Describe with block diagram the working of digital frequency meter.

Describe with block diagram the working of digital frequency meter.
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1 Answer

Answer :

Digital frequency meter:

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Amplifier:

The signal whose frequency is to be measured is first amplified and supplied to the schmitt trigger.


Schmitt Trigger:

The schmitt trigger convert the signal into square wave having fast rise and fall time.The square wave is then differentiated and clipped. Each pulse is proportional to each cycle of unknown signal


Start – Stop gate:

When the gate is open input pulses are allowed to pass through it.The counter is now start counting the pulses.

When gate is closed input pulses are not allowed to pass through it.The counter is now stop counting the pulses.


Counter and display:

The number of pulses during the period gate is open are counted by counter.If the interval between start and stop condition is known the freuency of unknown signal is measured.

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Where, F = unknown frequency

 N = No. count displayed on counter

 t = time interval between start and stop condition of the gate 


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