NI 9237 module - scale data from FPGA

[kosist90]

Dear LabVIEW community,

let me, please, ask you a rookie question.

I've got measurement of Full Bridge transducer, using NI 9237 with cRIO. NI 9237 measurement is implemented on FPGA side, so on real-time part I receive data, and send it to host.

Transducer sensitivity is 2 mV/V, excitation voltage is 5 V, range 0... 10kN.

1. Does NI 9237 module really returns values in mV/V? I've found this info on the forum, but when I check examples, it seems, that it returns V/V. Where is the truth, please?

2. Is excitation voltage somehow influence on data scaling? Currently, I understand sensitivity 2 mV/V in a way, that each change of 2 mV/V means change of force on 1 N. So, if I measure 100 mV/V, then it is equal to 50 N. 

Is it correct, please, or I'm missing something, and need to take into account excitation voltage + sensor range (0...10kN)?

Thanks a lot in advance,

Sincerely, kosist90.

[Artem.SPb]

2 mV/V means that if supply pover = 1V, you'll get 2mV
for 5 V it will be 10 mV etc.
For relation between 2 mV and force see sensor manual.

About V or mV can't say. I worked with this modules many years ago. May be it can be configured. I used to calculate for getting force from RAW.

[kosist90]

Thanks a lot!

I've found also this link - https://www.hbm.com/en/3638/sensitivity/, which tells the same.

And seems, that NI 9237 returns V/V, although output range is -25 ... 25 mV/V.