summary Of Electrical Measurements—Meters

summary

● Analog meters use a graduated scale with a pointer.

● Digital meters provide a direct readout.

● On both analog and digital meters, the red terminal is positive and the black terminal is negative.

● Before using an analog meter, check the mechanical zero adjustment.

● A multimeter combines a voltmeter, ammeter, and ohmmeter into one package.

● A VOM is an analog multimeter that measures volts, ohms, and milliamperes.

● A DMM is a digital multimeter.

● On a multimeter, the range selector switch selects the function to be used.

● An ammeter must be connected in series with a circuit.

● A voltmeter is connected in parallel with a circuit.

● An ohmmeter measures resistance by the amount of current flowing through the resistor being measured.

● The maximum value of a meter scale is called the full-scale value.

● The number of divisions on the meter scale depends on the range the meter is designed to measure.

● Ammeters and voltmeters are read from left to right and have a linear scale.

● Ohmmeters are read from right to left and have nonlinear scales.

● An analog ohmmeter must be calibrated before use to compensate for battery deterioration.

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