Hi,
I'm making a precision pA meter. I found instruments (e.g., Keithley 6430 and Keysight 2985) have PLC synchronization function.
Data are read-out per N times PLC cycles.
I understand if the integration time is perfectly matches N PLC cycles, then the 50Hz (or 60Hz) PLC noise are averaged to Zero.
My question is:
1. Is it possible to precisely match the PLC cycle? or is PLC frequency 50Hz is stable?
How these instruments achieve the synchronization automatically and precisely? (I can't find out from their handbooks)
2. What if the sync is not good, will this effort still reduce the PLC noise error?
Thank you!