Measuring under and over frequency

[siddarth.ghaste]

HI ALL,
How to measure under and over frequency..

 

[barry]

Could you be more specific? Under and over frequency of what? A pendulum? Solar eclipses? A sine wave? A complex wave?

 

[siddarth.ghaste]

of sine wave...

 

[jiripolivka]

At what frequency? Use a counter, a calibrated spectrum analyzer, a wavemeter....
What do you mean by "over" and "under"?

 

[siddarth.ghaste]

standard frequency is 50Hz, 46Hz is under frequency and 54Hz s over frequency.based on this I need to control some device.....

 

[barry]

Getting information out of you is very difficult.

Can't you use a frequency meter like jiri said? Or Spectrum analyzer?

WHAT ARE YOU TRYING TO DO???!!!! WHAT DO YOU WANT FROM US???

 

[jiripolivka]

standard frequency is 50Hz, 46Hz is under frequency and 54Hz s over frequency.based on this I need to control some device.....

For such case you can use a set of fork resonators like in the classical mains frequency indicator and use light sensors to activate the low or high output. Or, build a resettable counter from TTL circuits, with a digital comparator to get the desired outputs. You can build a simple frequency discriminator with a RC network,and a set of comparators. You can program an Arduino for the same operation.

Take one version and start doing something!