Hioki 8847 - Trouble Shooting

18.1 Trouble Shooting
312
18.1 Trouble Shooting
If damage is suspected, check the "Troubleshooting" section before
contacting your dealer or Hioki representative.
If Power and Operating Keys Malfunction
Symptom Check Item, or Cause Remedy and Reference
The display does not
appear when you turn the
power on.
Is the power cord disconnected?
Are connections made correctly?
Verify that the power cord is connected
properly.
"2.5 Supplying Power" (
 p.33)
Keys do not work.
• Is any key being held down? • Verify key operation.
• Is the key-lock state active (Key-Lock
message displayed)?
• Deactivate the key-lock state. (Hold the
CURSOR keys for three seconds)
If the Display or Operations Malfunction
Symptom Check Item, or Cause Remedy and Reference
Blank screen
Is the backlight saver active? Press any
key to check.
Turn the backlight saver off.
A waveform does not
appear when you press
the START key.
• Is the “Pre-Trigger wait” message
displayed?
• Is the "Trigger wait" message dis-
played?
When pre-triggering is enabled, triggering is
ignored until the pre-trigger portion of the
waveform has been acquired. Recording
starts when a trigger occurs.
No changes occur in the
displayed waveform.
• Is the clamp sensor or connection
cable connected correctly?
• Is the vertical axis (voltage axis)
range set properly?
• Is the low-pass filter enabled?
Verify that the clamp sensor or connection
cable is connected correctly.
Verify the input channel settings.
While measuring with the
memory function, the dis-
played frequency is much
lower than the actual fre-
quency.
Aliasing may be occurring.
Change the timebase to use a faster sam-
pling rate.
"3.4.2 Time Axis Range and Sampling
Rate" (
 p.43)
Some channels are unus-
able.
Is the channel enabled for use?
"8.4 Setting Channels to Use (Extending
the Recording Length)" (
 p.127)
The displayed waveform
size does not change
when the input range is
changed.
Is the Variable function enabled?
Turn the Variable function off.
"8.6 Variable Function (Setting the
Waveform Display Freely)" (
 p.134)