I want to compare a sign wave and a square wave. What hardware/software will I need?

[Brad22]

I need to compare relationships(sincronicity) of two signals in real time. I have the latest LabVIEW Full Developement SW. What sort of hardware will I need? Cost is a big issue.

Thanks,
Brad

[locma1]

Ist hier irgend ein deutscher LabView benutzer ?
Is there anyone german Labview-user ?



"Brad22" schrieb im Newsbeitrag
news:50650000000800000073340000-1005954886000@exchange.ni.com...
> I need to compare relationships(sincronicity) of two signals in real
> time. I have the latest LabVIEW Full Developement SW. What sort of
> hardware will I need? Cost is a big issue.
>
> Thanks,
> Brad

[CraigGraham]

vi.lib\Measure\maspectr.llb\Cross Spectrum (Mag-Phase).vi may help.

As for hardware; depends on frequency! You need a DAQ card with two input
channels capable of reading those two channels at a frequency double that of
your signal. If the signal is strong against background noise you can save
money by getting a low resolution (not many bits) card.

Alternatively you could buy a dedicated spectrum analyser, again where the
price will be determined by frequency. Make sure the spectrum analyser can
do a "transfer function" measurement and you can use that to give you the
phase between the two signals. Phase is more appropriate than synchronicity
since one cycle is not distinguishable from the next; hence for a signal at
a frequency of 1Hz you can't tell the d
ifference between a lag of 0.5s
between signals and a lag of, say, 3.5s.

I suspect the DAQ card and software approach will work out cheaper than the
dedicated instrument.

Brad22 wrote in message
news:50650000000800000073340000-1005954886000@exchange.ni.com...
> I need to compare relationships(sincronicity) of two signals in real
> time. I have the latest LabVIEW Full Developement SW. What sort of
> hardware will I need? Cost is a big issue.
>
> Thanks,
> Brad

[Brad22]

My frequency range is from 65KHz to 75KHz. Thanks