TM-9-2330-356-14

SEMITRAILER, TANK: 5000 GALLON, BULK HAUL, SELF LOAD/UNLOAD M967 AND M967A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, AUTOMOTIVE M969 AND M969A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, UNDER/OVERWING AIRCRAFT M970 AND M970A1

TECHNICAL MANUAL; OPERATOR’S, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1990

TM-9-2330-356-14 - Page 168 of 528

TM 9-2330-356-14

NOTE:

IF NEEDLE WI LL NOT’’ZERO” REPLACE THE BATTERIES.

IF THE NEEDLE STILL WILL NOT “ZERO” AFTER REPLAC-

ING THE BATTERIES, TURN THE METER IN FOR REPAIR.

TA099763

Figure 4-7. Zeroing the Simpson 160.

TA099764

Figure 4-8. Using the Meter to Test Continuity.

c.

Testing for Shorts.

A short (or short circuit) occurs

when two circuits that should not be connected have

metal-to-metal contact with each other. A short also

occurs when a circuit that should not touch ground has

metal-to-metal contact with ground. To check for shorts,

do as follows:

(1) Zero the multimeter (para 4-10).

CAUTION

Failure to disconnect the battery ground

cable (or outside power source) can damage

the meter.

(2) Disconnect the battery ground cable at

battery. Then disconnect the circuit being tested.

(3) Connect one probe to one circuit and

the

the

other probe to either the other circuit or to ground

(fig. 4-9). The figure shows how to test for a short between

two wires.

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