RMS current reading with a CT

[savage67]

hi,
I need to measure RMS current of 50 hz signal.
I have a low frequency current transformer.of course, there must be an analog circuit with the transformer. do you know any topology?
Thanks.

 

[srizbf]

if the current is sinusoidal then have a peak detector in th sy
and calculate rms from peakvalue.

srizbf
25thjune2010

 

[savage67]

it is not pure sinusoidal. there is a third harmonic.
so i must use an analog circuit to measure rms.

 

[srizbf]

then search for 'true RMS ic' from 'analogdevices'

srizbf
25thjune2010

 

[FvM]

If you want to build your own RMS detector circuit for some reason, take a look at this National application note:
**broken link removed**