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Original question:

High precision signal path with digital post correction

ADC linearity resolved - new RMS measurment problem

max3031
Prodigy 110 points

Hi,

I think that the issue regarding ADC and linearity is resolved.

Now I have a new problem with real measurement task:

I need to calculate RMS of the voltage signal that is in the form of the square-waves of certain frequency (10 to 15Hz). The problem is because my system is sampling this signal at the constant rate 128Hz so I am basically doing non-coherent or asynchronous sampling. Because of this RMS calculation has errors. So what would be the correct way to resolve this? I would like to measure this precisely in short time period, for example after taking 200-300 samples.

By the way i can't synchronize my system with incoming signal. Not possible in hardware. So all corrections need to be performed by software.

Regards