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Picolog frequency measurement problem

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Picolog frequency measurement problem

Postby PaulF » Fri Feb 23, 2007 12:16 pm

I have just downloaded the latest picolog software rev 5.15.6 which I am using with a ADC-11/10 USB & can get no reading when set to measure frequency. If however I use an older version 5.13.4 it works fine. I have tried everything I can think of but can't seem to get it to work. Any ideas?
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Postby ziko » Tue Feb 27, 2007 1:36 pm

Hi I have tried to recreate your problem however it works with me.

Could you send me more information about your set-up and could you send me your .plw file.

Kind regards
Ziko

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Picolog frequency measurement problem

Postby PaulF » Tue Feb 27, 2007 4:13 pm

Thanks for the reply.
I just set up one input channel with measurement as frequency & input a square wave of 2.5v of varying frequency from a signal generator into the corresponding channel, I have verified the signal & frequency with Picoscope but with picolog 5.15.6 I get a reading of 0Hz. If I uninstall 5.15.6 & re-install 5.13.4 & follow the same procedure it works fine.
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Postby Sarah » Thu Mar 01, 2007 9:46 am

Hi Paul

What sampling rate are you using? For the frequency measurement, you need to sample with at least 1 second intervals. Any less that this and it will not work properly. It needs a longer scan time to work out the frequency and 1 second is usually the lower limit.

Best Regards
Sarah
 


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