Search found 15 matches

thanks all.
I somehow managed it.
I check ADC samples of voltage. If they are at zero cross point (+- 10 of 512 count DC Ref),I store current I adc samples count.
If voltage sample counts (5 cons ...

thanks.
I have value of cos(phi). Issue is its sign - inductive(Lag PF) or capacitive(Lead PF). I don't know how to get it as my KVAr is always +ve as it is derived quantity(square, subtact then sqrt ...

Hi all.
I am working on a project where I have to display electrical parameters like KW,KVA,KVAr & PF Power Factor. I can measure instantaneous Power KW and Apparent rms KVA & Derive reactive ...

Thanks everyone for valuable thoughts.
I am using the 1V ref. sine to multiply fundamental current(from peak detector) so that I get fundamental current which will give phase shift error from load c ...

thanks asmboy & Mike Walne,

what is the application? - generating 1V ref. voltage synchronous to input utility voltage which has changing amplitude & frequency. But Generated Ref. signal sh ...

Hi all,
I am planning to produce a ref. 1Volt sine signal syncronize with voltage Zero Crossing.
I am using PIC16F72 & MCP4821 DAC, CCS 4.020.
I am able to generate sine wave using LUT with 12 ...

thanks for reply dear FvM & Sherpadog.
I am thinking that once I can find THD of V or I,though slow updated at start( once in a sec.)but will be my first step towards the goal.After that I ca de ...

How will this relate to CCS and the PIC? What PIC are you planning to use?

Friend, is PIC & CCS is must? I think I have asked generic question on digital/analog filter which required straight f ...

hi all,
I am working on a project where I need to show total harmonics distortion of voltage and current signal.
Currently I am taking 32 adc samples of voltage and current in a cycle(20 ms) of 50 ...

hey Franck26,
Restarting your old topic. Currently I am facing same problem with timer3. It has to update on every 1 ms. But after 1 day, 2 day or 30 days its value changes and starts giving interr ...

Thanks FvM & languer for your quick & valuable response.
I have 5 EEPROMS(A0,A2,A4,A6,A8). Of which I start data logging from 2nd A2 to 5th A8. I check the address before write the data. If ...

hi all,
I am working on a energy meter project with MAXQ3180, PIC18F6722 and 4.020 CCS compiler.
I want to store the data from energy meter to 24C64 EEPROM (5 no.s)which is connected through i2c. I ...

Hi kranthi kiran, I'm also working on maxq 3180 AFE. I am able to communicate, read virtual registers correctly and can dispaly 3 phase V, I, PF, power and energy, but not able to work with harmonics ...

Thanks for reply.
As I use 16F877A, low memory problem is there to remain. But is there any other way I can write the code so that I can take 3*32 samples of 10 bits and work around?
With 8 bit prog ...

hi friends,
I am working with a program which measures three phase current (2.5V DC shift). I am getting accuracy of 5% to 7% with internal 8 bit ADC. If I try to work with 10 bit ADC, get an low RAM ...