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What is current channel B gain matching using the energy registers on ADE7953 calibration procedure

Question asked by karens on Feb 25, 2013
Latest reply on Mar 5, 2013 by hmani



On my project, I use ADE7953. There are two ADE7953 on each board. Actually we treat one ADE7953 metering IC as a mete with two current channels. Channel A and B are fully independent current channel, connect to different load. For calibration,  I use accurate current and voltage source.


Upon AN-1118 Application Note (Calibrating a Single-Phase Energy Meter Based on the ADE7953), Figure 4 (page 5) and Figure 8 (page 11), to calibrate current channel B energy registers, we must calibrate BIGAIN using current channel B matching procedure. My questions are:


1. I thought BIGAIN is for current gain adjustment, why should I calibrate BIGAIN for active energy calibration?  


2. Does it mean current channel A must be calibrated (including AIGAIN) before channel B calibration since BIGAIN calculation is based on IRMSA and IRMSB reading, is it right? How to calibrate AIGAIN? using equation

IRMSA Expected = IRMSA initial * (AIGAIN / 0x400000)

to calcuate AIGAIN? 


3. What is the primary use of AIGAIN / BIGAIN? Upon AN-1118, there is no internal gain calibration register for the rms readings, and on my application, we read IRMSA / IRMSB / VRMS value for current and voltage measurement. Does it mean I must calibrate AIGAIN / BIGAIN in order to calibrate active energy?


Thank you very much for the help.