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RMS results

Question asked by Dave on Nov 19, 2009
Latest reply on Nov 23, 2009 by JeradL

Hello,

 

I have recently received the ADAU1761 evaluation board.  One thing I have noticed is that the RMS results using the RMS squared envelope and then the square root function work fine for frequencies above 50Hz.  When I try an input frequency of 2Hz using the tone input, the results go up and we end up with a 30% error.  I have found that if I can the TC of the envelope down to 5, reults are beeter with a 2% error.  The problem with that scenario is the response time of the function.  Changing the sampling rate did not affect the results either.  Any suggestions will be appreciated.

 

Thanks.

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