Continuity and Resistance Tests

M2/m3 Bradley Fighting Vehicle: Hull Power Distribution System
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(5) Continuity and Resistance Tests. The TS-352B/U multimeter can

be used to make continuity and resistance tests.

(a) Continuity Tests.

Continuity tests are used to test for

broken or loose wires, closed or short circuits and burned-out lamps.

First, set the RANGE switch to RX 1, unless there is a transistor in

the circuit.

If a transistor is in the circuit, use the RX100

setting. Plug the black lead into the -DC AC jack and the red lead

into the upper left OHMS jack (figure 38 on the following page). Now

set the FUNCTION switch to the OHMS position.

Now touch the black

lead to one end of the circuit and the red lead to the other end. If

the needle swings to the extreme right, the circuit could be either

closed but good or closed but shorted depending on the reason for the

test. When testing solid state circuits, if the needle doesn't move,

try switching the probes at the point of contact.

If the needle

still does not move, the circuit is open.

If the needle flickers,

this indicates a loose connection.

(b) Resistance Tests. Resistance tests are used to measure the

resistance of coils and resistors.

NOTE

Before beginning a resistance test, make sure no

battery voltage is connected to the circuit to be

tested.

Use the meter to see if any voltage is

present, or disconnect the battery ground cable.

This will prevent possible burnout of the meter.

To perform a resistance test, first, plug the black lead into the -DC

AC jack and the red lead into the upper left OHMS jack.

Set the

FUNCTION switch to the OHMS position.

If the approximate ohms rating of the circuit being tested is known,

set the RANGE switch to that RX value. If the rating is not known,

set the RANGE switch to RX10000.

When testing the resistance of

transistor circuits, use the RX100 range setting only.

This limits

the meter's power source to only