how to program to acquire pressure

[jastel]

Okay so I am new to this. I need to write a program for acquiring pressure, is it possible there is a vi. already created for this and I am missing it. or can anyone point me in the right direction. Basical I have a Varian smart gauge that send a volt from 0-60mV for a torr readung or something like that. any ideas

[Dennis_Knutson]

"or something like that"?

First thing to learn is your measurement device. Everything is in the details. If your instrument is outputing a dc voltage than you need something to measure that with. Perhaps an NI DAQ card and there a lot of examples for using those. If the instrument has a different interface (i.e. serial), determine that. There are numerous examples of that as well. 

Have you searched the forums for 'Varian'? I did and found several posts. Perhaps one of them pertains to the model you are using (which you have not provided or a manual).

[jastel]

So i am using a Varian 921-0066 Multiple pump control, It reads the pressure then uses diode characteristics to change that to a voltage, from 0mV to 100mV, that can be sent out to a device to record. I have set up a DAQ assistant to get that voltage and that works fine. My problem is I need to convert that voltage back to an atmospheric pressure (torr). I can't find anything online or in the book on doing this.

[Dennis_Knutson]

I can't find anything either with a quick Google search. You did not post the manual to get another set of eyes to look at it. Unless someone with experience sees this post, you need to contact Varian on how the voltage is scaled to pressure. Once you have that information, you can create a custom scale in the DAQ Assistant.

[jastel]

So its not letting me post the manual, so here is the link, page 18 of the adobe file is what i am talking about.

ftp://ftp.varianinc.com/public/outgoing/VT/(D)%20Ion%20Pumps/921-0066_Multiple%20cPump%20Control%20U...