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TM-9-2350-247-20-1 Unit Maintenance Manual Volume 1 M548A1 M548A3 Tracked Cargo Carrier Download

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TM 9-2350-247-20-1 STE/ICE-R TEST 90 DC CURRENT 0 TO 1500 AMP 0126 00 THIS WORK PACKAGE COVERS: Test (page 0126 00-1) INITIAL SETUP: M a i n t e n a n c e L e v e l Unit T o o l s a n d S p e c i a l T o o l s STE/ICE-R Test Set (WP 0541 00, Item 6) P e r s o n n e l R e q u i r e d Unit Mechanic R e f e r e n c e s See your -10 TM 9-4910-571-12&P E q u i p m e n t C o n d i t i o n Engine stopped (see your -10) Carrier blocked (see your -10) STE/ICE-R power hooked up (WP 0114 00) STE/ICE-R starter circuit test hooked up (WP 0116 00) NOTE If current probe is below room temperature, wait at least 5 minutes after connecting probe to VTM before doing offset test, or perform offset within 30 seconds of starting each measurement. 1. Perform offset test. a. Set TEST select switches to 90. b. Push and hold TEST button until CAL appears. Release TEST button. c. If VTM reads between −225 and +225, offset test passes. d. If offset test fails, see TM 9-4910-571-12&P. 2. Press and release TEST button 3. Turn on circuit used to condition current probe. If starter is used to condition probe, energize starter long enough to obtain a reading. Do not allow engine to start. 4. Note polarity sign of conditioning current. If readout is negative (−), reverse current probe, and repeat Steps 1 page 0126 00-0 - 4 page 0126 00-0. 5. Turn off circuit used to condition current probe. 6. Perform offset test. NOTE Stray magnetic fields can affect the current reading. Such fields may exist within a foot or so of operating carrier generators and alternators, motor generators under load, and electric motors. Keep current probe at least one foot away from any operating generators, alternators, or electric motors. 7. During offset test, the component being tested must be off, and the circuit must be de-energized. a. Turn off component to be tested. b. Install current probe where current is to be measured. 0126 00-1