What is Duty Cycle?

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What is Duty Cycle?

Duty cycle is the ratio of On time to Off time, and is expressed as a percent. 100% Duty Cycle is always on. 50% Duty cycle is On half of the time and Off half of the time. The Frequency determines how often the On/Off cycle takes place.

If the Frequency is 1Hz ( which is 1 Cycle Per Second), then a 50% Duty Cycle signal would be on 1/2 second, off 1/2 second, and then repeat indefinitely.

Below is a 10Hz Squarewave that is pulsed 100% Duty Cycle, which means it is On all of time and never Off:

pic-10hz-pulsed100dc

Next is a 10Hz Squarewave pulsed at 1Hz at a 75% Duty Cycle:

pic-10hz-pulsed75dc

And, the same 10Hz Squarewave pulsed at 1Hz at a 50% Duty Cycle:

pic-10hz-pulsed50dc

And, the same 10Hz Squarewave pulsed at 1Hz at a 25% Duty Cycle:

pic-10hz-pulsed25dc

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