Multimeters (VOM/DMM) Basics

Analog (VOM) and digital (DMM) multimeters are used to measure voltage (volts), resistance (ohms), and current (amperes). Some can be used to make other measurements such as temperature or high current; these usually involve the use of one or more special probes or accessories that are readily available.

Figure 3-23 shows an analog multimeter.
The multimeter is used mainly to measure:
• High-level A C voltages in power and load circuits.
• Low-level A C and D C voltages and DC currents in control and electronic module circuits.
• Resistance and continuity on system and component wiring, including motor windings, relay coils, and motor starter/contactor coils.
• Run and start capacitors for a shorted or open condition.

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