9237 Shunt Cal operation

[Eric_Lang]

Hello,

I am attempting to perform a shunt cal with on the 9237.  I have built a simple FPGA vi that appears to be functioning - I can change sample rate and perform an offset cal.  However, when I activate the shunt cal switch, the output does not not change.  I noticed in the wiring schematic SC pinouts.  Am I to connect these in some manner? (No explanation is given as to what they mean as far as I can see).  My understanding was that the 100k Ohm resistor is internal to the board and that I need not connect anything externally.

Any ideas?

Thanks!

[Wayne.C]

My understanding is that depending on which version of the 9237 you have ( DSUB or RJ-50 ) you will need to connect one or both of the SC's directly to the bridge.  This is because one of the reasons to perform a shunt cal is to compensate for wire lenghts.  Look at figure 3 in the docs for the 9237

[J-Barticus · Accepted solution]

Hi,

Wayne.C is correct regarding the SC connecting to your sensor. Below I have provided a link to the NI 9237 specification document, reference page 10 (figure 3).

http://www.ni.com/pdf/manuals/374186e.pdf

-Jake B.

[Eric_Lang]

Guys,

Thanks for the info.  I've tried it and am successful in controlling the shunt.  Perhaps a paragraph in the Operating Instructions that discusses proper connection would clarify better....

Thanks again!