How do I extract time from DAQ Assistent?

[mattias@hv]

Hi!

I've done an application acquiring two voltages using the DAQ assistent.

Everything works fine. Now I would like to extract the time for each sample,

how do I do that? The output from the DAQ assistent i DDT. If I save the

DDT-output directly to an lvm-file I get the time correctly. But I would like to

extract the time and use it in my software.

Thanks for any help!

Regards,

Mattias Ottosson

[DFGray]

Try the from DDT express VI from the Express->Signal Manipulation palette (LV8.0).  This should convert it to a waveform, at which point you can extract the t0 and get your time.

[mattias@hv]

Thanks for your help. So if understood correctly I will get td and t0.

Is there any way to get the time for each sample, or should I just create an array

of timestamps starting at t0 and increasing by td? Using this way I must assume

that each sample is sampled with the same td, is this true? I use the DAQ assistent

as: Acquisition mode = N samples, N=100, Samplingfrequency= 1kHz. USB-6009.

Thanks again for your good help.

[Jimmie_A.]

Hello!

Yes you can assume that it has the same dt between each sample since you have a clock on the device that controls the acquisition (24MHz timebase if I am not mistaken).

The picture below shows how it can look like when extracting the t0 and dt in LabVIEW.

[mattias@hv]

The solution seems very easy when you know how to do it 🙂

Thank you for your kind help.

Regards

Mattias