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Edited by gf1 at 2019-3-12 03:21
I do not see a statistically significant difference with open inputs and 50 Ohm terminated inputs. The resulting offsets vary anyway when I run the calibration multiple times in sequence. And after a calibration run, the residual offset is not invariant either, for each channel, but varies with the set of enabled channels, V/div, time/div and bandwidth limit setting.
[ It were certainly not the best idea, though, to keep the probe connected and to short the ground lead to the probe tip, since this "loop antenna" may pickup noise from the environment. ]
gf1
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