EDIT: Updated information on the bug here.Ok, the measurement bug can be invoked by
re-selecting measurement items. At first I thought it was started by the screen-saver, but in fact, it can be triggered by just
leaving the DSO turned on re-selecting measurement items.
To test for it, do the following:(Re)Boot the DSO.
Send DSO a test signal with very different rise and fall times (e.g. sawtooth wave).
Select Rise and Fall measurements from left-side menu.
Confirm they are different.
Delete the measurements.
Leave DSO and return in 10 minutes.Re-select Rise and Fall measurements from left-side menu.
Confirm they are now the same.
(Optional:) Turn on other measurements to confirm that there are other errors (+duty, frequency, etc).
First image taken just after reboot:Second image taken after deleting and re-selecting measurements: