Voltage Testing

Using the DVOM

Voltage Testing

Voltage Testing:

The voltmeter (DVOM) must be connected in parallel with the load or circuit.

The DVOM has a high resistance and taps off a small amount of current.

A voltmeter must be used with the current on and with the correct polarity.

The red lead should be connected to the B+ side of the circuit and the black lead to the B- side of the circuit.

If the leads are reversed the reading will be a negative number.

Typical Application of Voltage Testing
- Checking Power Supply.
- Complete Basic Circuits
- Charging System.
- Control Module Functions (Input/Output).

- Select proper function and range of DVOM.
- Connect (-) lead of meter to battery B- or known good ground.
- Connect (+) lead of meter to test circuit.

DVOM will indicate supply or available voltage at that point.