TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
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TM 9-2320-280-20-1 RESISTANCE AND CONTINUITY O TO 4500 OHMS TEST #91 Description: This procedure measures resistance in the range of 0 to 4500 ohms. The VTM is used as an ohm- meter, and test results are always displayed with the decimal point in the right position. Additionally, any voltage present in the device being tested will adversely affect test results. Make sure the circuit or component being tested is shut off. Test re- quires the use of the TK adapters and transducers. Typical Applications: ● Continuity checks ● Resistance measurements ● Switch and relay functions Test Procedure: 1. Connect test probe cable W2. Attach P1 to J4. 2. Connect the desired test leads to P2. 3. Set TEST SELECT switch to 91. 4. Short leads together. Press and hold TEST button until CAL appears on display. 5. Release TEST button and wait for offset value to appear on display. 6. If offset is within -225 to 225 proceed. If no go to DCA Troubleshooting Procedure 7. Press and release TEST button. Observe displayed value. Pre-Test Procedures Run Confidence Test. Control Functions: 01,02,03,04,06 Possible Error Messages E005 Offset not Performed. E022 External voltage detected while measuring resistance. 2-752