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Interesting, I am having exactly the same problem with some 6074BE scopes and was about to send an email to the support when I saw this thread.
In the manual, it is stated that all probes must be removed from the input before calibration (as it is normal in all oscilloscopes that I know off) but, in the software, in the Calibration windows, it says that you should short the inputs to ground and then run the calibration. So I decided to try that and apparently it solves the problem but after a while the offset problem returns.
My questions are:
1) Is this a hardware or software related problem? And how to fix it?
2) What is the correct procedure for calibration? The one described in the manual or the one in the software menu?
regards.
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Post time 2019-3-10 07:21:53