10-1
IM CW500-01EN
10.1 Troubleshooting
If you suspect that the CW500 is malfunctioning, check the following
items. If your problems is not listed, contact your nearest YOKOGAWA
dealer.
Symptom
Check
The power does not
turn on even when
the power key is
pressed. (Nothing
is displayed on the
LCD.)
When operating on AC power
• Check that the power cord is connected properly to an
outlet.
• Check that the power cord is not broken.
• Check that the supply voltage is within the allowable
range.
When operating on battery power
• Check that the batteries are set with proper polarity.
• If you are using AA nickel-metal hydride (Ni-MH)
batteries, check that they are charged sufficiently.
• If you are using AA alkaline batteries, check that the
batteries are not flat.
If you problem is still not solved
• Disconnect the AC power cord, and remove all the
batteries. Load the batteries again, connect the AC
power, and turn on the power. If the CW500 still fails to
turn on, it may be malfunctioning.
Keys do not work.
• Check that key lock is not activated.
• Check the valid keys of each measurement range in
this manual.
Measured values are
not displayed.
Measured values
are unstable or
inaccurate.
• Check that the frequency applied to voltage channel 1
is within the guaranteed accuracy range. It should be
between 40 to 70 Hz.
• Check that the voltage probes and current clamp-on
probes are connected properly.
• Check that the CW500 settings and wiring are
appropriate for the measurement line.
• Check that the current clamp-on probe and clamp
settings are correct.
• Check that the voltage probes are not broken.
• Check whether noise is introduced in the input signal.
• Check that there are no strong electromagnetic fields
nearby.
• Check that the measurement environment meets the
specifications of the CW500.
Chapter 10 Troubleshooting
