waveform index 0 of 1 error

[JohnDoe22222]

I am getting "waveform index 0 of 1 error-The waveform dt parameter is <= 0." error from my lab data in page 2 part of my vi, despite adding time channel info.
Can you take a look

[DCKAN]

Hey John,

By observing your data, there are many frequency components with "Inf" tags, which is going to convert to "0" (zero), as 1/Inf = 0, i.e. dt = 0.

When you feed this data to FFT measurement, the algorithm rejects this undefined value and gives error as mentioned. 

Please try to remove those values and then try again, it will work.

Regards,

DCKAN

[JohnDoe22222]

My friend,

Torque and angular frequency are data coming from sensors. Those are required data for my FFT and angular frequency data is different from sampling frequency info.  Therefore I seperated them and used just Torque data for FFT.

However since read from measurement file vi does not read time channel, i cant move on and FFT vi gives me error

How can i use first row of my data file as time channel. Is there a format error in txt file?

[JÞB]

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@JohnDoe22222 wrote:

My friend,

How can i use first row of my data file as time channel. Is there a format error in txt file?

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Crazy scary working with the scan from string and time in an odd format but that should work

[JohnDoe22222]

I still dont understand. How can i get time info from "read form measurement express vi" for my waveform data. It drives me crazy. I can get datas via express vi but cant get time info with data

[JÞB]

The express vi is not general enough to do what you want.

Try this:

[JohnDoe22222]

I added time info with build waveform function by giving magnitude(get from express vi), t0(set it 0), dt(reciprocal of my sampling rate)

I am adding picture of it.

Thank you for help 

[DCKAN]

I have made something that may solve your issue...

Regards

DCKAN