TRUE RMS voltage measurement

[Salunke D.V]

Hi All,

We want to measure 0-500VRMS using Texas MSP430F2013 microcontroller.So how to measure this AC rms voltage using sigma-delta ADC of the same controller?

Regards,

Salunke

 

[viswanathk]

hi Salu,

step 1: U need to convert the 500v to ADC specification level, for that u need to use a resistor network bepends on step size --fullscale to read.

step 2. then u need to read the samples and then depend upon accuracy of ADC u need to calibrate to giv u accurate value.

 

[goshka]

https://en.wikipedia.org/wiki/Root_mean_square