pin
Signal
1
NC
2
TXD
3
RXD
4
NC
5
GND
6
NC
7
CTS
8
RTS
9
NC
Description No Connection Transmit Data Receive Data No Connection
Ground No Connection Clear to Send Ready to Send No Connection
RS-232 Troubleshooting
If you are having trouble communicating over the RS-232 interface, check the
following: · The computer and the electronic load must be configured for the
same baud rate, parity, number of data bits, and flow control options. Note
that the electronic load is configured for 1 start bit and 1 stop bit (these
values are fixed). · The correct interface cables or adapters must be used, as
described under the RS-232 connector. Note that even if the cable has the
proper connectors for your system, the internal wiring may be incorrect. · The
interface cable must be connected to the correct serial port on your computer
(COM1, COM2, etc.) and the correct 9-pin serial port on the mainframe.
Communication Setting
Before communicating, please make sure that the following parameters of the
electronic load match that of the PC. You can enter the System menu (Shift + )
to make any changes. Baud rate : 9600 (5800, 9600, 19200, 38400, 57600,
115200) Data bit : 8 Stop bit : 1 Parity : None (None, Even, Odd) Local
address : 0 (0 through 31, default setting is 0)
NOTE: When communicating with a PC, you can only use one communication interface at a time.
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Specifications
Model
MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600
Input Ratings
Input Voltage 0-80 V
0-80 V
0-80 V
0-500 V
0-80 V
0-500 V
0-80 V
Input Low Current High
Input Power
0-4 A 0-40 A 200 W
0-3 A 0-20 A 250 W 1
0-4.5 A 0-45 A 300 W
0-3 A 0-20 A 300 W
0-6 A 0-60 A 400 W
0-3 A 0-30 A 500 W
0-12 A 0-120 A 600 W
Channels
1
2
2
1
1
1
1
Minimum Low 0.10 V at 4 A 0.15 V at 3 A 0.14 V at 4.5 A 0.7 V at 3 A 0.15 V at
6 A 0.54 V at 3 A Operating Voltage High 1 V at 40 A 1 V at 20 A 1.4 V at 45 A
4.5 V at 20 A 1.5 V at 60 A 5.4 V at 30 A
CV Mode
0.18 V at 12 A 1.8 V at 120 A
Low Range
High 0-80 V
0-80 V
0-80 V
0-18 V 0-500 V
0-80 V
0-500 V
0-80 V
Low Resolution
High
Low Accuracy
High
±(0.05%+0.02% FS)
1 mV 10 mV ±(0.05%+0.025% FS) ±(0.05%+0.025%FS)
±(0.05%+0.02% FS)
CC Mode
Range Low High Low
Resolution High
0-4 A 0-40 A 0.1 mA
1 mA
0-3 A 0-20 A 0.1 mA
1 mA
0-4.5 A 0-45 A 0.1 mA
1 mA
0-3 A 0-20 A 0.1 mA
1 mA
0-6 A 0.001-60 A
0.1 mA
1 mA
0-3 A 0-30 A 1 mA
10 mA
0-12 A 0-120 A 0.1 mA
1 mA
Low Accuracy
High
±(0.05%+0.05%FS) ±(0.05%+0.05%FS)
±(0.05%+0.1%FS) ±(0.1%+0.1%FS)
CR Mode Range Low 0.05 -10 0.05 -10
High
0.05 -10
0.25 -10 0.05 -10 0.2 -10 10 -7.5 k
0.2 -10
Resolution
16 bit
Low Accuracy
High
0.01%+0.08 S 0.01%+0.0008 S
CW Mode
Range
200 W
250 W
300 W
300 W
400 W
500 W
600 W
Resolution
10 mW
Accuracy
±(0.2%+0.2%FS)
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Model
MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600
Transient Mode (CC mode) T1&T2 2
20us-3600s/Res:5us-10ms
Accuracy
5us+100ppm
Slew Rate 3
Low
0.0001-0.25 A/us
0.0001-0.2 A/us
0.0001-0.25 A/us
0.0001-0.1 A/us
0.0001-0.25 A/us
0.0001-0.1 A/us
0.0001-0.25 A/us
High 0.001-2.5 0.001-2 A/us 0.001-2.5 0.001-1 A/us 0.001-2.5 0.001-1 A/us 0.001-2.5 A/us
A/us
A/us
A/us
Accuracy
within 40% of programmed value
Measurement
Readback voltage
Low Range
High Low Resolution High
0-18 V 0-80 V 0.1 mV 1 mV
Accuracy Readback current
Low 0-4 A Range
High 0-40 A
Low 0.01 mA Resolution
High 0.1 mA
Low Accuracy
High
Readback power
Range
200 W
Resolution Accuracy
10 mW
Protection Range (typical)
OPP Low
OCP High
OVP OTP
200 W 4.4 A 44 A 82 V
General (typical)
Short Circuit
Current (CC) Low High
Voltage (CV) Resistance (CR)
4 A 40 A
25 m
0-18 V 0-80 V 0.1 mV 1 mV
0-3 A 0-20 A 0.01 mA 0.1 mA
250 W 10 mW
250 W 3.3 A 22 A 82 V
3 A 30 A 50 m
0-18 V
0-18 V
0-18 V
0-80 V
0-500 V
0-80 V
0.1 mV
1 mV
0.1 mV
1 mV
10 mV
1 mV
±(0.025%+0.025%FS)
0-4.5 A 0-45 A 0.01 mA 0.1 mA
0-3 A 0-20 A 0.01 mA 0.1 mA
±(0.05%+0.05%FS)
0-6 A 0-60 A 0.1 mA 1 mA
300 W 10 mW
300 W
400 W
10 mW
10 mW
±(0.2%+0.2%FS)
310 W 5 A 50 A 82 V
300 W 3.3 A 22 A 510 V
85
400 W 6.6 A 66 A 82 V
5 A 50 A
30 m
3 A 20 A
0 V 220 m
6 A 60 A
25 m
0-18 V 0-500 V
1 mV 10 mV
0-18 V 0-80 V 0.1 mV 1 mV
0-3 A 0-30 A 0.01 mA 0.1 mA
0-12 A 0-120 A 0.1 mA
1 mA ±(0.05%+0.1%FS) ±(0.1%+0.1%FS)
500 W 10 mW
600 W 10 mW
500 W 3.3 A 33 A 510 V
600 W 13.2 A 132 A 82 V
3 A 30 A
180 m
12 A 120 A
15 m
Input Terminal Impedance
300 k
300 k
300 k
1 M
300 k
1 M
300 k
Notes:
- MDL252: User can allocate up to 250 W to either channel up to 300 W total
(e.g. 50 W/250 W, 250 W/50 W, 150 W/150 W). 2) Fast pulse trains with large
