Hi there,
I am a Hameg collector and I mainly collect the old HM80XX series. In this series there are some devices of the last generation (Hm8012, Hm8015, Hm8018) in which the calibration routine is initiated with a combination of buttons when switching on (hold down two buttons at the same time when starting the device).
With the HMP4040, the firmware update is also initiated in the same way. Maybe there is such a routine here too?
Has anyone experimented with it yet?
I have a HMP4040 too and there is also a smal (but anoying) error in the mesurements.
With the HM8012 you then have to select a measuring range, apply a specified reference value (e.g. 5,000V) to the terminals and then save this reference value as the new reference value for this measuring range by pressing a button.
Marc