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UTD2000M User Manual
Chapter 4 System Message & Troubleshooting
4.1 Explanation on System Messages
Adjusting Limit Reached: It prompts that under current state, the adjustment gained through the use of the
"MULTIPURPOSE" knob has reached its limit and that we should stop further adjusting. Such message appears
when vertical scale coefficient knob, time base knob, horizontal and vertical displacement knobs and trigger level
reach their adjustment limit.
USB Device Installed Successfully: When a U‐disk is inserted into an oscilloscope, if successfully connected, this
message appears on the screen.
USB Device Removed: This message appears on the screen, when a U‐disk is removed from an oscilloscope.
I/O Operation Failure: In case the communication with U‐disk is not successful or no document in the U‐disk is
found to be in conformity with the requirements.
Saving: This message appears on the screen with progress bar showing to its right when saving a waveform.
4.2 Troubleshooting
1．In case the oscilloscope still shows black screen (displaying nothing) when both the power and soft start switch
are turned on, please follow the following steps to deal with it accordingly.
①、Check if power plugs are connected properly and whether the mains supply is normal.
②、Check if the power switch is indeed turned on, when it is turned on, the soft start switch on the front
panel should have red light on. Once the soft start switch is pressed down, if the unit does start, we should hear
the noise of relay.
③、If there is the noise of relay, it indicates the oscilloscope has been started normally. Then we can try the
following operations: press UTILITY key, then press F1 and F5 one after another, finally, turn "MULTIPURPOSE"
knob to right. If it becomes normal, it indicates that the unit's contrast ratio had been set too low.
④、Once above steps are completed, please restart the oscilloscope.
⑤ 、 If still the unit can not work properly, please contact us and let us help you.
2. If the screen shows no waveform after the signal has been sampled, please follow the following steps to deal
with it accordingly:
①、Check if the probes have been correctly connected to the signal wires.
②、Check if signal wires have been correctly connected to BNC (channel connector).
③、Check if the probes have been correctly connected to subject under test.
④、Check if the subject under test has generated any signal (it is suggested to connect channel that has
signal to channel that may have problem in order to find the problem)
⑤、Resample the signal again.
3． Amplitude of the voltage to be measure is 10 times larger or smaller than actual value: Check if the attenuation
coefficient of the channel is consistent with the attenuation coefficient of the probes used.
4、Though waveform can be displayed, it can not be displayed stably:
①、Check the trigger source setting in trigger menu to see if it is in conformity with the channel that has
actual signal input.
②、Check trigger type: it should set to be edge triggering for common signals. Waveform can only be
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