Dont understand Voltage RMS

[Hans-Juergen Lange]

Hello,

I have to write some measurement software  that uses a NI-DAQ 6071E. C++ is used as the programming language and the new DAQmx interface is used and looks fine for the moment.

Now I have some Questions about the two functions 

DAQmxCreateAIVoltageChan

DAQmxCreateAIVoltageRMSChan

Does the first give me the unmodified sampled values?

Does the second make some calculation on each sample?

I must create the arithmetic mean and the RMS of the samples. Do these functions help me on this. Or must I do the calculations on my own?

I would expect that I have to make the calculations on my own, which is not a problem.

Would be great for some advise

BR

Hans-Juergen Lange

[Brad_K · Accepted solution]

Hi Hans-Juergen,

The DAQmxCreateAIVoltageRMSChan() function is only supported for the DMM integrated into the NI ELVIS II and NI ELVIS II+. For the NI 6071E you will have to use DAQmxCreateAIVoltageChan() and perform the calculations on your own.

Brad