Dynamic Signal Acquisition

[PeterdB]

Hello,

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?

Thanks,

[WillPwr]

Since this is a duplicate post, let's handle it here: Can I use a probe with my NI4461 to measure 100Vpp?