Quick Guide
UPO1000 Series
16/17
9.
Troubleshooting
(1)
When press the button, the oscilloscope is black screen.
a. Check whether the power is correctly connected, power supply is normal or not.
b. Check whether the power switch is really on, press the front panel power key and confirm green
light and a relay sound is present.
c. 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.
d. After completing the above steps, restart the oscilloscope.
e.
If you still cannot use this product normally, please contact UNI-T.
(2)
After signal acquisition, the waveform of the signal does not appear in picture.
a. Check whether the two ends of BNC line are connected properly.
b.
Check
whether
the output channel of signal source is opened.
c.
Check
whether
the intput channel of the oscilloscope is opened.
d. Check whether the signal in signal source has DC offset.
e. Plug out the input signal, check whether the baseline is in the center of the screen (if the baseline
is not in the center of the screen, it should be self-calibration.)
f.
If you still cannot use this product normally, please contact UNI-T.
(3)
The measured voltage amplitude value is 10 times larger or 10 times smaller than the actual value:
Check whether the channel probe attenuation coefficient settings are consistent with the used probe
attenuation rate.
(4) There is a waveform display but not stable.
a. Check the trigger settings in trigger menu whether is consistent with the actual signal input
channel.
b. Check the trigger type: general signals should use “Edge” trigger. Only when the proper trigger
type is used, the waveform can be displayed stably.
c. Try to change trigger coupling to HF rejection or LF rejection to filter out he high-frequency or
low-frequency noise that interfere the trigger.
(5) No waveform display after press RUN/STOP key.
a. Check whether the trigger mode in the trigger menu is on “Normal” or “Single” and whether the
trigger level exceeds the waveform range.
b. If it exceeds, set the trigger level to the middle or set the mode to “Auto”.
c. The above settings can be completed automatically by pressing AUTO key.
(6) Waveform refresh is very slow.
a. Check whether the acquisition method is average and the average times are large.
b. Check whether the storage depth is the maximum.
c. Check whether the trigger hold-off time is greater.
d. Check whether the trigger is normal and the current time base is slow.
e. All he above reasons will lead to slow refresh of waveform. It is recommended to restore the
factory settings, and the waveform can be refreshed normally.
