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Tenma 72-8710 - Page 82

Tenma 72-8710
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3. The measurement voltage amplitude value is 10 times larger or MODE to AUTO.
smaller than the actual value :
② Press [AUTO] to complete the automatic setup.
Check if the channel attenuation factor corresponds with the
6. Display speed is slow after average sampling time is enabled :
probe attenuation you have chosen.
① If average sampling is carried out for more than 32 times,
4. There is waveform display but it is not stable :
the display speed will drop. This is normal.
① Check the TRIGGER SOURCE setup in the trigger menu.
② You can reduce the intervals of average sampling.
See whether it is the same as the actual signal input
7. Trapezoidal waveform display :
channel.
① This is normal. The reason is possibly horizontal time base
② Check the trigger type : Use EDGE TRIGGER for ordinary
range is too low. You can improve horizontal pixel aspect
signals and VIDEO TRIGGER for video signals. Stable
ratio and enhance the display quality by increasing the
waveform display is achieved only when the correct
horizontal time base.
trigger mode is selected.
② If the display type is VECTOR, the connection between
③ Try changing the COUPLING display to HIGH
sampling dots may cause a trapezoidal waveform. Set the
FREQUENCY SUPPRESSION or LOW FREQUENCY
display type to DOT to solve this problem.
SUPPRESSION to filter any high or low frequency noise
that is interfering with triggering.
5. No display after pressing [RUN/STOP] :
① Check if the TRIGGER MODE is set to NORMAL or SINGLE
in the menu, and whether the level exceeds the waveform
range.
If so, move the trigger level to the centre or set TRIGGER
80
DSO Series User Manual