Collecting the trigger frequency from a VME-bus integrator.

[jchomel]

The integrator gives result ( result = (VFC - offset/4)/50000 )(in V.s), calculated from VFC value and offset value, read in padr ( Port A Dtat Register ).
I'd like to know the real meaning of both offset and VFC value. With it, I should be able to know real-time frequency, without fixed input voltage.

[Trey_Hamilton]

jchomel:

What integrator are you using? Is this a software function that gives you this "result"? I'm a little confused as to what exactly you are trying to do.

Trey Hamilton
National Instruments
Applications Engineer
http://www.ni.com/support

[jchomel]

I'm using VMEbus Integrator AT 680-2030-050.
"result" is given by technical specifications.
I'm just looking for a few documentation on this topic : how is working an integrator ??

[Trey_Hamilton]

I apologize, but I am still unclear on what exactly the AT 680-2030-050 is. What company manufactures this? Does it have a part or model number?

Trey Hamilton
Applications Engineer
National Instruments
http://www.ni.com/support

[jchomel]

I do appreciate the attention you show toward my problem. So here is what I know :

The Integrators I'm using are specialy built by National Instrument for CERN/LHC.
They supply Voltage mesurement (*in Volt.Second, that's why I was a little bit dippointed) whith 2 32 bit words : one for voltage integerating counts and one for the "offset" .ie. the time elapsed since last mesurement. I didn't know this last was only in us. Now it's ok. I'm always expecting for documents on that topic.

Regards.