QJE QJ3003GIII Programmable DC laboratory DC Power Supply 0-30V with USB 2.0 Interface User Manual
- June 5, 2024
- QJE
Table of Contents
QJ3003GIII QJ3005GIII
Programmable DC laboratory DC Power Supply 0-30V with USB 2.0 Interface
QJ3003GIII QJ3005GIII
USER MANUAL
Introduction
To all residents of the European Union
Important environmental information about this product
This symbol on the device or the package indicates that disposal of the device
after its lifecycle could harm the environment. Do not dispose of the unit (or
batteries) as unsorted municipal waste; it should be taken to a specialized
company for recycling. This device should be returned to your distributor or
to a local recycling service. Respect the local environmental rules.
If in doubt, contact your local waste disposal authorities.
Thank you for choosing Velleman! Please read the manual thoroughly before
bringing this device into service. If the device was damaged in transit, don’t
install or use it and contact your dealer.
Safety Instructions
| Keep this device away from children and unauthorized users.
---|---
| Indoor use only. Keep this device away from rain, moisture, splashing,
and dripping liquids. Never put objects filled with liquids on top of or close
to the device.
| DO NOT disassemble or open the cover under any circumstances. Touching
live wires can cause life-threatening electroshocks. There are no user-
serviceable parts inside the device. Refer to an authorized dealer for service
and/or spare parts. Always connect the device to an earthed power socket.
**| Caution:** device heats up during use. Make sure the ventilation
openings are dear at all times. For sufficient air circulation, leave at least
1″ (±2.5 cm) in front of the openings. Place the device on a flat, heat-
resistant surface, do not place the device on carpets, fabrics…
| Always disconnect mains power when the device is not in use or when serving
or maintenance activities are performed. Handle the power cord by the plug
only.
| Keep this device away from dust and extreme temperatures.
| Protect this device from shocks and abuse. Avoid brute force when operating
the device.
| Do not use the device when damage to housing or cables is noticed. Do not
attempt to service the device yourself but contact an authorized dealer.
General Guidelines
- Familiarise yourself with the functions of the device before actually using it.
- All modifications of the device are forbidden for safety reasons. Damage caused by user modifications to the device is not covered by the warranty.
- Only use the device for its intended purpose. Using the device in an unauthorized way will void the warranty.
- Damage caused by disregard of certain guidelines in this manual is not covered by the warranty and the dealer will not accept responsibility for any ensuing defects or problems.
- Keep this manual for future reference.
Features:
- Voltage and Current dual LED display
- Voltage and Current Coarse/Fine adjustment
- Protection mode: limited current output
- Parallel or serial connection detection to automatically switch outputs
- The stylish plexiglass display panel
- Memory: 3 programmable memories
Description
The QJ3003GIII/QJ3005GIII is a high-precision, variable DC power supply. It can operate on either Constant Voltage (C.V.) or Constant Current (C.C.) mode. While on C.C. mode, the voltage is adjustable between 0 and 30 volts. Whereas the current is adjustable between 0 and 5 amps when on C.V. mode. Dual channels output for convenient serial or parallel setup, the 3 rd output is fixed output at 5 volts.
| 1 | Power Switch: On/Off Switch | 13 | Channel 2 Voltage Display |
|---|---|---|---|
| 2 | Switch: Output On/Off | 14 | Channel 1 Status Indicator |
| 3 | CH1 Channel 1 | 15 | Channel 1 Voltage Display |
| 4 | CH2 Channel 2 | 16 | Channel 2 Current Display |
| 5 | Data Storage | 17 | Channel 2 Status Indicator |
| 6 | Parallel Connection Button | 18 | Channel 1 Current Display |
| 7 | Serial Connection Button | 19 | Channel 2 Output |
| 8 | Key Lock | 20 | Ground |
| 9 | Voltage Adjustment Knob | 21 | Channel 1 Output |
| 10 | Current Adjustment Knob | 22 | Fixed Output 5V @ 3A |
| 11 | Voltage Coarse/Fine Adjustment Indictor | 23 | Ventilation Fan |
| 12 | Current Course/Fine Adjustment Indictor | 24 | Power cord connector and fuse |
box
| | |
Operation
Turn on or off the power source
- Connect the included power cord to the backside 【 15 】 of the power supply, and plug the other end into a properly grounded power outlet.
| Always connect the equipment to a grounded power outlet.
---|--- - Press the power button 【1 】to turn on the power supply, at this point there’s no output voltage or current at the output terminals.
- Press the power button 【1】to turn off the power supply,
Operating on C.V. or C.C. mode
Adjust channel 1’s voltage or current, press the CH1 button 1st, and the CH1
button will light up, and the CH2 indicator light will be off.
Adjust channel 2’s voltage or current, press the CH2 button 1st, and the CH2
indicator light will turn on, and a CH1 indicator light will be off.
On constant voltage mode, a voltage can be set anywhere between 0 and 32
volts.
If the output current is over the limit, then the power supply will
automatically switch to C.C. mode.
On constant current mode, a current can be set anywhere between 0 and 3 amps.
By default, channel 1 will be automatically selected as the output when the
power supply is switched on.
