UNI-T 353199 Programmable DC Power Supply User Manual

UDP3305S Series
Programmable DC Power Supply
User Manual

Preface

Thank you for purchasing this brand new product. In order to use this product safely and correctly, please read this manual thoroughly, especially the safety notes.
After reading this manual, it is recommended to keep the manual at an easily accessible place, preferably close to the device, for future reference.

Limited Warranty and Liability

Uni-Trend guarantees that the product is free from any defect in material and workmanship within three years from the purchase date. This warranty does not apply to damages caused by accident, negligence, misuse, modification, contamination or improper handling. The dealer shall not be entitled to give any other warranty on behalf of Uni-Trend. If you need warranty service within the warranty period, please contact your seller directly. Uni-Trend will not be responsible for any special, indirect, incidental or subsequent damage or loss caused by using this device.

Copyright Information

Copyright is owned by Uni-Trend Technology (China) Co., Ltd.
UNI-T products are protected by patent rights in China and other countries, including issued and pending patents. Uni- Trend reserves the rights to any product specification and pricing changes.
Uni-Trend Technology (China) Co., Ltd. all rights reserved. Trend reserves all rights. Information in this manual supersedes all previously published versions. No part of this manual may be copied, extracted or translated by any means without the prior permission of Uni Trend.
UNI-T is the registered trademark of Uni Trend Technology (China) Co., Ltd.

Warranty Service

The instrument has a warranty period of one year from the date of purchase. If the instrument is damaged due to improper operation by the user during the warranty period, the maintenance fee and the costs caused by the maintenance shall be borne by the user, and the instrument shall be maintained by the company for life. If the original purchaser sells or transfers the product to a third party within one year from the date of purchase of the product, the warranty period of one year shall be from the date of the original purchase from UNI-T or an authorized UNl-T distributor. Power cords, accessories and fuses, etc. are not included in this warranty. If the product is proved to be defective within the warranty period, UNI-T reserves the rights to either repair the defective product without charging of parts and labor, or exchange the defected product to a working equivalent product (determined by UNI-T). Replacement parts, modules and products may be brand new, or perform at the same specifications as brand new products. All original parts, modules, or products which were defective become the property of UNI-T.
The “customer” refers to the individual or entity that is declared in the guarantee. In order to obtain the warranty service, “customer “must inform the defects within the applicable warranty period to UNI-T, and perform appropriate arrangements for the warranty service.
The customer shall be responsible for packing and shipping the defective products to the individual or entity that is declared in the guarantee. In order obtain the warranty service, customer must inform the defects within the applicable warranty period to UNI-T, and perform appropriate arrangements for the warranty service. The customer shall be responsible for packing and shipping the defective products to the designated maintenance center of UNI-T, pay the shipping cost, and provide a copy of the purchase receipt of the original purchaser. If the products is shipped domestically to the purchase receipt of the original purchaser. If the product is shipped to the location of the UNI-T service center, UNI-T shall pay the return shipping fee. If the product is sent to any other location, the customer shall be responsible for all shipping, duties, taxes, and any other expenses.
Limited Warranty and Liability
The warranty is inapplicable to any defects, failures or damages caused by accident, normal wear of components, use beyond specified scope or improper use of product, or improper or insufficient maintenance. UNI-T is not obliged to provide the services below as prescribed by the warranty:
a) Repair damage caused by installation, repair or maintenance of personnel other than service representatives of UNI-T;
b) Repair damage caused by improper use or connection to incompatible equipment;
c) Repair any damages or failures caused by using power source not provided by UNI-T;
d) Repair products that have been changed or integrated with other products (if such change or integration increases time or difficulty of repair).
The warranty is formulated by UNI-T for this product, replacing any other express or implied warranties. UNI-T and its distributors refuse to give any implied warranty for marketability or applicability for special purpose. For violation of the warranty, repair or replacement of defective products is the only and all remedial measure UNI-T provides for customers. No matter whether UNI-T and its distributors are informed of any possible indirect, special, occasional or inevitable damage in advance, they assume no responsibility for such damage.