transitions may not be achievable. 3) The slew rate specifications are not
warranted but are descriptions of typical performance. The actual transition
time is
defined as the time for the input to change from 10% to 90%, or vice versa, of the programmed current values. In case of very large load changes, e.g. from no load to full load, the actual transition time will be larger than the expected time. The load will automatically adjust the slew rate to fit within the range (high or low) that is closest to the programmed value.
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Supplementary Characteristics
Memory capacity 101 Groups
Recommended calibration period Once per year
AC Input (selectable by switch on the rear panel) Option 1: 220 V ±10%, 50/60 Hz Option 2: 110 V ±10%, 50/60 Hz
Cooling method Fan cool
Environmental conditions This instrument is intended for indoor use in a
pollution degree 2 environment. Environmental limits are as follows:
Operating temperature 0 to 40 °C
Storage temperature -10 to 60 °C
Humidity
Indoor use, 95%
Dimensions and weight Model MDL001
MDL002
MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600
Type Mainframe Mainframe Extension
Module Module Module Module Module Module Module
Dimensions (W x H x D) 445 x 183 x 549 mm
445 x 183 x 549 mm
82 x 183 x 573 mm 82 x 183 x 573 mm 82 x 183 x 573 mm 82 x 183 x 573 mm 82 x
183 x 573 mm 82 x 183 x 573 mm 82 x 183 x 573 mm
Weight 15.4 kg
15.4 kg
5 kg 5 kg 5 kg 5 kg 5 kg 5 kg 5 kg
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SERVICE INFORMATION
Warranty Service: Please go to the support and service section on our website
at www.bkprecision.com to obtain an RMA #. Return the product in the original
packaging with proof of purchase to the address below. Clearly state on the
RMA the performance problem and return any leads, probes, connectors and
accessories that you are using with the device. Non-Warranty Service: Please
go to the support and service section on our website at www.bkprecision.com to
obtain an RMA #. Return the product in the original packaging to the address
below. Clearly state on the RMA the performance problem and return any leads,
probes, connectors and accessories that you are using with the device.
Customers not on an open account must include payment in the form of a money
order or credit card. For the most current repair charges please refer to the
service and support section on our website. Return all merchandise to B&K
Precision Corp. with pre-paid shipping. The flat-rate repair charge for Non-
Warranty Service does not include return shipping. Return shipping to
locations in North America is included for Warranty Service. For overnight
shipments and non-North American shipping fees please contact B&K Precision
Corp.
B&K Precision Corp. 22820 Savi Ranch Parkway
Yorba Linda, CA 92887 www.bkprecision.com
714-921-9095
Include with the returned instrument your complete return shipping address,
contact name, phone number, and description of problem.
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LIMITED THREE-YEAR WARRANTY
B&K Precision Corp. warrants to the original purchaser that its products and
the component parts thereof will be free from defects in workmanship and
materials for a period of three years from date of purchase. B&K Precision
Corp. will, without charge, repair or replace, at its option, defective
product or component parts. Returned product must be accompanied by proof of
the purchase date in the form of a sales receipt. To help us better serve you,
please complete the warranty registration for your new instrument via our
website at www.bkprecision.com. Exclusions: This warranty does not apply in
the event of misuse or abuse of the product or as a result of unauthorized
alterations or repairs. The warranty is void if the serial number is altered,
defaced, or removed. B&K Precision Corp. shall not be liable for any
consequential damages, including without limitation damages resulting from
loss of use. Some states do not allow limitations of incidental or
consequential damages. So the above limitation or exclusion may not apply to
you. This warranty gives you specific rights and you may have other rights,
which vary from state-to-state.
B&K Precision Corp. 22820 Savi Ranch Parkway
Yorba Linda, CA 92887 www.bkprecision.com
714-921-9095
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22820 Savi Ranch Parkway Yorba Linda, CA 92887 www.bkprecision.com
© 2015-2016 B&K Precision Corp.
Printed in China
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v101016
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>