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Chapter 9: DMM (Digital Multimeter)
The EXP’s 8 digital meters make it versatile enough to test everything from a vehicle’s entire electrical
system to a board-level component:
• DC Voltmeter
• AC Voltmeter
• Scope
• DC Ammeter
• AC Ammeter
• Ohmmeter
• Diode Drop
• Volts/Amp
The DMM’s infrared temperature sensor also enables you to determine the surface temperature of
components before you service them or as a diagnostic aid. Specications for each tool are listed at
the end of this chapter in Table 5.
Select the DMM icon to display its METERS menu. The tools in this menu are available in a series of
three screens.
A measurement that is out of the limit displays as OL. Refer to the manufacturer specications for the
correct limits, which may vary by component or vehicle type.
DC Volts
The DC voltmeter measures voltage between two points in a circuit. The voltmeter is connected in
parallel with the circuit.
1. Connect the DMM test lead to the EXP’s accessories port.
2. Select the meter’s icon.
3. Connect the clamps or probes in the correct polarity: red clamp or probe to positive (+);
black to negative (–).
4. The meter will autorange and display the measurement.
5. To return to the METERS menu, press the END soft key.
Chapter 9: Digital Multimeter