I use a NI4461 card with 2 input and 2 output channels. I have a signal generator with a 100Vpp 125Hz signal that I would like to characterize using labview (FFT, amplitude etc).
As the input limits on the NI4461 are +/-42.4V, I was hoping to use a 10X probe, similar to a scope.
However I find this not working correctly as the probe attenuation does not seem to be a constant 10x. Although my scope (with a second probe) reads 100Vpp, my NI4461 only detect 82Vpp.
Am I missing something? Are there other solutions to read >42.4V signals on the 4461 than using a probe?
I checked and swapped probes and they both work find on the scope, just not on the 4461. Is there a special probe that has a good impedance match for the 4461 that one can recommend?