0-30VDC 0-5A Regulated Lab Power Supply
MP-3840
User Manual
Features:
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Professional, highly flexible lab power supply
Select precise voltage levels and current limits
Prevents overheating, burnout and over-current
Short-circuit protection
Surface mount technology with a powerful internal cooling system
1mV ripple voltage
0 to 30VDC adjustable voltage output
0 to 5A adjustable current limit
Bright 4-digit LCD display
Button lock function
Banana plug/binding posts on front of unit
Please familiarise yourself with the functions of this product before use.
We recommend keeping this manual for ease of reference.
If you experience issues with this product within the warranty period
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then please contact Techbrands by Electus Distribution.
Only use this product for its intended purpose.
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Modifications to this product are forbidden for safety reasons.
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The warranty will be void if the product has been used in an unauthorised
manner and/or the product has been subject to user modifications.
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Any damages caused as a result of disregarding the guidelines within this
manual will not be covered by the warranty.
Warnings:
1) Keep this product away from children and unauthorised users.
2) ALWAYS connect the product to an earthed mains outlet.
3) Only use this product INDOORS. Keep it somewhere dry where risk of
exposure to dust, rain, moisture or spilt liquids is low. Never put objects
filled with liquids on top of, or close to, the product.
4) DO NOT disassemble or open the cover of this product under ANY
circumstances. Touching live wires can cause life-threatening electric
shocks. Apart from the fuse, there are no user-serviceable parts.
5) This product will heat up during use. Make sure the ventilation openings
are clear at all times. For sufficient air circulation, create 25mm+ clearance
in front of the ventilation openings. Ensure you position the product on a
flat, heat resistant surface to use. Do not place the device on carpet, fabric
or any other flammable surface.
6) Always disconnect the product from mains power when not in use. Handle
the power cable by the plug only.
7) Keep this product away from dust and extreme temperatures.
8) Avoid brute force when operating the device. Do not drop it.
9) Immediately discontinue use if you notice any damage to the product's
housing or cables. Do not attempt to repair any damage yourself.
10) Disconnect the product from mains power prior to maintenance activities.
11) Use a moist, lint-free cloth to clean the product. Do not use alcohol or
solvents.
Replacing The Fuse:
1. The fuse is the ONLY component you should service. For all other issues,
please contact Techbrands by Electus Distribution or a specialist repairer.
2. Only replace the fuse with a fuse of the same type and rating.
3. Before replacing the fuse, unplug the mains cable.
4. Wedge the fuse holder out of its housing with a flat-head screwdriver.
5. Remove the damaged fuse from its holder and replace with the exact
same type of fuse.
6. Insert the fuse holder back into its place and reconnect power.
Functions:
(connected to the chassis and earth
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Power button
2
Current adjustment dial
3
Ampere meter
8
Panel lock indicator
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Voltage adjustment dial
10
Earth (ground) terminal
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Volt meter
(displays voltage limit)
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Over-current protection indicator
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Constant current indicator
(lights up when product is in constant
current mode)
7
Constant voltage indicator
(lights up when the device is in
constant voltage mode)
pin of the power supply socket)
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Output terminals
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Fan
13
Power supply socket
14
Fuse holder
Operation:
Switching On/Off:
Connect the enclosed power cable to the back of the product, then
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plug the other end into an earthed mains power supply.
Press the POWER button to switch the power supply on.
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The device will display the last used setting.
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Press the POWER button again to switch the power supply off.
Disconnect the product from mains power.
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Setting the Output voltage:
Push the VOLTAGE dial once. The Tens digit will blink. Turn the knob
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and adjust as desired.
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Push the VOLTAGE dial again to adjust the Ones digit.
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Do the same for the tenths and hundredths digits.
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When done, wait a few seconds until the display stops blinking.
The voltage is now set.
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Setting the Constant Current limit:
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Push the CURRENT dial once. The Tens digit will blink. Turn the knob
and adjust as desired.
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Push the CURRENT dial again to adjust the Ones digit.
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Do the same for the tenths and hundredths digits.
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When done, wait a few seconds until the display stops blinking.
The constant current limit is now set.
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Note that the power supply will be in Constant voltage mode until the
output current is higher than the set value. When in Constant current
mode, the CC LED lights up. Current is kept constant but the voltage
changes with respect to load resistance.
Connecting a load:
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Connect the load’s positive terminal to the RED positive terminal of the
product.
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Connect the load’s negative terminal to the BLACK negative terminal
of the product.
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You can connect the positive or negative terminal to the green earth
terminal of the power supply. This will pin the voltage to 0V (earth
potential) at that terminal.
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If the earth terminal is unconnected, the output floats with respect to
the ground.
Locking the panel controls:
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Lock the front panel controls to prevent accidental/unwanted changes
or adjustments.
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Press and hold the CURRENT adjustment dial until the lock indicator
lights up. The controls are now locked. Output voltage cannot be
adjusted.
To unlock the controls, press and hold the CURRENT dial again
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until the lock indicator switches off.
Over-current protection:
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Press and hold the VOLTAGE adjustment dial until Off/On is displayed
on the LCD screen.
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Turn the Voltage dial to adjust to On. OCP indicator will light up.
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To change the OCP limit, push the CURRENT dial and adjust as
needed.
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When done, press and hold the Voltage dial for 3 seconds and release.
OCP limit is now set.
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If the output current becomes higher than the set value, the power
supply will cut off and the OCP indicator flashes.
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To recover, turn off the power supply. Disconnect the load. Restart the
power supply.
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To disable OCP, press and hold the VOLTAGE adjustment dial until On
is displayed on the LCD screen. Turn dial to change to Off. Push
Voltage dial once to exit.
Troubleshooting:
Problem: Solution:
Nothing happens when the buttons on
the panel are pushed.
Power is being delivered to the power
supply unit and the output is switched
on, but there is no output.
The output voltage rises slowly when
the output is switched on.
Check the panel controls are not locked.
To unlock, press and hold the Current
dial until lock indicator is off.
The load may not be connected
properly. Check the connections.
Alternatively, the current is set to 0.
Review the settings and adjust
accordingly.
The set current is too low. Review the
settings and adjust accordingly.
Technical Specifications:
Input Voltage: 220-240AC 50-60Hz
Output Voltage: 0-30V adjustable (10mV accuracy)
Output Current: 0-5A adjustable (1mA accuracy)
Ripple Voltage: 1mV
Ripple Current: 3mA
Dimensions: 270(L) x 120(W) x 185(H)mm
Weight: 4.8kg
This product must not be disposed of as domestic waste. It must be disposed of at an authorised place
for recycling of electrical equipment and appliances. By recycling waste, you help save natural
resources and make sure the product is disposed of in an environmentally friendly manner.
Distributed by:
TechBrands by Electus Distribution Pty. Ltd.
320 Victoria Rd, Rydalmere NSW 2116 Australia
Ph: 1300 738 555
Int’l: +61 2 8832 3200
Fax: 1300 738 500
www.techbrands.com
Made in China
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