Keithley 6514 Electrometer first value extreme slow

[N.Schnitzler]

Good Morning, 

i have two Keithley 6514 Electrometer in a synchrotron measurement setup. They work fine, but fetching the first value is extremely slow, especially after changing the NPLC. You can see the initializing here (taken from the 6514_max_speed example found on this board) 

I have also tested the drivers from IDN and Keithley, but they all seems to have the same issues. The time for fetching the first value depending on the NPLC is:

NPLC 0.01 800ms
NPLC 0.1   1.6s
NPLC 1      10s  (further points 130ms)
NPLC 5      50s  (further points 700ms)

Has anyone an idea how to tweak the acquisition of the first point?

Thanks in advance!

best 

Norbert

[cstorey]

TRG: COUN 500 means take 500 measurements. 

I think you are taking all measurements, changing NPLC results in slower response because you are taking 500 measurements with longer period each.

Then you are just reading back each measured data point one at a time faster later in code.. but without the code that's all a guess.

Explain what you want to do, show us the code and we can advise.

Craig