Help With A Little Project

[jeanninemtv]

I NEED TO MEASURE THE RATIO BETWEEN IN AND OUT MEASURED BETWEEN A POWER TRANSFORMER ...
 
I THINK I WILL USE A PIC, BUT I HAVE A LOT OF PROBLEMS ABOUT CONDITIONING THE SIGNALS  (1 ...  10 KV- 220v  AC) TO THE "innocent"  pic analog channels.
 
can anyone of us help me?
 
:confused:    :eek:  :p

[Yazi]

I think I can help you just waite

[jeanninemtv]

thanks, ...  i need the signal conditioning part, the microcontroller part is easy on basic!!
 
i dont know how to handle the KV and 220 V and put it to measure in / out with the lowest error possible
 
.... thanks my friends!!

[Yazi]

it work fine in hard in one of my old projects
measure of rms value of the input Vin ,rms value Vout and display it on LCD 2*16
software with hitech 8.05, IDE MPLAB 6.40
enjoy:)

[jeanninemtv]

thanks, i think i can do the program for the micro by myself on basic...
 
but i need some help about howto make the conditioninng stage for the AC measurements ...   220V in one side of the transforemr and 1KV on the other side ....  ratio=  1KV/ 220 = ****

[Yazi]

the sensor used in my designe is calculed for 220v, you can make a big resistance for 1kv, for the output you can use the same sensor (150k+100 k)*2 + 5k but for 1kva use multiplication by (1000/220) if you love your pic

[alejandro]

it´s important you make your high sensor resistance with a chain of  resistor but not only one of great value to measure 1 kv. I used 6 resistors in series of 1 MOhm/1W and a preset of 100K with the cursor to the pic and a C of 1uF 25V.

[jeanninemtv]

hasanyone any schema?   it s possible to simmulate on proteus any stage???

[picstudent]

interesting, but i have no idea at this moment for acconditionating