Safety Information

Warning Danger:
To avoid electric shock and personal injury, please follow the following guidelines.
Disclaimer
Please read the following safety information carefully before using the instrument. UNI-T will not be liable for the personal injury and property losses caused by the user’s failure to comply with the following terms.
Correct connection of ground wire
To avoid electric shock, please use the provided cable to connect and make sure that the product is properly grounded before use.
Operating voltage
Please ensure that the main supply does not exceed 10% of rated operating range to prevent product damage.
Input voltage
Please notice the product symbols before connecting. The instrument supports 2 kinds of AC input method: 110V and 220V. Please check if the switch of load matches with the input power source and if the fuse is correctly installed.
Leads
Check whether the insulation layer of the test leads is damaged or whether the leads are exposed or conducting.
If the leads are damaged, replace them.
Fuses
Only fuses specified for this product are allowed.
Overvoltage protection
Please ensure that no excessive voltage (such as the voltage caused by lightning) reaches the product to avoid electric shock.
Do not open the housing of the product.
Do not operate the product when the instrument case is open. Do not alter the internal circuit of the instrument.
Do not touch live parts.
Do not touch exposed connectors, unused input terminals, or circuits being measured while the instrument is in use.
Please do not use the instrument in inflammable and explosive environment.
Do not use or store the instrument in high temperature, high humidity, flammable, explosive and strong magnetic field environments.

| Grounding
---|---
| Protective grounding
| Signal grounding
| Danger
| Power on
| Power off
| Ground terminal for chassis

Environment-Friendly Use Period (EFUP)
This product contains certain hazardous substances and can be used safely during its environmental-friendly use period (EFUP) of 40 years, as shown in the symbol on the left. If the specified time is exceeded, the product should be recovered.
Waste Electrical and Electronic Equipment (WEEE) Instruction 2002/96/EC
Do not dispose the product and its accessories in trash bin.

Product Overview

This chapter includes:
Product Series (Features and Specifications)
Front Panel
Rear Panel
3.11 Product Series

UDP3305S series programmable DC power supply includes two models: UDP3305S and UDP3305S-E. The output ranges are shown in the table below:

UDP3305S series is a high-performance programmable DC power supply with a clear interface, excellent performance indexes, multiple analysis functions and communication interfaces, which can meet diverse testing requirements.
1.1.1 Features
The maximum power can reach 373W, and the output of each channel is individually controllable.
Four-channel independent output: CH1/CH2: 0~30V/5A, CH3: 0~6V/3A, CH4: 5V/2A (USB)
Multi-protection: over voltage/over current/over temperature protection
CH1/CH2/CH3 independent output switch
Excellent load regulation and line regulation
Ultra-low output ripple and noise
Internal series and parallel connection output function
Voltage and current linear programmable functions
4.3″ TFT display, which can display multiple parameters and three-channel status at the same time
List mode/delayer, can control voltage and current output according to users’ needs
External trigger function to realize industrial automation control
USB Host, USB Device, LAN, RS232, Digital IO interfaces
With a waveform display function, the instrument can display the output voltage/current waveform in real time, and cooperate with the digital display of the voltage, current and power values, which is convenient for users to know the output status and trend of the instrument.
The instrument can automatically control the fan speed according to the operating conditions to reduce the noise.
Fan fault detection and alarm function
10 sets of settings to save and recall, supports U disk read and storage
Five-digit voltage/four-digit current high-precision display, resolution: 1mV/1mA
Key lock function to prevent accidental touch
Supports SCPI remote command control
1.1.2 Specifications

