LABPS3 005 D
V. 03 – 25/08/2014 5 © Vellem an nv
Using the Pow er Supply in Constant Volt a ge Mode
If you want to use the power supply in constant voltage mode, you set up the desired output voltage
betw een 0V and 30V. You also set up the desired current lim it .
If the output current exceeds the lim it, the pow er supply automatically goes into constant current mode.
Using the Pow er Supply in Constant Current Mode
If you want to use the power supply in constant current mode: you set up the desired output current
between 0A and 5A. You also set up the desired voltage limit.
Sett ing Voltage and Current
You can save 4 different voltage/current settings using the memory keys M1~ M4.
1. Press the memory key [ 5 ] of the memory for which you want to define the settings. The
correspo nding indicat o r M1~ M4 [ 13 ] lights and the existing settings for voltage and current are
displayed.
2. Press the Voltage/ Current key [ 1 6 ] to set the voltage. The voltage readout flashes.
oFor use in constant voltage mode: this is the desired constant voltage.
oFor use in constant current mode: this is the desired voltage limit.
oIf you enable overvoltage protection, the output switches off automatically if the voltage
exceeds t his value.
3. Turn the adjustment knob [14] until you reach approximately the desired voltage. Press <or >
[15] to select a digit in t he voltage readout [ 7 ] and turn the adjustment knob to fine-tune.
4. Press the Voltage/ Current key [ 1 6 ] again to set the current. The current readout flashes.
oFor use in constant voltage mode: this is the desired current limit.
oFor use in constant current mode: this is the desired constant current.
oIf you enable overcurrent protection, the output switches off autom atically if the current
exceeds this value.
5. Turn the adjustment knob [14] until you reach approximately the desired current. Press <or >
[15] to select a digit in the current readout [ 6 ] and turn the adjustm ent knob to fine-tune.
6. Press the memory key again (or wait until the display stops flashing).
The settings are saved in the selected memory.
Recalling Settings
To recall one of the saved settings, press the corresponding memory key M1~M4 [ 5 ] . The corresponding
ind icato r M1~ M4 [ 1 3 ] lights and the corresponding voltage/current settings appear on the display.
Not e: the output is switched off automatically when you press a m emory key to recall a setup.
Using M em ory 5
To use memory 5, proceed as follows:
1. Press m emory key 4 and turn the adjustment knob until indicator M5 lights.
2. Set the voltage and current as desired. Wait unt il t he disp lay sto ps flashing . The sett ings are
aut om atically stored in m emory 5.
3. To recall the settings, press m emory key 4 and turn the adjustm ent knob again until indictor M5
lights.
Connecting a Load
1. Connect the load’s positive terminal to the red + t erm inal [18] of the power supply.
2. Connect the load’s negative terminal to the black – term inal [18] of the power supply.
3. You can connect the + or – terminal to the green earth terminal [17] of the power supply to pin the
voltage to 0V (earth potential) at that terminal.
If you leave the earth terminal unconnected, the output floats with respect to the ground.
Applying Voltage to the Load
1. Press the Off/ On key [ 1 ] to apply the voltage to the load.
The OUT [ 12 ] and C.V. indicators [11] light. The power supply works in constant voltage (CV)
mode; the display now shows the actual output voltage and current.
If the current exceeds the set current lim it , t he po wer supply autom at ically goes int o constant
current (CC) mode. The C.V. indicator goes out and the C.C. indicato r [ 1 0 ] light s.
2. Press the Off/ On key [ 1 ] to switch the output off.