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DSO4202C DC 3 mV offset when it warms up

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Post time 2019-12-5 04:18:11 | Show all posts |Read mode
I have a DSO4202C.

After the unit warms up, there is a 3 to 5 mV DC shift in the measured voltage when no probe is connected or if the input is shorted external to the unit.

When I select GND from the CH1 or CH2 settings, it *does* go to zero.

It would be helpful if there was a way we could adjust the input settings to compensate for this error.  I know I can change the level and shift it down, but then the measurements (the numbers displayed on the screen) are incorrect.


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Post time 2019-12-5 11:50:34 | Show all posts
Please perform Self Calibration.

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Post time 2019-12-7 15:32:18 | Show all posts
I should add that between turning on the oscilloscope and starting the "Self calibration" procedure, it should take 20 minutes for the oscilloscope to warm up.

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Post time 2019-12-10 16:47:13 | Show all posts
What is the firmware version of the oscilloscope? Can you upload an operation video so we can reproduce the problem?
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