Sorry for disturbing here, but I would like to continue in "my" thread...

Seeing the last discussions here, I´ll tear off the meter first before doing anything else.
Will be done "tomorrow", today in the evening, I´ve open it up - Only 2 screws, nice...
Pics will follow, one thing first:
It seems it is the same as the 4401, only a question of software what the testfrequencies concerns.
First look, it doesn´t got any special things, no "chipset" like the DE5000 for example got.
A st32 controller and memory is what I´ve saw on the pcb and "lots" of op-amps.
So this weekend the way is clear, taking detailed pics of the pcb, measure the testsignal via scope for frequency, level and what the bias thing takes an effect.
Martin