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PaulF
Active User
Joined: 12 Apr 2006
Posts: 9
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 Posted: Fri Feb 23, 2007 12:16 pm Post subject: Picolog frequency measurement problem |
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| 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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ziko
Site Admin
Joined: 01 Dec 2006
Posts: 667
Location: St Neots
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| Posted: Tue Feb 27, 2007 1:36 pm Post subject: |
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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 |
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PaulF
Active User
Joined: 12 Apr 2006
Posts: 9
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| Posted: Tue Feb 27, 2007 4:13 pm Post subject: Picolog frequency measurement problem |
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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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Sarah
Guest
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| Posted: Thu Mar 01, 2007 9:46 am Post subject: |
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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 |
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