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Category: Hardware

When I try to measure a pulse at CF output pin , I find a distorted pulse and it is constant even in the absence of load.And F1 F2 output also provide the different distorted pulse

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Schematic

Input signals / sensors

Measure all the pins to gnd

Can you capture the cf pulse so I can see the distortion

Dave

• I find same frequency pulse on CF and F1 F2 . How can I calculate energy using ADE7757 • https://www.analog.com/media/en/technical-documentation/application-notes/AN-679.pdf

The basic idea is you need to determine your impulse/KWH know as the meter constant.

Once you know the meter constant  you need to set s1,s0 and scf.  for the desired range.

Then you adj the voltage divider on the voltage channel to calibrate the CF pin to the expected freq with a specific load.

You will need to use reference meter or accurate source to calibrate the ADE7757

Dave

• How can I determine meter constant?? And how to interface it with Arduino or esp32 to get energy and display it on lcd. If you have any reference sample code ,plz share....

• meter constant is determined by you.

the esp will count cf  pulses and multiply by a constant and display

I do not have code for this since this is using the esp to count pulses.

I would use a IRQ to count the pulses

Dave

www.analog.com/.../AN-679.pdf

• Have gone through the note but unable to get desired results. If u have any pspice simulation model plz share or any circuit diagram to calculate maximum current upto 10A...

• this equation calculated the f1 f2 freq with a given set of inputs on v and I. Note you will need to calibrate using a v and I of a known value.

this table shows the ratio of cf to f1 f2 freq.

cf will be 16,32,64,128 or 2048 time faster that the f1 f2 based on the table and scf s0 and s1 https://www.analog.com/media/en/technical-documentation/application-notes/AN-679.pdf

substitute your values on pg 3 to start. pick whatever imp/kwh you want or just use the

Meter constant = 1600 imp/kWh that is defined in the doc.

Dave

• this equation calculated the f1 f2 freq with a given set of inputs on v and I. Note you will need to calibrate using a v and I of a known value.

this table shows the ratio of cf to f1 f2 freq.

cf will be 16,32,64,128 or 2048 time faster that the f1 f2 based on the table and scf s0 and s1 https://www.analog.com/media/en/technical-documentation/application-notes/AN-679.pdf

substitute your values on pg 3 to start. pick whatever imp/kwh you want or just use the

Meter constant = 1600 imp/kWh that is defined in the doc.

Dave

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