QJE QJ3003GIII User manual

QJ3003GIII QJ3005GIII
Programmable DC laboratory DC Power Supply 0-30V with USB 2.0 Interface

QJ3003GIII QJ3005GIII
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QJ3003GIII QJ3005GIII
USER MANUAL
1. 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.
2. 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 clear 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 device not in use or when servicing 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 authorised dealer.
3. 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 unauthorised 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.
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QJ3003GIII QJ3005GIII
4. 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
Stylish plexi-glass display panel
Memory: 3 programmable memories
5. 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 3rd 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 Coarse/Fine Adjustment Indictor
24
Power cord connector and fuse box
6. Operation
Turn on or off power source
1. Connect the included power cord to the backside 【 15 】 of the power supply, plug the other end into a
properly grounded power outlet.
Always connect the equipment to a grounded power outlet.
2. 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.
3. Press the power button 【1】to turn off the power supply,
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QJ3003GIII QJ3005GIII
7. Operating on C.V. or C.C. mode
Adjust channel 1’s voltage or current, press CH1 button 1st, the CH1 button will light up, and CH2 indicator light will be
off.
Adjust channel 2’s voltage or current, press CH2 button 1st, the CH2 indicator light will turn on, and 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 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 SER button, the serial connection is enable, the SER
light will turn on, and parallel model is disabled. Connect the load to the power supply by following the indication “SER
OUT”on the output terminals, 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 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, 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.
8. 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.
1. Press Voltage/Current selection button
2. While all“PAPA”,“SER”，“LOCK”,“OUTPUT”are disabled, press the “MEN”button to turn it on, now the
“MEN”button will light up. To turn it off, press the “MEN”button again.
3. 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.
9. Recall Pre-set Memory
While all“PAPA”,“SER”，“LOCK”,“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, the recall is a success. Now the screen
will display stored voltage and current value.
Load Connection
1. Connect the positive end of the load to the power supply’s red (+) terminal [14]
2. Connect the negative end of the load to the power supply’s black (-) terminal [12]
3. 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.
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QJ3003GIII QJ3005GIII
Quick Operation
Press ON/OFF button [1] to turn on the power supply, then press OUTPUT button [2] , 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 C.C.
indicator light will turn on.
After operation, please ON/OFF button [1] to turn off the power supply.
MainForn
Mainform Main Functions
1. Voltage/Current output indication, it displays real-time output voltage and current value.
2. Voltage/Current setup, setup window displays the setup value of the voltage and current, the setup value can be
adjusted by press
3. Voltage waveform displays voltage fluctuation over time.
4. Current waveform displays current fluctuation over time.
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QJ3003GIII QJ3005GIII
5. 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
1Only replace the fuse by a fuse of the same type and rating.
1Before replacing the fuse, unplug the mains lead.
2Wedge the fuse holder out of its housing with a flat-head screwdriver.
3Remove the damaged fuse from its holder and replace with the exact same type of fuse.
4Insert the fuse holder back in its place and reconnect power.
1. Technical Specifications:
Model Number
QJ3003GIII
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 % + 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% + 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
≤ 0.1%+0.1V
≤ 0.1%+0.1V
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
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