Technical indexes

Models| UDP3305S-E| UDP3305S
Output rating| Voltage| CH1&CH2：0～32V×2 CH3：0～6V
CH4：5V（USB output）| CH1&CH2：0～32V×2 CH3：0～6V
CH4：5V（USB output）
Current Power| CH1&CH2：0～5A×2 CH3：0～3A×1
CH4：2A（USB output 348W| CH1&CH2：0～5A×2 CH3：0～3A×1
CH4：2A（USB output 348W
Constant voltage mode| Regulation| Power supply regulation: ≤0.01%+2mV| Power supply regulation:
≤0.01%+2mV
Load regulation: ≤0.01%+2mV| Load regulation: ≤0.01%+2mV
Ripple and noise| ＜350μVrms/2mVpp(5Hz~1MHz)| ＜350μVrms/2mVpp(5Hz~1MHz)
Response time| ≤50μs(50% load variation, minimum load 0.5A)| ≤50μs(50% load variation, minimum load 0.5A)
| Command processing time| ＜100ms| ＜100ms
---|---|---|---
Output range| Adjustable continuously from 0 to rated voltage| Adjustable continuously from 0 to rated voltage
Constant current mode| Regulation| Power supply regulation: ≤0.01%+250μA| Power supply regulation: ≤0.01%+250μA
Load regulation: ≤0.01%+250μA| Load regulation: ≤0.01%+250μA
Ripple current| ≤2mArms| ≤2mArms
Output range| Adjustable continuously from 0 to rated current| Adjustable continuously from 0 to rated current
Tracking mode| Parallel connection| Power supply regulation: ≤0.01%+2mV| Power supply regulation: ≤0.01%+2mV
Load regulation: ≤0.01%+2mV| Load regulation: ≤0.01%+2mV
Series connection| Power supply regulation: ≤0.01%+3mV| Power supply regulation: ≤0.01%+3mV
Load regulation: ≤300mV| Load regulation: ≤300mV
Tracking error| ≤0.5%+10mV（10~30V no load）
≤0.5%+30mV（0~9.99V no load）
Connected load ≤300mV| ≤0.5%+10mV（10~30V no load）
≤0.5%+30mV（0~9.99V no load）
Connected load ≤300mV
Measurement| Display| Voltage full scale, 4 digits display LCD| Voltage full scale, 5 digits display；LCD
Current full scale, 4 digits display； LCD| Current full scale, 4 digits display；LCD
Programming resolution| Voltage: 10mV| Voltage: 1mV
Current: 1mA| Current: 1mA
Read back resolution| Voltage: 10mV| Voltage: 1mV
Current: 1mA| Current: 1mA
Programming accuracy  25±5℃）| Voltage: ±（0.3%+20mV）| Voltage: ±（0.03%+10mV）
Current: ±（0.2%+5mA）| Current: ±（0.2%+5mA）
Read back accuracy （25±5℃）| Voltage: ±（0.1%+20mV）| Voltage: ±（0.03%+10mV）
Current: ±（0.15%+5mA）| Current: ±（0.15%+5mA）
Voltage programmed speed (1% of total variation range)| CH1| Rise: full load＜50ms; no-load＜ 30ms| Rise: full load＜50ms; no-load＜ 30ms
---|---|---|---
Fall: full load＜45ms; no-load＜ 400ms| Fall: full load＜45ms; no-load＜ 400ms
CH2| Rise: full load＜50ms; no-load＜ 30ms| Rise: full load＜50ms; no-load＜ 30ms
Fall: full load＜45ms; no-load＜ 400ms| Fall: full load＜45ms; no-load＜ 400ms
CH3| Rise: full load＜15ms; no-load＜ 13ms| Rise: full load＜15ms; no-load＜ 13ms
Fall: full load＜22ms; no-load＜ 100ms| Fall: full load＜22ms; no-load＜ 100ms
Temperature coefficient per℃| CH1| Voltage: 0.01%+5mV；Current: 0.01%+2mA| Voltage: 0.01%+5mV；Current: 0.01%+2mA
CH2| Voltage: 0.01%+5mV；Current: 0.01%+2mA| Voltage: 0.01%+5mV；Current: 0.01%+2mA
CH3| Voltage: 0.01%+2mV；Current: 0.01%+2mA| Voltage: 0.01%+2mV；Current: 0.01%+2mA
Channel 4 (USB output) indicator| Output voltage| 5V ±0.25V| 5V ±0.25V
Output current| 2A| 2A

3.12 Front Panel

1.2.1 Keys

connection
| Return to the system main interface
Multi-function buttons| According to the prompt at the bottom of the display, press to select the corresponding function

3.13 Rear Panel

Inspection and Installation

This chapter includes:
Packing List
Requirements for Power Supply
Operating Environment
Cleaning

3.11 Packing List
Before using the instrument:

1. Check whether the appearance of the product is damaged, scratched or has other defects;
2. Check whether the instrument accessories are missing according to the packing list.
   If it is damaged or the accessories are missing, please contact Uni-Trend Instrument Sales Department or the distributor immediately.

3.12 Requirements for Power Supply
UDP3305S series can only be used in following conditions:

AC110V input voltage: T8AL250V

• Three-core power cord is provided. Please make sure that the ground wire of three-phase socket is properly grounded before use.
• 250V/4A (5x20mm) fuse is selected and installed for the instrument (220V) with a spare fuse in the fuse case.
• When replacing the fuse, please remove the external power cord first, then open the fuse slot under the power interface, take out the old fuse and replace it with a new one, and install the fuse slot back after completion.
  Warning: Please do not use the damaged power cord.

3.13 Operating Environment
UDP3305S series can only be used in normal temperature and low condensing zone. The general environment requirements are listed as follows.

