User Manual

44. F.A.Q
1. In the case of that the oscilloscope is still in the black-screen state without any display after the
power is switch on, implement the following fault treatment procedure.
* Check whether the power connection is connected properly.
* Check whether the power switch is pushed down to the designated position.
* Restart the instrument after completing the checks above.
* If this product still cannot work normally, please get in touch with Lilliput and we will be under your
service.
2. After acquiring the signal, carry out the following operations if the wave form 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 greater or smaller than the actual value.
Check whether the channel attenuation coefficient and the attenuation ration of the probe used in
practical application is match.
4. There is wave form 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. Only if a proper trigger mode is applied, the wave form 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 wave form 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. After the AVERAGE value sampling is set in the ACQU MODE or the longer duration is set in the
DISP MODE, the display rate is slowed down.
It is a normal phenomenon.
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