TM 5-2420-231-23-3
0370
MULTIMETER USAGE CONTINUED
Measuring Continuity
000370
CAUTION
Take care not to damage electrical terminals when probing with test equipment. Terminal
damage will occur when forcing a test probe into an electrical terminal.
Failure to follow this caution may induce additional symptoms and lead to an inaccurate
diagnosis.
Failure to follow these cautions may result in equipment failure.
1. Select the continuity/diode test on digital multimeter.
2. Connect digital multimeter leads to wiring harness terminals as directed in Troubleshooting.
3. Monitor and record reading. An audible sound is generated and digital multimeter displays a number repre-
senting the resistance of the component being tested.
Measuring Resistance
000370
CAUTION
Take care not to damage electrical terminals when probing with test equipment. Terminal
damage will occur when forcing a test probe into an electrical terminal.
Failure to follow this caution may induce additional symptoms and lead to an inaccurate
diagnosis.
Failure to follow these cautions may result in equipment failure.
1. Select Ohms on digital multimeter.
2. Connect digital multimeter leads to wiring harness terminals or component terminals as directed in Trouble-
shooting.
3. Monitor and record reading. Digital multimeter displays a number representing resistance of wire or component
being tested.
Measuring DC Voltage
000370
CAUTION
Take care not to damage electrical terminals when probing with test equipment. Terminal
damage will occur when forcing a test probe into an electrical terminal.
Failure to follow this caution may induce additional symptoms and lead to an inaccurate
diagnosis.
Failure to follow these cautions may result in equipment failure.
1. Select VOLTS DC on digital multimeter.
2. Select highest voltage range or a range that is higher than voltage to be measured.
3. Connect red probe to circuit being tested, and connect black probe to low reference circuit, ground circuit, or
machine ground as directed in Troubleshooting. If a negative voltage is measured, reverse multimeter probes
at test points.
4. Monitor and record reading. Digital multimeter displays a number representing DC voltage.
0370-18
