Reading DC Voltage.

Maintenance of The M113a1/a2 Personnel Carrier
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not move, the circuit is open (the continuity is broken). If the needle jumps or

flickers, the circuit has a loose connection.

If the needle moves to the right,

but not to zero, the circuit has resistance. Remember, continuity is a resistance

of less than one ohm.

In addition to performing continuity tests, it will

be necessary to make dc voltage readings while troubleshooting. Before dc voltage

can be measured, the multimeter must be properly set up.

1 Setting up the 160 for DC Voltage Reading.

To properly set up the

Simpson 160 multimeter for dc voltage measurement, the multimeter must first be

mechanically zeroed. Then, plug the black lead into the - COMMON jack and the red

lead into the + jack (figure 11 on page 34). Set the polarity reversing switch to

the + DIR position. Turn the selector switch to the proper volts dc (vdc) range

for the voltage being measured.

For example, to measure 24 volts dc, turn the

selector to vdc 50. To measure less than 10 volts, choose the vdc 10 position. If

the voltage to be measured is not known, the selector should be positioned on the

vdc 1000 setting for the first reading and then reduce, as necessary, to obtain an

accurate reading.

2 Setting up the TS-352 B/U for DC Voltage Readings. To set up the TS-

362 B/U multimeter for dc voltage measurement, first mechanically zero the meter.

Then, set the function switch to DIRECT. Plug the black lead into the DCAC OHMS

jack (figure 12 on page 35). The red lead should be plugged into the jack (on the

left side of the meter) that is suitable for the range of voltage being measured.

If the voltage to be measured is not known, plug the red lead into the 1000V jack

for the first reading; then, reduce the range by moving the red lead from jack to

jack. The second reading would be made from the 500V jack.