USER’S MANUAL. OS-782
Page 61
02-2010
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6 TROUBLE SHOOTING
1.
The oscilloscope does not power up.
It may be caused by the dead battery. At this time, the oscilloscope will not
start even if it is powered by the battery charger. Firstly, charge the battery and
supply the oscilloscope with power through the battery charger. However, don’t
switch on the oscilloscope till waiting for 15 minutes. If the oscilloscope still
cannot start, please contact PROMAX for service.
2.
The oscilloscope stops work only after operating for several seconds.
Probably the battery is dead, Check the battery symbol at the upper right of the
screen. The symbol indicates that the battery has been run out of power and
must be charged.
3. The measurement type displays ERR when you switch to the multimeter
mode.
Probably you do not select the measuring mode. In this case, push down any
key of the three keys V, A and R. Thus, the relative measuring mode will be
shown on the screen. If the ERR is still displayed, restart the oscilloscope.
4. The measured voltage amplitude value is 10 times larger or smaller than
the actual one under the oscilloscope mode.
Check whether the channel attenuation factor matches the actual probe error
ratio.
5. The waveform is displayed on the screen but is not stable under the
oscilloscope mode.
•
Check whether the signal item in the trigger mode menu matches the
actually used signal channel.
•
Check on the trigger mode: The edge trigger mode is applicable to the
universal single and the video trigger mode applicable to the video signal.
Only when the proper trigger mode is applied, can the waveform be in
stable.
•
Try to change the trigger coupling into the
HF repression
and
LF
repression
to filter the HF or LF noise trigger by the interference.
