summary Of AC Measurements

summary

To measure AC current or voltage on a moving coil meter, the current or voltage must first be converted to DC.

● Iron-vane meter movement does not require conversion to DC.

● A clamp-on AC meter is based on the principle that current flowing through a wire generates a magnetic field.

● An oscilloscope provides the following information about a circuit:

● Frequency of the signal

● Duration of the signal

● Phase relationships between signal waveforms

● Shape of the signal’s waveform

Amplitude of the signal

● The basic parts of an analog oscilloscope are as follows:

● Cathode-ray tube

● Sweep generator

● Horizontal deflection amplifier

● Vertical deflection amplifier

● Power supply

● A counter measures frequency by comparing an unknown frequency to a known frequency.

● The basic parts of a frequency counter are listed here:

● Time base

● Input-signal conditioner

● Gate-control circuit

● Main gate

● Decade counter

● Display

● A Bode plotter produces a graph of a circuit frequency response against gain and phase shift.

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