When going through the StudentZone May 2018 material, I found that I could not match the waveforms measured and went to investigate. I found the following strange behaviour, with no leads connected:
- ALM1000 Oscilloscope running, AWG's configured according to the training material, curves CA-V and CA-I visible:
Looks what you would expect, except maybe for the "not very straight Square wave".
- Next, when I turn on curve CB-V as well, the trace of CA-I changes dramatically:
My ALM1000 is Rev. F, so I would expect it to be calibrated. It seems like some stray capacitance is introduced by switching on the CB-V curve?
Can someone please advise, is this normal behaviour, does my unit need (re)calibration? Please help.
[edited by: MartijnSc at 11:36 AM (GMT -4) on 31 Mar 2021]