Circuit-test PSC-4120, Operation Manual

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8
Operations
Basic Mode of Operation
This power supply is designed to operate as a constant voltage source or as a
constant current source. Automatic crossover to either mode of operation occurs
when the load condition changes as following:
Constant Voltage (CV), Automatic crossover &
Constant Current (CC)
The power supply functions as a constant voltage source (CV) as long as the load
current is less than the preset current limiting value. When the load current is
equal to or greater than the preset current limiting value, the power supply will
automatically cross over to the constant current mode, voltage will drop, (CC) will
show on the LCD display panel and it will operate as a constant current source.
When the load current drops below the preset current limiting value, the supply
returns to constant voltage (CV) mode.
Set the Output Voltage and Presetting Current Limiting Value (CC)
Turn the voltage or current knob to set the desired values.
Quick pushes on the knobs will move the decimal place for fast tuning.
Turn the knob when the desired number column flashes otherwise will need to
repeat quick pushes again.
One quick push on the current knob will display the preset current limiting value.
Aux. output 1 voltage selection
Move the switch 4 at the back of power supply for selection of 3.3 or 5 VDC.
At 3.3VDC setting, indicator 15 will be Off and at 5VDC setting indicator 15 will
be ON.
Connecting and Operating Procedure
1. Check the rating label and plug in to AC mains.
2. Switch on the power supply and the LCD display should be ON at the
same time.
3. The (CV) icon will appear on the display.
4. Turn Current knob 6 to maximum clockwise if you do not require lower
current limiting value, otherwise do the preset the (CC) limiting procedure.
5. Set your desired output voltage and then turn off the output terminal with
push button 7 .