YOKOGAWA CA71 HANDY CAL, Руководство пользователя

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IM CA71-E
9-1
Troubleshooting
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App
9. Troubleshooting
■ Failure Checklist
Troubleshoot the cause of any problem using the following checklist.
Should the problem persist even if you have taken the given
corrective action or if you notice any problem not listed herein, contact
the vender from which you purchased the instrument.
Problem Corrective Action
The LCD shows nothing even
if the POWER switch is
turned on. – When the calibrator is operated on batteries
• Make sure the batteries are securely housed in
the holder.
• Check if the batteries are too low.
• Check if the AC adapter plug is inserted to the
calibrator but the adapter is not connected to the
AC power source.
– When the calibrator is operated on AC adapter
• Check if the AC adapter is reliably supplied with
electricity.
The LCD shows everything
except for the measured value.
• Check if the MEASURE OFF key for turning
on/off the MEASURE mode is set to OFF.
The SOURCE indicator remains
set to OFF even if the SOURCE
ON key is operated for signal
source.
• When in voltage signal source, check if the load
current is beyond the specified limits.
• When in current signal source, check if the load
resistance is too large.
The output cannot be turned on
for signal source, or no signal
is output even if the output is
turned on.
• The built-in fuse may blow off if any abnormal
voltage level is applied to the output terminals.
If this is the case, the calibrator needs repair.
The measured and sourced
signal values are abnormal.
• Check if the signal carries noise.
• When in resistance signal source, check if the
input stage of the device under test contains a
capacitor with an excessively large capacitance.
The calibrator cannot be
configured or controlled
via RS232 interface-based
communication.
• Make sure the communication parameter
settings are correct.
The hold function of the
MEASURE mode does not
work at all.
• Check if the communication mode is set to
tonLy or Print .
The LCD shows Err60 at
power-on.
• The calibrator needs repair.