# please for any one know ?

Discussion in 'General Electronics Chat' started by u-a-l, Jul 4, 2010.

1. ### u-a-l Thread Starter New Member

Jun 12, 2010
27
0
i hope to answer me at the earliest
i need simple circuit that i can used it to measure amplitude and phase angle of sinusoidal wave (i now their are some IC's can measure phase but i do not now how i used )
NOTE : { i need amplitude and phase to calculate first , second, thread &....... harmonic of sinusoidal wave }
so if any member have information about my quotation send it

2. ### Ron H AAC Fanatic!

Apr 14, 2005
7,050
657
A true sinusoidal wave has no harmonics. Do you mean that you need to measure amplitude and phase of each harmonic of a more complex waveform? If so, how do you plan to separate it into its harmonic components?

3. ### russ_hensel Distinguished Member

Jan 11, 2009
820
47
A single wave has no phase, phase is a relative measure.

4. ### t06afre AAC Fanatic!

May 11, 2009
5,939
1,222
What you need is perhaps a lock-in amplifier. A lock-in amplifier without the "lock-in" part is not so hard to build. A better word for the latter is perhaps a "synchronous detector"

5. ### u-a-l Thread Starter New Member

Jun 12, 2010
27
0
u are right i have been mistake about sinsiodel waves i mean non sinusoid or complex waves .
i need to determined the consist of complex waves
(a)- fundamental wave
(b)- a number of other sinusoidal waves whose frequencies are an integral multiple of the fundamental or basic frequency like 2f,3f and so on
after all that i want to display it [harmonics]
all that by using PIC 16fxxx

Dec 5, 2009
5,201
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7. ### u-a-l Thread Starter New Member

Jun 12, 2010
27
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how i get f(t) if i don't now the equation of complex waves

Dec 5, 2009
5,201
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9. ### debjit625 Well-Known Member

Apr 17, 2010
790
186
This is how it goes
1)You can measure amplitude of a sine wave with Oscilloscope,ya with IC also I did it using a mcu but I dont rem.. any ASIC for this but their should be.
2)You can measure phase between two or more AC signal in a circuit i.e two or more sine waves ,it can also be done with Oscilloscope.

3)You get harmonic of sinusoidal wave only in mixed ac signal i.e mix of different ac signals and to measure these things you need spectrum analyzer.

Good Luck

10. ### u-a-l Thread Starter New Member

Jun 12, 2010
27
0
thank u i will read it now
sorry i have anther quotation not about harmonic but about power factor if u have ways to measure it using pic ????

11. ### Ron H AAC Fanatic!

Apr 14, 2005
7,050
657
Google "FFT on a pic". FFT stands for "fast Fourier transform".