Hey hi everyone,
Can anyone clear me about my this doubt that what is role of CF in ADE7763.
and also help me to give me detailed information about CFNUM,CFDEN.
and how it's useful in Active power calibration.
The role of CF is to provide a convenient way to calibrate and verify meters. The CF pin of ADE7763 can be programmed to output a signal whose frequency is proportional to the active power, under steady load conditions. Many users also use this frequency output for billing purposes.
CFNUM and CFDEN are scaling registers that can help to adjust and set the CF frequency to a wide range of values. These are unsigned 12-bit registers.
The DFC in the above figure is the Digital-to-Frequency converter, which generates the CF output based on the value accumulated in the AENERGY register.
Kindly have a look at page 29 of the datasheet where all these concepts are explained in detail.
If a reference meter is used to calibrate active energy, then you will need a CF pulse output. If an accurate source is used, then the energy register readings (line cycle accumulation method) can be used instead of CF pulses, for calibration. Starting from page 35 of the datasheet, you can find a section allotted solely for describing calibration steps, in both these scenarios. Some examples are also provided, which will help you along the way.
Let me know if you have any further doubts or if anything is unclear.
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