3.14 Cleaning
To avoid electric shock, please unplug the power cord before cleaning.
Clean the housing and the panel with a soft damp cloth, and make sure it is completely dry.
Note: Do not use solvents like alcohol and gasoline.

Preparation for Start-Up

This chapter includes:
Power on and Run
Output Terminals
User Interface
3.1 Power on and Run
Before connecting the power supply, make sure that the power supply voltage switch on the rear panel is consistent with the actual connected voltage, and the frequency is 50Hz or 60Hz.
Note: If the instrument is damaged due to the wrong power supply, it will not be covered by the product warranty.
Before plugging in the power cord, make sure that the power switch on the front panel is off.
Connect the power cord to the AC power input terminal and the three-hole AC power output terminal on the rear panel (AC power supply with grounding wire).
Warning: The three-hole power cord that comes with the instrument has an independent grounding terminal. The power supply used must be three-hole and grounded, otherwise, it may cause electric shock.
Press the power switch to power on the instrument.
3.2 Output Terminals

1. Each channel can be used as an independent channel.
2. When CH1 and CH2 are connected in series or in parallel, pay attention to the wiring method.
3. The green indicator of each channel indicates the constant voltage mode, and the red indicates the constant current mode.

3.3 User Interface
3.3.1 Layout
After turning on the instrument, it will enter the user interface, as shown in the figure below.

3.3.2 Explanation

protection setting values

Front Panel Operations

This chapter includes:
Constant Voltage Output
Constant Current Output
Power Supply Series and Parallel Connections
List Mode and Delayer
Advanced Functions
Display Setting
Store and Recall
System Settings

4.1 Constant Voltage Output
UDP3305S series power supply provides two output modes: constant voltage output (CV) and constant current output (CC). In CV mode, the output voltage equals the voltage setting value and the output current is determined by the load. In CC mode, the output current equals the current setting value and the output voltage is determined by the load (When the power supply setting limit current value is less than the current value consumed by the load, the power supply is in constant current mode).
This section introduces the operation method in constant voltage output mode.

Operation steps:

1. Press the power switch to power on the instrument.

2. Select the channel:
   Select the channel according to the voltage and current required by the load. Press the corresponding channel selection key; at this point, this channel and its output state are high-lighted on the screen.

3. Connect the load:
   Use thick wires to connect the load to the selected channel.

4. As shown in the figure below, connect the load with the channel output terminals of the corresponding channel at the front panel. Caution
   Pay attention to the polarity when connecting them to avoid damaging the instrument and the devices connected to the instrument.

5. Set the voltage and current:
   Method 1
   Press the “Voltage” or “Current” key, and the cursor will be displayed at the end of the voltage or current setting value.
   Press or to select the voltage digit to be adjusted, and rotate the knob to set the value of each digit.
   Method 2
   Press the “Voltage” or “Current” key, and the cursor will be displayed at the end of the voltage setting value. Input the desired voltage by using the numeric keys, and press to delete. The voltage can be set by pressing the corresponding key through the prompt unit V or mV at the bottom of the screen.

6. Set overvoltage and overcurrent protection:
   The method is the same as the voltage and current setting. After setting the values, press the “Overvoltage” or
   “Overcurrent” key to turn on/off the overvoltage and overcurrent protection.
   Note: ☑ means turning on the protection, and ☐ means turning off the protection.

7. Turn on the output:
   Press the key to turn on the output of the corresponding channel and the actual output voltage, output current, ON/OFF state, output power as well as the output mode (CV/CC) are high-lighted in the user interface.

8. Check the output mode:
   In constant voltage output mode, the output mode displayed should be “CV”; if “CC” is displayed, users can increase the current setting value properly and the power supply will switch to CV mode automatically.

4.2 Constant Current Output
Operation steps:

1. Press the power switch to power on the instrument.

2. Select the channel:
   Select the channel according to the voltage and current required by the load. Press the corresponding channel selection key; at this point, this channel and its output state are high-lighted on the screen.

3. Connect the load:
   Connect the load to the selected channel.

4. Set the voltage:
   It is the same as setting voltage in constant voltage mode.

5. Set the current:
   It is the same as setting current in constant voltage mode.

6. Set overvoltage and overcurrent protection:
   It is the same as setting overvoltage and overcurrent protection in constant voltage mode.

7. Turn on the output:
   Turn on the output of the corresponding channel and the actual output voltage, output current, output power as well as the output mode (CC) are high-lighted in the user interface.

