Power Up Checks; Operation - Extech Instruments 382275 User Manual

Power Up Checks

1. First, check the rating label of the power supply and make sure it complies with the
AC mains voltage. Next, set the Mode Switch located on the rear of the power
supply to the Normal Position.
2. Listen for the cooling fan when switching on the power supply. The power supply
performs a series of self test checks on startup which include testing the cooling
fan. The fan will stop completely after a few seconds after running at high speed
indicating that it is in good order. The CV, V and A LEDs switch on displaying
voltage and 0.0 current. To check the current level, turn the control knob one click
in either direction to view the current value. The current display returns to 0.0 after
a few seconds.

Operation

Using the Control Knobs
The rotary encoder control knobs offer fine/coarse tuning with clicking movement.
1. Push the knobs to toggle between coarse and fine tuning, notice the subtle
changes in brightness of the related LED.
2. Adjust the knobs to the desired values by using coarse and then fine tuning. The
display will resume its normal brightness after a few seconds to confirm the
adjustment.
Connecting to UUT (Unit Under Test)
1. Connect the equipment to the power supply. Red (+) is connected to the positive
polarity input of the UUT and Black (-) is connected to the negative polarity input of
the UUT.
2. Switch on the power supply first; the panel meter & green CV Indicator should
switch on again.
3. Switch on the UUT; the panel meter & green CV Indicator should remain on.
4. The UUT is now ready. When operation is completed, switch off the UUT and
then the power supply.
5. When disconnecting the power supply from the UUT, disconnect the remote
sensing wire first and then disconnect the output cables.
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