Chapter 7 Troubleshooting
7.1 The Oscilloscope cannot power on:
The battery may run out. Try to power on the Oscilloscope again with use of the power adaptor. If the
instrument still doesn’t work, please contact UNI-T for the service.
7.2 The Oscilloscope turns off a few seconds later after powered on:
The battery may run out. Check if the low battery indicator appears on the screen. If it does, please
recharge it.
7.3 Measuring voltage amplitude is 10 times larger or smaller than exact value:
Make sure channel attenuation factor is consistent with probe factor on the applied probe.
7.4 No waveform displays after acquiring signals:
1. Make sure the probe is properly connected to the connection wire.
2. Make sure the connection wire is correctly attached to BNC (channel connector)
3. Make sure the probe is properly connected to the tested object.
4. Make sure there are signals generated from the tested object (you can connect the channel that can
produce signals to the suspected channel and verify the cause)
5. Restart the acquisition
7.5 The waveform does not display steadily:
1. Check if trigger source that has been set up in trigger menu is the same with actual input channel
2. Check trigger type: Edge type is generally selected for common signals, use video trigger type for video
signals. Onlywhen proper trigger type has been set up can the waveform display steady.
3. Try to change Coupling to HF Reject to filter out the high-frequency inteference noise in the signal.
7.6. There is no display after pressing down RUN/STOP button:
1. Check if Trigger Mode in trigger menu is Normal or Single and trigger level has gone beyond waveform
ranges. If they are, set trigger level to the middle or set trigger Mode to AUTO
2. Or you can press AUTO to automatically finish the setup mentioned above.
7.7 The display slows down after having applied AVG mode for a while:
1. If AVG number go above 32times, it is normal for the oscilloscopes to display at a relatively low rate.
2. Reduce AVG number
7.8 The waveform display has a stair-stepping shape:
1. It is normal situation, it may be caused by lower horizontal timebase, increasing the timebase can
improve the horizontal resolution and the display
2. If display type is VECTOR, links between sample points could probably result in stair-stepping shape.
Change display type to Dots can solve the problem.
Chapter 8 Service and Support
8.1 Updating Program
Contact UNI-T or log into our website to obtain the latest program package, unzip the package and
apply the Oscilloscope program update system to update the Oscilloscope so as to ensure your oscilloscope
has the latest version of firmware issued already by UNI-T
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UTD1000L User Manual