8. Check the output mode:
   In constant current output mode, the output mode displayed should be “CC”; if “CV” is displayed, users can decrease the current setting value properly and the power supply will switch to CC mode automatically.

4.3 Power Supply Series and Parallel Connections
Higher voltages can be provided when two or more insulated channels (the channels can be from a single power supply or multiple power supplies) are connected in series. Higher currents can be provided when two or more insulated channels (the channels can be from a single power supply or multiple power supplies) are connected in parallel. UDP3305S series power supply’s series and parallel connections do not require external wiring. Press ” ” or ” ” to realize the connections, but it is limited to the series and parallel connections between CH1 and CH2. If users need to connect the UDP3305S series power supply in series and parallel with other power supply channels, they can only realize it through external wiring, as shown in the figure below, but pay attention to the following points.
Note:

1. Only insulated channels can be connected in series or in parallel.
2. In power supply series and parallel connections, the settings of the corresponding parameters must comply with the safety requirements.

Power Supply Series Connection
Higher voltages can be provided by connecting power supplies in series. In this case, the output voltage is the sum of the output voltages of all the channels. When the UDP3305S series power supply enters the series mode, users only need to set its output voltage, output current, and the overvoltage and overcurrent protection values.

Operation steps:

1. Press the power switch to power on the instrument.

2. Enter series mode:
   Press “ ”, and the screen will display that CH1 and CH2 enter the series mode. The key backlight lights up, and SER appears on the screen with a wiring diagram.

3. Connect the load:
   Connect the load according to the wiring diagram on the screen. Connect the positive pole of the load to the positive pole (red) of the CH1 output terminal, and connect the negative pole of the load to the negative pole (black) of the CH2 output terminal.

4. Set the voltage, current, overvoltage and overcurrent protection:
   Refer to chapter “Constant Voltage Output”. All the channels in series connection should be operating in constant voltage mode.

5. Turn on the output:
   Press the key of CH1or CH2 to enter the series connection output mode. At this time, the CH1 and CH2 output indicators are all green (CV mode). If the indicator is red, please check whether the set current meets the load requirements.

Power Supply Parallel Connection
High currents can be provided by connecting power supplies in parallel. In this case, the output current is the sum of the output currents of all the channels. When the UDP3305S series power supply enters the parallel mode, users only need to set its output voltage, output current, and the overvoltage and overcurrent protection values.

Operation steps:

1. Press the power switch to power on the instrument.

2. Enter parallel mode:
   Press “ ”, and the screen will display that CH1 and CH2 enter the parallel mode. The key backlight lights up, and PARA appears on the screen with a wiring diagram.

3. Connect the load:
   Connect the load according to the wiring diagram on the screen. Connect the positive pole of the load to the positive pole (red) of the CH1 output terminal, and connect the negative pole of the load to the negative pole (black) of the CH1 output terminal.

4. Set the voltage, current, overvoltage and overcurrent protection:
   Refer to chapter “Constant Voltage Output”. All the channels in parallel connection should be operating in constant voltage mode.

5. Turn on the output:
   Press the key of CH1 or CH2 to enter the parallel connection output mode. At this time, the CH1 and CH2 output indicators are green (CV mode) and red (parallel connection or CC mode) respectively. If the CH1 indicator is red too, please check whether the set current meets the load requirements.

4.4 List Mode (Timer) and Delayer
UDP3305S series power supply provides the timer and delayer functions.
When the timer is enabled, the instrument outputs the preset parameter groups (at most 2048 groups): voltage, current and timing time. Besides, users can define the parameter groups by calling the template that comes with the system.
When the delayer is enabled, he instrument outputs the preset parameter groups (at most 2048 groups): enable or disable output and delay time. Besides, users can define the parameter groups by calling the system’s automatic generation function.
The output parameters of the list mode and the delayer can be saved in the internal memory of the system. 10 groups can be stored each, and users can define the file name. Users can also store list mode parameters (list mode file, with the suffix “.LST”) and delayer parameters (delay file, with the suffix “.DLY “) in external memory. The number of external storage files is not limited by the system, only limited by the size of the external storage space.
Operation steps:

1. Press the power switch to power on the instrument.

2. Enter the timer/delayer mode:
   Press to step through the list mode and delayer setting interface.
   Note: For the same channel, the timer function and delayer function are mutually exclusive. When the timer is enabled, delayer is disabled. For different channels, they can be enabled or disabled at the same time.

