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EM64XX THD issue in Meter display and through communication.

EM64XX THD issue
 
        Goals and Symptoms   

        Summary
        EM64XX THD issue in Meter display and through communication.
 
        Symptoms
        The EM64XX power meter shows current THD% as ----in the meter display and -999 through communications.

        Causes and Fixes       

        Cause
        1. When the secondary current is less than and equal to 10% or greater than and
            equal to 110% of CT ratio.
        2. When frequency is greater than 65Hz.
 
         Resolution
          In order to get the THD reading proper we need to maintain

          1. Secondary current should be greater than 10 % and should be less than 110% of CT ratio.
          2. Frequency should be less then 65 Hz. 

           All the necessary information is available in User Manual and QSG.
 
 
 
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