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UTD2000 Series User Manual

Chapter XIII System Prompts and Trouble-

shooting

13.1 Definitions of System Prompts

Adjustment at Ultimate Limit: This informs you that the multifunction control knob has

reached its adjustment limit in the current status. No further adjustment is possible. When

the vertical deflection factor switch, time base switch, X shift, vertical shift and trigger level

adjustments have reached their ultimate limits, this prompt will appear.

USB Device Unplugged: After a USB key is unplugged from the oscilloscope, this prompt

appears.

USB Screen Shot: When pressing Prtsc, this prompt appears.

USB File Save: When the oscilloscope is saving a waveform, this prompt is shown on the

screen.

No signal in channel: When inputing slow signal, small signal or no signals, after

conducting auto setting, this prompt appears.

13.2 Troubleshooting

(1) No waveform appears

If no waveform appears on the screen after acquiring signals, please follow the steps

below to find the cause:

①. Check if the probe is connected to the signal test point correctly.

②. Check if the signal connection line is connected to the input point of analog

channel.

③. Check if the input point of analog channel signal is consistent with the open

channel.

④. Connect the probe tip to the compensating signal connector of DSO to check

if the probe is in good condition.

⑤. Check if the thing to be measured generates signals (connect the channel with

signal to the signal without signal to find the cause).

⑥. Press AUTO to recollect signals.

(2) Voltage test problem

The measured voltage amplitude is 10 times higher or lower than the actual value:

check if the attenuation coefficient of channel probe is consistent with the

attenuation rate of applied probe.

(3) No trigger

There is waveform display but it is not stable:

① Check the trigger Source setup in the trigger menu. See whether it is the same

as the actual signal input channel.

② Check the trigger type: Use Edge trigger for ordinary signals. Stable waveform

UNI-T UTD2000 Series User Manual

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