Introduction to instruments


Square wave and pulse generator



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Square wave and pulse generator:


The square wave generator and pulse generator are generally used as measuring devices in combination with the oscilloscope. The basic difference between square wave generator and pulse generator is in the duty cycle. The duty cycle is defined as the ratio of average value of a pulse over one cycle to the peak value. It is also defined as ratio of the

pulse width to the period of one cycle.



The average value is half of peak value. Both the average value and peak value are inversely proportional to time duration. The average value of a pulse is given as,



1

Average value = 1/2 Peak value Duty cycle of square wave = 0.5



Thus square wave generator produces an output voltage with equal ON and OFF periods as duty cycle is 0.5 or 50% as the frequency of oscillation is varied. Then we can state that irrespective of the frequency of operation, the positive and negative half cycles extend over half of the total period


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