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doubts in calibration of energy using ad7755

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benag6

Newbie level 4
Hi friends,

I have few doubts regarding with calibration of energy values using AD7755.

I got the following measurement values. Can any one check and suggest me whether What I did is right or wrong.

Line voltage:220 v ac.
test current(lb)=2A

CT ratio is 1:2000
As i am getting the pulses values from CF pin.I made following settings
1. scf=0;s0=s1=1
2. gain=16

Obtained voltage at v1p=5mv;v1n=5mv; burden resistance=5ohms and 5 ohms center connected to ground.

By calculation,
I did the following

cf=0.888*(220*2) =~.4hz

to find v2,using formula given indata sheet:

v2= 0.4*2.5*2.5/(10mv *16*13.6*8.06)
v2=142mv

I do get the pulses at cf pin.

with regards,
:roll: nakkeeran

gorkin

Hello brother!
What happen? Your design work with the datasheet calculus exibitions? Your need the get the data from ADE7755 chips and by following the microcoontroller Your must integrate de instanteneus power, then You have the energy ok?
I have code samples and other application notes when I work in similar project...
gorkin

lutrue0410

lutrue0410

Points: 2

benag6

Newbie level 4
Hi friend,

As i mentioned i do get the pulses but I like to confirm with experts whether the calculations i made are right or not.

Also what u pointed out is right, I thought of interfacing an mcu(avr) for capturing the output pulses. Do send me ur application notes for AD7756.

with regards,
nak

lutrue0410

Points: 2

lutrue0410

lutrue0410

Points: 2

lutrue0410

Newbie level 2
Hello brother!
What happen? Your design work with the datasheet calculus exibitions? Your need the get the data from ADE7755 chips and by following the microcoontroller Your must integrate de instanteneus power, then You have the energy ok?
I have code samples and other application notes when I work in similar project...
gorkin

Hi, gorkin. i am implementing the AD7755 energy meter right now, may i have your code samples and other application note?
Thanks.

abhichaotic

Member level 1
Hello brother!
What happen? Your design work with the datasheet calculus exibitions? Your need the get the data from ADE7755 chips and by following the microcoontroller Your must integrate de instanteneus power, then You have the energy ok?
I have code samples and other application notes when I work in similar project...
gorkin
Hi gorkin, I'm also doing the same project and need to interface ade7768 with my pic18f4620, please provide me your code samples, you can also mail me at lovey.abhinav@gmail.com

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