3. Select the channel:
   In timer/delayer mode, CH1, CH2, CH3, series and parallel can be selected as output channels.
   When selecting CH1, CH2 or CH3, they can all work independently at the same time.
   When selecting series or parallel mode, it can work independently with CH3, but CH1 and CH2 channels cannot be used independently.

4. Connect the load:
   Connect the load according to the selected load. Refer to chapter “Power Supply Series and Parallel
   Connections” for the connection method.

5. Set list mode/delayer parameters:
   Refer to the following chapters “List Mode Parameter Setting” and “Delayer Parameter Setting”.

6. Turn on the output:
   Press of the corresponding channel to turn on the timing output.

List Mode Parameter Setting
The interface of list mode is as follows:

To set the list mode parameters manually:
Press “Basic parameter” key to enter the setting interface. Users can edit the starting group number, the required number of output groups (maximum 2048 groups), the number of cycles (maximum 99999 times) and the output status after the timing time expires. Set parameters for each group: Set voltage, current, and time parameters for each group based on the required number of output groups.
To set the list mode parameters using template:
Press “Template” to open the template editing menu.

1. Press “Type” to select the desired template;
2. Press “Edit object” to select “Voltage” or “Current”;
3. Define waveform start group values and total points;
4. Press “More” to set the waveform parameters such as the voltage, maximum and minimum current, high and low levels, pulse width, period and inversion;
5. Press “Construct” to complete the waveform output setting;
6. Press several times until the instrument returns to the initial interface of the list mode. Press the “Enable” key, the timing output function is set up.
   Note: Press to return to the previous menu.

Delayer Parameter Setting
The interface of delayer is as follows:

To set the delayer parameters manually:
Press “Basic parameter” key to enter the setting interface. Users can edit the starting group number, the required number of output groups (maximum 2048 groups), the number of cycles (maximum 99999 times), and conditions for terminating the output state and stopping the delayer. Set parameters for each group: Set voltage, current, and time parameters for each group based on the required number of output groups.
To set the list mode parameters using template:
Press “Auto generation” to open the template editing menu.

1. Press “Type” to select the desired template;
2. Press “Start group” to edit the start group number;
3. Press “Total points” to set the number of points required for this delay (maximum 2048 points);
4. Press “Mode” or “Time” to set parameters for each template. Press “Mode” to select 01 code (off/on cycle) or 10 code (on/off cycle). Press “Time” to edit time base value, step value, open time and close time, etc. (the menu varies according to different templates).
5. After all parameters are set, press “Generate” to complete the delayer template output setting.
6. Press “Enable”, the delayer will control the automatic output of the corresponding channel.
   Templates
   The list mode and delayer are equipped with multiple output templates. The purpose is to facilitate users to operate and save time. The following sections describe the parameters of each template.

4.5 List Mode Templates
The optional list mode templates include: sine, pulse, ramp, stair up, stair down, stair up down, exponential rise and exponential fall.

1. Sine
   The Sine waveform is as shown in the figure below.
   The instrument determines the Sine amplitude according to the maximum and minimum currently set and determines the Sine period according to the total number of points (maximum 2048) and the time interval (maximum 99999) currently set.
   After the waveform is constructed, set the number of cycles in the list mode interface to continuously output Sine waveforms. The output time is determined by the product of the period and the number of cycles.

2. Pulse
   The Pulse waveform is as shown in the figure below.
   The pulse width t determines the high level duration. The period T determines the Pulse duration. The low level time equals the period T minus the pulse width t (T-t).
   The high and low level values determine the maximum and minimum amplitudes of the pulse.

3. Ramp
   The Ramp waveform is as shown in the figure below.
   The difference between the set maximum and minimum values and the time interval (maximum 99999) will determine the slope of the Ramp waveform.
   Symmetry indicates the proportion of Ramp waveform rise time to the whole cycle. The ramp-down time is equal to the period minus the product of period and symmetry.

4. Stair Up
   The Stair Up waveform is as shown in the figure below.
   The instrument determines the amplitude of the Ramp according to the maximum and minimum currently set.
   The total number of points (N) will divide the amplitude into N-1 steps.
   The time interval (maximum 99999) indicates the duration of each step, and determines the waveform period together with the total number of points.

5. Stair Down
   The Stair Down waveform is as shown in the figure below.
   The instrument determines the amplitude of the Ramp according to the maximum and minimum currently set.
   The total number of points (N) will divide the amplitude into N-1 steps.
   The time interval (maximum 99999) indicates the duration of each step, and determines the waveform period together with the total number of points.

