Troubleshooting; Chapter 14- Technical Specification - UNI-T UTD2000CEX-II Series User Manual

UTD2000CEX-II
User Manual
13.2 Trouble shooting
(1) When the power button is pressed and the oscilloscope is black screen:
① Check the power supply connection
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 sound, it indicates that the oscilloscope is activated. Try the
following operation: press DEFAULT key, then press F1 key, if device
return to normal, it means backlight brightness is too low
④ After completing the above steps, restart the oscilloscope.
⑤ If you still cannot solve this problem, please contact UNI-T and let us
serve you.
(2) After signal acqusition, wavform 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
④ Check the input signal of the analog channel and that channel is open
⑤ Make sure that the probe is connected to the compensation piece and
check whether the probe is normal
⑤ Check to see if there is a signal to be detected
⑥ Press AUTO button for signal re-acquisition
(3) The measured amplitude value is 10 times larger or smaller than the
actual value:
Make sure that the probe attenuation coefficient 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 the signal
and channel are consistent
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 or low frequency in
order to suppress or remove noise caused by interference
(5) Pressing the RUN/STOP key and no waveform is displayed:
① Check whether the trigger menu's trigger method is set to normal, and
whether the trigger level has exceeded the waveform range. If it exceeded,
center the trigger level or set the trigger mode to auto with the AUTO
key
② Press the AUTO button to complete the above settings
(6) Waveform refresh rate is too slow:
① Check whether the acquisition mode is set to average, and the number
of average is too big
② You can speed up the refresh rate by reducing the average times or
select other methods such as normal sampling

Chapter 14- Technical specification

Aside from specification labeled "typical", all specifications are guaranteed.
Unless otherwise stated, all technical specifications are applicable to
probe attenuation 10X and with UTD2000CEX-II series oscilloscope.
Oscilloscope must first meet the following two conditions in order to
achieve these standards:
The instrument must be operated at the specified operating temperature
for more than thirty minutes.
If the operating temperature exceeds 5 degrees Celsius from normal
operating temperature, self calibration needs to be performed.