NI 9237 DSUB Excitation Voltage

[dsciarr]

Our client specified a NI 9237 card (the DSUB connector version) and would like the excitation voltage input to be variable.

They want to source a variable 0 .. 24V power supply to drive this excitation input.

Question #1: Is this normal? I've only ever seen 10V excitation.

Question #2: Would it be possible to have a fixed power supply, say 24V, and to use a potentiometer to dial in an excitation voltage?

[Antoniooh]

From the specs:

External ecitation for NI-9237 goes from 2V to 10V

[dsciarr]

Yes, now onto question 2, is it feasible to drive the excitation line with a potentiometer so a range of 0..10V is accomplished?

[Antoniooh]

I don't recomend using a potentiometer.

I would rather use a variable power supply.

If you are willing to add a potentiometer to the circuit then go ahead and add a proper variable power supply.

[santo_13]

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@dsciarr wrote:

Yes, now onto question 2, is it feasible to drive the excitation line with a potentiometer so a range of 0..10V is accomplished?

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I would recommend a potentiometer along with voltage follower using OPAMP to derive this 0-10V supply. But, why 24V and why variable?