How To Calculate RMS Voltage in VeriStand

[CFEARING01]

I am looking to calculate RMS voltage of a scaled AC 60 Hz waveform in VeriStand. We have 120 VAC outputs connected to a load resistor and are using a current transducer to output a scaled analog voltage into a NI-9205 module. In VeriStand I am getting instantaneous values but would like to calculate RMS voltage and then threshold it to detect binary on/off of these outputs. In the calculated channels I see an option to do an average with n samples, but this is not helpful for a sinusoidal waveform.

[joshe]

The easiest way would be to just buy and RMS transducer.

https://www.crmagnetics.com/ac-voltage-transducers/true-rms/single-phase/cr4511 

for example.

Otherwise you are going to have to develop a model to find peaks and take the sqrt of 2.

[thumble]

The better is to compute the RMS in the CRIO FPGA. If you need high precision the better is to use a sine interpolation computation. If you can't, you have to do the same in a VS model.

HAGD