While the power supply is not on “MEN” or “LOCK” mode, press the SER button,
the serial connection is enabled, the SER light will turn on, and the parallel
model is disabled. Connect the load to the power supply by following the
indication “SER OUT” on the output terminals, and adjust the voltage
adjustment knob and current adjustment knob to their respective desired
levels, now the output voltage “SER OUT” can be adjusted in a range from 0 to
60 volts, and the current is from 0 to 5 amps.
While the power supply is not on “MEN” or “LOCK” mode, press the PARA button, the parallel connection is enabled, the PARA light will turn on, and the serial connection model is disabled. Connect the load to the power supply by following the indication “PARA OUT” on the output terminals, and adjust the voltage adjustment knob and current adjustment knob to their respective desired levels, now the output voltage “PARA OUT” can be adjusted in a range from 0 to 32 volts, and the current is from 0 to 10 amps.
Set up pre-set voltage and current
Up to 3 pairs of voltage and current values can be preset by using M1-M3 memory buttons.
-
Press the Voltage/Current selection button
-
While all “PAPA”,“SER”， “LOCK”, and “OUTPUT” are disabled, press the “MENU” button to turn it on, now the
The “MEN” button will light up. To turn it off, press the “MEN” button again. -
Press one of the memory buttons M1-M3 to save the preset voltage and current value, the unit will beep twice to confirm a successful save.
Recall Preset Memory
While all“PAPA”, “SER”， “LOCK”, and “OUTPUT” are disabled, press and hold one of the memory buttons M1-M3 to recall the preset voltage and current value, release the button after 2 beeps, and the recall is a success. Now the screen will display stored voltage and current value.
Load Connection
- Connect the positive end of the load to the power supply’s red (+) terminal [14]
- Connect the negative end of the load to the power supply’s black (-) terminal [12]
- You may connect the positive terminal “+” or negative terminal “-“ to the green ground terminal with a conductive wire to realize 0 potential at the ground, or the output will be floating between 0 potential and ground.
Quick Operation
Press the ON/OFF button [1] to turn on the power supply, then press the OUTPUT
button [2], and the power supply is ready to work on C.V. mode. The screen
will display the actual voltage and current value. If the output current is
over the preset limit, the power supply will enter C.C. mode. Now the C.V.
indicator light will turn off, and the C.C. indicator light will turn on.
After the operation, please the ON/OFF button [1] to turn off the power
supply.
MainForn
Main form Main Functions
- Voltage/Current output indication displays real-time output voltage and current value.
- Voltage/Current setup, setup window displays the setup value of the voltage and current, the setup value can be adjusted by press
- The voltage waveform displays voltage fluctuation over time.
- The current waveform displays current fluctuation over time.
Cleaning and Maintenance
1. Disconnect the device from the mains prior to maintenance activities.
1. The power supply cables must not show any damage. Have a qualified
technician maintain the device.
2. Wipe the device regularly with a moist, lint-free cloth. Do not use
alcohol or solvents.
3. There are no user-serviceable parts, apart from the fuse. Contact your
dealer for spare parts if necessary.
4. Store the device in a dry, well-ventilated, dust-free room.
Replacing the Fuse
1 Only replace the fuse with a fuse of the same type and rating.
1 Before replacing the fuse, unplug the mains lead.
2 Wedge the fuse holder out of its housing with a flat-head screwdriver.
3 Remove the damaged fuse from its holder and replace it with the exact same
type of fuse4
Insert the fuse holder back in its place and reconnect the power.
Technical Specifications:
| Model Number | QJ3003G1I1 I | QJ3005GIII |
|---|---|---|
| Output Voltage | 220 V/ 50 Hz | |
| Fuse | T4A /250 V | T5A /250 V |
| Output Voltage | 0-30 V — | 0-30 V — |
| Output Current | 0-3A | 0-5 A |
| Power effect | C.V. < 0.01 % + 3 mV | C.V. < 0.01 % + 3 mV |
| C.C. < 0.1 °/0 + 3 mA | C.C. < 0.1 % + 3 mA | |
| Load Effect | C.V. < 0.01 % + 3 mV | C.V. < 0.01 % + 5 mV |
| C.C. < 0.1 % + 5 mA | C.C. < 0.1 % + 10 mA | |
| Resolution | 10 mV | 10 mV |
| 1 mA | 1 mA | |
| Accuracy (25 ° C ± 5 ° C) | < 0.1°/0 + 20 mV | < 0.1% + 20 mV |
| <0.1 % + 5 mA | <0.1 % + 5 mA | |
| Ripple & Noise (20Hz-20MHz) | < 1 mV rms | < 1 mV rms |
| < 3 mA rms | < 3 mA rms | |
| Temperature Coefficient | < 150 ppm | < 150 ppm |
| < 150 ppm | < 150 ppm | |
| Readout Resolution | 10 mV | 10 mV |
| 1 mA | 1 mA | |
| Readout Temperature Coefficient | < 100 MMS | < 100 MMS |
| < 100mms | < 100mms | |
| Parallel Load Regulation | -.c. 0.1 cY0+0.1 V | C. 0.1 %+0.1 V |
| Serial Load Regulation | < 0.1%+0.1V | < 0.1%+0.1V |
| Dimensions | 220(W) x 145(H) x 310(D) mm | 220(W) x 145(H) x 310(D) mm |
| Weight | 6.5Kg | 7Kg |
| Fixed Output | 5V/3A | |