6. Stair Up Down
   The Stair Up Down waveform is as shown in the figure below.
   The instrument determines the amplitude of the Ramp according to the maximum and minimum currently set.
   The total number of points (N) will divide the amplitude into N-1 steps. When N is an odd, the number of ascending steps is (N-1)/2 and descending steps is (N-1)/2+1. When N is an even, the number of ascending steps is N/2 and descending steps is N/2.
   The time interval (maximum 99999) indicates the duration of each step, and determines the waveform period together with the total number of points.

7. Exponential Rise
   The Exponential Rise waveform is as shown in the figure below.
   The instrument determines the amplitude of the waveform according to the maximum (M) and minimum (N) currently set and determines the waveform period according to the total number of points (P) and the time interval (maximum 99999).
   The rise index (R) is the independent variable of the rise function, which is an integer from 0 to 10. It determines the rising speed of the waveform, and the base is Euler number (e=2.718281828).
   The waveform function is (X is the independent variable, an integer from 0 to P-1).

8. Exponential Fall
   The Exponential Fall waveform is as shown in the figure below.
   The instrument determines the amplitude of the waveform according to the maximum (M) and minimum (N) currently set and determines the waveform period according to the total number of points (P) and the time interval (maximum 99999).
   The fall index (R) is the independent variable of the fall function, which is an integer from 0 to 10. It determines the falling speed of the waveform, and the base is Euler number (e=2.718281828).
   The waveform function is (X is the independent variable, an integer from 0 to P-1).

4.6 Delayer Templates
The optional delayer templates include: state generation, fix time, increase, and decline.

1. State Generation
   The state generation mode is a template that controls the On/Off state of the output terminal. “0” means off and “1” means on. 0 1 Pattern: the state is set to “Off” and “On” alternately. 1 0 Pattern: the state is set to “On” and “Off” alternately.

2. Fix Time
   Fix time mode is a template for setting the output terminal on time (Max. 99999s) and off time (Max. 99999s).
   Users set the output on delay time (the duration when the output status is “On”) and the output off delay time (the duration when the output status is “Off”).
   The default initial state of the group data generated by this template is the output off state.

3. Increase
   Generate the on/off delay time by increasing from the time base value at the specified step (△t<99999s).
   Delay time of next state = delay time of current state + step value;
   The default initial state of the group data generated by this template is the output off state.

4. Decline
   Generate the on/off delay time by declining from the time base value at the specified step (△t<99999s).
   The default initial state of the group data generated by this template is the output off state.

4.7 Save and Read the Timer/Delay File
Users can store the timer/delay parameters edited manually or using the template in internal or external memory and recall them when required.
Save
The instrument can store 10 groups of setting values of the three functions of list mode, delayer and state file respectively, and also supports external storage.
Press to enter the state storage interface. The storage contents include the present setting values of voltage and current of each channel, overvoltage and overcurrent values, the setting values of triggers and monitors, upper computer connection baud rate and IP address, etc.:

After entering the list mode function, press “storage” to save/read.

After entering the delayer function, press “storage” to save/read.

Save and name files by using the knob. The suffix of a list mode file is .LST, and the suffix of a delayer file is .DLY.
The files can also be saved on an external storage medium, such as a U disk.
4.8 Read
Turn on the list mode/delayer function, and press “Storage” to enter the storage interface.
Press the knob to select the parameter group file to be recalled. After pressing the “Read” key, the screen displays “Load succeeded”.
Press the “ESC” key twice to return to the initial interface of list mode/delayer. Press the “Enable” key to read the stored files.

4.9 Waveform Display
UDP3305S series power supply has waveform display function, which can display the output voltage, current and power of each channel on the screen.
When each channel operates independently, voltage, current and power waveforms of three channels can be displayed on the screen at the same time. When CH1 and CH2 are in series/parallel mode, only the waveforms of CH3 and series/parallel channel can be displayed simultaneously. To view the output waveforms of the list mode and delayer, set and enable the list mode and delayer functions first, and then turn on the waveform display function.

Operation steps:

1. Press the power switch to power on the instrument.

2. Turn on the waveform display function:
   Press 3 to enter the waveform display interface.

3. Select the channel:
   Select the channel according to the load and connect the load (refer to chapter “Constant Voltage Output”, “Constant Current Output”, “Power Supply Series and Parallel Connections”), set the voltage, current, over voltage and over current protection values.
   For list mode and delayer waveforms, refer to chapter “List Mode (Timer) and Delayer”.

