How to determine alternating current frequency?

DWQA QuestionsCategory: Basic of Electrical EngineeringHow to determine alternating current frequency?
How Engineering Works Staff asked 6 years ago
1 Answers
How Engineering Works Staff answered 6 years ago

Answer: Zero crossings of the sine wave to trigger a monostable (pulse generator) is a way to determine alternating current frequency. A fixed width pulse is generated for each cycle. Thus there are “n” pulses per second, each with with a constant energy. The more pulses there are per second, the more the energy. The pulses are integrated (filtered or averaged) to get a steady DC voltage which is proportional to frequency. This voltage can then be displayed on an analogue or digital voltmeter, indicating frequency. This method is more suitable than a direct counter, as it can get good accuracy in a second or so.

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