Note that "hp-34401a-standalone-software" seems to have some serious issues with the way how it updates the readings.
1. It doesn't check the actual status of HP3478A. It just sends the range switch command without checking the result.
2. The displayed range is updated immediately while it still displays previous readings.
3. In my setup it seriously lags behind the HP3478A. For example, if I switch from V to
, it displays past V readings as Ohms for a good few seconds.
Maybe my 12 year old core i5 CPU is not fast enough to keep up with 40 year old MCU of the HP3478A?