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.