Chapter 14 System Prompts And Troubleshooting; System Prompt Information Description; Trouble Shooting - UNI-T UPO3000E Series User Manual

Chapter 14 System Prompts and Troubleshooting

14.1 System Prompt Information Description

Operation at limit: In the current state, adjustment has reached the limit and
cannot continue. When the vertical scale knob, time base knob, level shift,
vertical shift or trigger level, etc. reaches the adjustment limit, the prompt
will show up.
USB device is not inserted: When the USB storage device is not connected,
this prompt appears if you select a storage disk as USB.
Load Failed: When loading a saved setting or waveform, this prompt appears
if there is no stored setting or waveform in the memory location.

14.2 Trouble Shooting

(1) When the power button is pressed and the oscilloscope is black
screen:
① Check the power supply connection and check power supply is normal
or not.
② Make sure the power switch at the back of the oscilloscope is open, press
the front panel power key and confirm green light is present.
③ If there is a relay sound, it indicates that the oscilloscope starts normally.
Try the following operations: press the DEFAULT key, then press F1 , if
device returns to normal, it means backlight brightness is too low.
④ After completing the above steps, restart the oscilloscope.
⑤ If you still cannot use this product normally, please contact UNI-T and
let us serve you.
(2) After signal acquisition, waveform does not appear on display:
① Check if the probe is connected to the signal test point.
② Check if the signal line is connected to the analog channel input.
③ Check the analog channel of the input signal and that channel is open.
④ Connect the probe to the probe compensation signal connector on
oscilloscope's front panel and check whether the probe is normal.
⑤ Check to see if there is a signal to be detected (solve the problem by
comparing the channel with signal generated and the one with problem).
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Press AUTO button for signal re-acquisition.
(3) The measured voltage amplitude value is 10 times larger or smaller
than the actual value:
Make sure the probe attenuation coefficient in the channel matches the
attenuation of the probe used.
(4) There is a waveform but not stable:
① Check the trigger source in the trigger menu and confirm that it matches
the input channel of the actual signal.
② Check the trigger type: normal signals should use edge trigger mode.
Stable waveform will be displayed only by setting to the correct trigger
mode.
③ Try changing the trigger coupling to high frequency suppression or low
frequency suppression in order to filter out the high or low frequency
noise which might interfere the trigger.
(5) Pressing the RUN/STOP key and no waveform is displayed:
① Check whether the trigger mode is normal or single, and whether the
trigger level has exceeded the waveform range. If so, center the trigger
level or set the trigger mode to auto with the AUTO key.
② Press the AUTO key to complete the above settings automatically.
(6) Waveform refresh rate is too slow:
① Check whether the acquisition mode is average, and the average times
is large.
② You can speed up the refresh rate by reducing the average times or
select other acquisition mode such as normal sampling.
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