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CPU314C frequency measurement

Created by: Dragonarsty at: 10/17/2008 10:36 AM (2 Replies)

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10/17/2008 10:36 AM	Rate (0)
Dragonarsty Advanced Member Joined: 5/6/2008 Last visit: 2/11/2025 Posts: 57 Rating: (2)	Dear All: I'mtesting the CPU314C frequency measurement function! In the STEP 7 HW Config,there is a parameters i can't understand! It has been marked in th attachment! When thefact pulse'sfrequency =2.5kHz,and the marked parameterbe set 1kHz,the current frequency value is 0. Attachment Image00000.JPG (319 Downloads)

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10/17/2008 12:33 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 2/13/2025 Posts: 12336 Rating: (2703)	Hello Dragonasty; I have prepared the following extract (from the CP31xC Technological Functions manual) to show the relationship of the parameters you are trying to control in your frequency counting application. I suggest you raise the max. counting frequency from 1kh to at least twice the maximum frequency of the signal you are trying to measure; 5khz would be borderline, 10 kHz would be more precise. Hope this helps, Daniel Chartier Attachment MaxPulse Count.JPG (324 Downloads)

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10/21/2008 5:27 AM	Rate (0)
Dragonarsty Advanced Member Joined: 5/6/2008 Last visit: 2/11/2025 Posts: 57 Rating: (2)	Thank you dchartier. I thank it is the internal counter's frequency,so it must big than the measured signal's.

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