Troubleshooting - PeakTech 1240 Bedienungsanleitung

36. Troubleshooting

1. Oscilloscope is powered on but no Display.
* Check whether the power connection is connected properly.
* Check whether the power switch is pushed down to the designated position.
* Check whether the fuse which is beside the AC power input jack is blew (the cover can be pried open
with a straight screwdriver).
* Restart the instrument after completing the checks above.
* If the problem persists, please contact Lilliput and we will be under your service.
2. After acquiring the signal, the waveform of the signal is not displayed in the screen.
* Check whether the probe is properly connected to the signal connecting wire.
* Check whether the signal connecting wire is correctly connected to the BNC (namely, the channel
connector).
* Check whether the probe is properly connected with the object to be measured.
* Check whether there is any signal generated from the object to be measured (the trouble can be shot
by the connection of the channel from which there is a signal generated with the channel in fault).
* Make the signal acquisition operation again.
3. The measured voltage amplitude value is 10 times or 1/10 of the actual value.
Look at the attenuation coefficient for the input channel and the attenuation ration of the probe, to make
sure they are match (see "6. How to Set the Probe Attenuation Coefficient" on page 102).
4. There is a waveform displayed, but it is not stable.
* Check whether the Source item in the TRIG MODE menu is in conformity with the signal channel
used in the practical application.
* Check on the trigger Type item: The common signal chooses the Edge trigger mode for Type and the
video signal the Video. If Alternate trigger is selected, both of the channel 1 and channel 2 trigger
levels should be adjusted to the proper position. Only if a proper trigger mode is applied, the waveform
can be displayed steadily.
* Try to change the trigger coupling into the high frequency suppress and the low frequency suppress to
smooth the high frequency or low frequency noise triggered by the interference.
5. No Display Responses to the Push-down of Run/Stop.
Check whether Normal or Signal is chosen for Polarity in the TRIG MODE menu and the trigger level
exceeds the waveform range.
If it is, make the trigger level is centered in the screen or set the trigger mode as Auto. In addition, with the
Autoset button pressed, the setting above can be completed automatically.
6. The displaying of waveform seems getting slow after increasing AVERAGE value in Acqu Mode
(see "20. How to Implement Sampling Setup" on page 127), or a longer duration is set in the Persist in
Display (see "22. Persist" on page 130).
It's normal as the Oscilloscope is working hard on many more data points.
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