Measuring voltage is usually the first step in testing a circuit. To test for voltage, the circuit being tested must be HOT, or receiving power. Polarity must also be observed.
The negative lead of the multimeter is attached to the negative side of the circuit; the positive lead of the meter is connected to the positive side of the circuit.
Use the following procedure (figure 6-3) to test for voltage:
1. Select Volts DC or 300 mV from the selector.
2. Plug the black test probe into the “Com” input jack of the meter. Plug the red test probe into the “V” input jack.
3. Touch the probe tips to the circuit across a load or power source, as shown, in parallel to the circuit.
4. View the reading. Be sure to note the unit of measurement.
