Hello,
I think, I was able to reproduce the issue.
My setup:
PSU Rohde & Schwarz NGB 32/10
- voltage set to 0V at the beginning
- CC limit set to max (10A)
Load: 2.2 Ohm 50W resistor
DMMs used (left to right):
- EEVBlog BM235, measuring the voltage
- Agilent 1252B, measuring the current
- EEVBlog 121GW (Firmware 2.04), set to VA mode
I have increased voltage output until the current was around 2.6 Ampere.
Because of the self-heating of the resistor the current begins to drop. During this time I took the pictures below.
One can see, that the current measured by the 121GW in VA mode is clearly higher than the current measured by the 1252B. When the current drops below 2.49 Ampere the current shown by the 121GW is agreeing with the 1252B.