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.