Troubleshooting - Extech Instruments 382260 User Manual

Trouble Shooting
PROBLEM
Power supply not
working
No DC output power
Voltage meter reading
grossly inaccurate
Ampere meter reading
grossly inaccurate
The activated
(auto- cross over )
c ur re nt limiting value
is different from the
preset cc value
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INDICATIONS
Panel display, LED
Indicators not on
Voltage meter zero
indication.
ALM (13) Alarm led on
CC (12) led on
Actual output voltage is
grossly different from
the meter read out
In CV mode , the actual
current measured is
grossly different from
the Amp meter reading
All indicators and
display are normal ,
only CC mode has the
problem
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POSSIBLE CAUSES
A. AC power input not
connected
B. AC input fuse
blown
A. Output on off button
not on .
B. UVL (10 )
protection triggered
C. OTP protection
triggered
D. Output short circuit
A. Volt meter shows
not the output
voltage.
B. Possible
misalignment in
voltmeter
calibration
Possible misalignment
in calibration .
For stand alone unit,
Master & Slave
Switch (17) in wrong
position (Slave). Wrong
setting or connection in
Master & S l a v e o r
s e t u p procedure.
7
SUGGESTED
SOLUTIONS
A. Check AC power
connection,
B. Contact factory
A . Check output LED
(9) is on or not,
push (9) to on.
B. C h e c k U V L s e t
voltage by pushing
(6), re-set UVL to
applicable limit.
C. Check vent holes at
top and bottom is
clear, ambient
temperature too
high
D. Check and undo
short circuit of
output connection.
A . C h e c k t h e L E D
indicator of UVL on
the top right hand
side of the Volt
meter, if it lights up
then the volt
meter only shows
the set UVL value.
Push (6) to go
back to output
voltage.
B . Contact factory
Contact factory
Check the Master &
Slave switch (17)
correct position. Use
stand alone mode to
check power supply
separately without any
connection to slave
u n i t s . F o l l o w t h e
procedure carefully and
make sure there is only
one Master unit.
382260-EN V1.5 7/12