Troubleshooting; Calibration And Repair Services - Extech Instruments 382260 User Manual

Trouble Shooting
PROBLEM INDICATIONS
Power supply not Panel display, LED
working Indicators not on
No DC output power Voltage meter zero
indication.
ALM (13) Alarm led on
CC (12) led on
Voltage meter reading Actual output voltage is
grossly inaccurate grossly different from
the meter read out
Ampere meter reading In CV mode , the actual
grossly inaccurate current measured is
grossly different from
the Amp meter reading
The activated All indicators and
(auto- cross over ) display are normal ,
c ur re nt limiting value only CC mode has the
is different from the problem
preset cc value

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also provides
NIST certification for most products. Call the Customer Service Department for information
on calibration services available for this product. Extech recommends that annual
calibrations be performed to verify meter performance and accuracy.
POSSIBLE CAUSES
A. AC power input not A. Check AC power
connected
B. AC input fuse B. Contact factory
blown
A. Output on off button A . Check output LED
not on . (9) is on or not,
B. UVL (10 ) push (9) to on.
protection triggered B. C h e c k U V L s e t
C. OTP protection voltage by pushing
triggered (6), re-set UVL to
D. Output short circuit 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. Volt meter shows A . C h e c k t h e L E D
not the output indicator of UVL on
voltage. the top right hand
B. Possible side of the Volt
misalignment in meter, if it lights up
voltmeter then the volt
calibration meter only shows
the set UVL value.
Push (6) to go
back to output
voltage.
B . Contact factory
Possible misalignment Contact factory
in calibration .
For stand alone unit, Check the Master &
Master & Slave Slave switch (17)
Switch (17) in wrong correct position. Use
position (Slave). Wrong stand alone mode to
setting or connection in check power supply
Master & S l a v e o r separately without any
s e t u p procedure. 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.
7
SUGGESTED
SOLUTIONS
connection,
382260 V1.3 10/08