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number of samples

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number of samples

Postby cristina » Mon Apr 04, 2005 3:13 pm

I want to register in picoscope a signal from a generator with a definite frequency. After that, i take the signal to matlab to make with it a fast fourier transform. My problem is that i can´t specify exacly the number of samples in Pico, that means the time between samples is different from what you espected and therefore this fact changes your Nyquist Frequency if you want to make an analysis in frequencies.
What can I do?
thank you
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Postby Sarah » Tue Apr 05, 2005 10:10 am

Hi Cristina

Thank you for your post.

The only way you can specifiy the number of samples is to either set the number of samples per scope trace in the advanced settings options, or use Picolog.

I would advise that Picolog is the easiest way to set the number as Picoscope may still have to change the number slightly.

The other option would be to write your own software to acquire the data.

Hope this helps

Best Regards
Sarah
 

Time Between Samples

Postby Autonerdz » Tue Apr 05, 2005 3:51 pm

Hi Christina,

You might find the sample rate calculator I have useful for calculating actual sample rates as well as time between samples for various settings of samples and screen time. It's accurate to within a few samples. You can find it here:

http://www.autonerdz.com/java/SampleRateCalculator.html
Tom Roberts
(The Picotologist)
http://www.autonerdz.com
skype: autonerdz
THE PicoScope Automotive Authority
In North America
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