Hi Everyone,

I am not able to understand how to convert the VRMS 24-bit register value into actual Vrms voltage.

Currently if i consider all default settings of ADE7763 values.

if I am receiving max. approx. VRMS Register value 1,561,400 d (0x17 D338).

then how can i make the calculation to represent this value in actual Vrms value.

considering V2P-V2N is 0.5V.

Please help me to understand this.

In actual experiment I am giving AC 0.302V at V2P-V2N (no load at V1P-V1N); I am receiving 0x174173 (last 4173 is fluctuating) from VRMS register.

what could be then actual VRM value.

Regards,

Umesh

Hi umeshwalkar

For RMS gain calibration, you need to find the Amps/LSB(or Volts/LSB) constant and store it in your microcontroller for converson of register values to 'real-world' RMS readings.

To find the constant:

1.Apply a known value of current/voltage to the channel and note down the corresponding RMS register reading.

2. Now divide the current(or voltage) value by the RMS register reading to get the Amps/LSB(or Volts/LSB)constant.

After this point, you pretty much can know the actual RMS value based on the register reading alone.

Regards

hmani