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ADE7758 Wrong Frequency/Period Measurements

Question asked by Ivan-Rusov Employee on Sep 30, 2013
Latest reply on Oct 2, 2013 by dlath

Hi,

 

I have a request described below.

 

Strange situations occurs when ADE7758 measures line frequency. Power lines (220 V, 50 Hz) are connected to IC as datasheet describes it.

Chip parameters are following:

1. FREQSEL=0 (in LCYCMODE).

2. PERIOD is read once per second.

 

More frequently PERIOD value is 0x0320 (that is 50,00 Hz). But ones per 300-500 times PERIOD value becomes 0x0300 (that is 48,00 Hz). Active Energy is monitored quite good.

 

Could you please help to resolve this issue? What could be wrong? Any recommendations would be great. Thank you in advance.

 

Regards,

Ivan

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