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15th July 2006, 12:25 #1
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Measuring Frequency
I want to know the all method of measuring frequency?Who can help me?

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16th July 2006, 09:47 #2
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Re: Measuring Frequency
Hi
The one which i like is the zerocrossings method...
Just implement a zerocrossing comparator with a 1 second counter... and you have the frequency..

16th July 2006, 14:09 #3
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Re: Measuring Frequency
Originally Posted by xischaune
Alternatively circuits r there that convert frequency to voltage : use analog version for sin input and digital for square wave input

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16th July 2006, 15:25 #4
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Re: Measuring Frequency
What is frequency of a signal? It is number of periods in a second.
Count periods in a specific time and calculate frequency.
Period of a signal is inverselly proportional to it's frequency. Measure duration of a period and calculate frequency.
What previously posters said is dealing with signal conditioning before measurement and is not a method of frequency measurement.

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16th July 2006, 16:08 #5
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Re: Measuring Frequency
Originally Posted by Borber

16th July 2006, 17:21 #6
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Re: Measuring Frequency
CRO is one of possibillities. Sometimes you may use allso a seconds pointer on your watch. At some other indirect methods the use of a voltmeter or a meter or a scales is possible. But you always must count a number of periods or length of it.

16th July 2006, 20:17 #7
Measuring Frequency
You could consider a frequency to coltage converter and caliberate the voltgae to know the frequency.

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17th July 2006, 08:15 #8
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Re: Measuring Frequency
First bring down the voltage to 05 volts range using conventional voltage divider. Then feed this signal to a schmitt trigger based on an opamp. Then give this signal to CCP input of PIC 16f877 microcontroller. Search the michrochip website for an application note and u surely will find one.

17th July 2006, 08:45 #9
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Re: Measuring Frequency
Internet is full of frequency counter projects, mostly based on PIC MCU.
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