PXI-6255 voltage limit

[Veristand-user]

Hello,

I need your help for a signal acquisition : 12 inputs in 0-16V.

But the voltage limit for the most of the PXI cards is [-10V;10V]

I know that some cards like PXIe-4300 can measure more than 16V, but they less cost-effective.

Can make a differential mesure on a PXI-6255 to measure 0-16V ?

Thanks for your answer

[crossrulz]

The short answer is no.  The reason is that each input, even in differential mode, can only handle a range of -10V to +10V relative to ground.

What I have done in these situations is use a voltage divider (2 resistors that will divide down the voltage) and then apply a scale in DAQmx to make the scale back to what you expect.  Since you are dealing with a range of 0 to 16V, I would just use 2 100kOhm resistors to divide the voltage in 2.  This would give an input range of 0 to 8V.  Then setup a scale in DAQmx to multiply the read voltage by 2.

[Veristand-user]

Hello,

I forgot to answer you Crossrulz

Thanks for the advice, I will do it this way 🙂