Power Up Checks - 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
(110V or 220V). 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 includes 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 lights
switch ON displaying voltage and 0.0 current. To check the current level, turn the control knob one
click in either direction. The current display returns to 0.0 after a few seconds.
The Table below illustrates the Self‐Test sequence:
Self test display and Sequence Test Description
Software version
Display check
C.V. Indicator check
C.C. Indicator check
Rear indicator check
C.V. recheck
Test continuing
Over voltage protection check
Over load protection check
Over temperature protection check
Fan check
Output off (remote control mode)
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