AC voltage measurement

[MARWEN007]

hello, I want something conprendre conserne measuring an AC voltage is 400 V was based 16F877 then I'll post it on an LCD, after a little research on net I found this formula it wa

**broken link removed**

with
N: number of samples
Ui: sample value i.
good I want someone to explain a bit with knowledge in electronics
This formula is used to measure the effective value of a variable voltage or not??
whether the value measured by this formula is not the real value of tension is what I will multiply rapprort division transformer bridge and go to the pure real value?
Please can someone explain to me one!

 

[andre_luis]

MARWEN

The effective value is also called the RMS value of waveform.
This is what is needed to heat a linear ( and not reactive ) load.

Note that Ueff -> ( U^2 ) is linearly proportional to Ueff/R -> ( (U/R)^2 ) wich is the formula of power consumption of resistive load.

+++

 

[MARWEN007]

but how am I going to measure an AC voltage to an RC you have an idea?

 

[andre_luis]

Sorry to ask, but what is target application ?

 

[MARWEN007]

hello, I want something conprendre conserne measuring an AC voltage based on a 16F877 and I'll post it on an LCD, a voltage is 400V MAX




good I want someone to explain a bit with knowledge in electronics
This formula is used to measure the effective value of a variable voltage or not??
whether the value measured by this formula is not the real value of tension is what I will multiply rapprort division transformer bridge and go to the pure real value?
give me the basic points to measure tension via a 16F877 and found an acceptable image
Please can someone explain to me one!