4. View the waveform:
   Turn on the selected output channel to view the waveform.
   To view the list mode and delayer waveforms, press again.

4.10 Preset
UDP3305S series power supply provides 5 sets of output presets that can be freely edited and stored. Users can set the voltage, current, limit voltage and limit current parameters of each channel and series and parallel channel in advance, and load the parameters when using, so as to avoid the step of resetting parameters every time when turning on the instrument.

Operation steps:

1. Press the power switch to power on the instrument.

2. Press to enter the preset interface.

3. Select a preset group:
   Rotate the knob or press or to switch between the preset groups.
   Press the Edit key or the knob to select a preset group and enter its editing interface.

4. Edit preset group parameters:
   In the editing interface, rotate the knob to select the channel. Then edit the voltage, current, overvoltage and overcurrent values of each channel by pressing the keys at the bottom of the screen.

5. Load preset group parameters:
   Press or press the knob twice to exit the editing interface. Press the “Load” key, the interface automatically jumps back to the power on interface, and the parameters of each channel are displayed as the preset parameter values.

4.11 Monitor
The monitor monitors the voltage, current and power of each independent channel, series and parallel channel, and gives alarm to the output of each channel and determines whether to close the output according to the set conditions.
Operating mechanism:
When the monitored voltage, current and power is greater than or less than the set value, control the output according to the combination (or/and) of current, voltage and power. The alarm and prompt can be set. Each independent channel can be monitored at the same time. In series and parallel mode, the independent channel will stop monitoring, and only the CH3 channel can be monitored synchronously.

Operation steps:

1. Press the power switch to power on the instrument.

2. Enter the monitor interface:
   Press , select “Monitor”, and then press the “Enter” key or the knob to enter the monitor setting interface.

3. Select the monitor channel and set the parameters:
   Select a channel and connect the load.
   Set the monitoring conditions: voltage, current and power; > or <; combination (or/and) of current, voltage and power.
   Set the monitor processing mode: output off, warning, beeper.

4. Turn on the monitor:
   Press the “Enable” key to turn on the monitor function.

4.12 Trigger
The trigger can be used as a trigger source to output high and low level signals to the external instrument, or as a source under control to trigger the on and off of the instrument output through the external input level.
When triggered by an external signal, the trigger operates in trigger input mode. When the digital I/O interface detects the trigger signal, the power supply controls the channel action. When the external instrument is triggered, the digital I/O interface outputs high or low level signals when the trigger conditions are met.
The digital I/O interface on the rear panel needs to be connected, and the high level of IO input should not be higher than 3.3V to avoid damage to the instrument.
Note: When the trigger operates in trigger input mode, D0~D3 is high level by default, and low level signal needs to be connected to trigger.

Operation steps:

1. Connect the digital I/O interface on the rear panel to the external trigger source.

2. Press the power switch to power on the instrument.

3. Enter the trigger interface:
   Press , select “Trigger”, and then press the “Enter” key or the knob to enter the trigger setting interface.

4. Select the trigger channel and set the parameters:
   Press “Data line” to select D0, D1, D2 or D3.
   Press “In/Out” to select trigger input or trigger output.
   Trigger Input
   Source under control: Press or to select one or more of CH1, CH2 and CH3 as the source under control. Press the knob to confirm.
   Trigger type: Press the “Left” or “Right” key and rotate the knob to select to trigger on the rising edge, falling edge, high level or low level of the input signal.
   Sensitivity: Users can set the sensitivity to high, middle or low.
   Response mode: Users can set the output response type to “Output on”, “Output off” or “Output toggle”.
   Trigger Output
   Control source: Press or to select any of CH1, CH2 and CH3 as the control source. Press the knob to confirm.
   Trigger condition: Rotate the knob to select and set the trigger condition.
   Polarity: Set the polarity of the trigger output signal to “Positive” or “Negative”.

5. Enable:
   Press Enable to enable the trigger function.

4.13 System Settings
In the system settings interface, users can view and modify system parameters, such as the IP address, baud rate of RS232 interface, current system software version, and screen brightness.

UNI-TREND TECHNOLOGY (CHINA) CO., LTD.
No.6, Gong Ye Bei 1st Road,
Songshan Lake National High-Tech Industrial
Development Zone, Dongguan City,
Guangdong Province, China

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| UNI-T 353199 Programmable DC Power Supply [pdf] User Manual
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