TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 848 of 890
TM 9-2320-280-20-1 DC CURRENT 0 TO 1500 AMPS TEST #90 Description: Pre-Test Procedures This procedure measures DC currant in the range of Run Confidence Test. 0 to 1500 amps. The VTM is used as an ammeter with the decimal point in the right positiion. This test may be done with the vehicle/equipment operating. Test requires the use of the TK adapters and transducers. Typical Applications: Test Procedure: 1. Connect test probe cable W4. 2. Attach P1 to J2 or J3. Connect the Current Probe to P2. 3. Set TEST SELECT switch to 90. 4. Clamp probe to da-energized wire. 5. Press and hold TEST button until CAL appears on display. 6. Release TEST button and wait for offset value to appear on display. If offset is within 225 to -225 proceed. If not, go to DCA Troubleshooting Procedure. 7. Energize circuit. Press and release TEST button. 8. Observe displayed value. A negative reading indicates the probe is backwards. Reverse and repeat from step 4. Control Functions: 01,02,03,04,06 Possible Error Messages E002 Offset not performed. E005 Transducer not connected. 2-751