MAINTENANCE OF THE M113 PER CARRIER - OD1601 LESSON 2/TASK 2
switch, be sure to check that the switch is in the ON position.
A switch in the
OFF position could give a false indication of an open circuit.
d Look at the meter needle. If the needle swings to the far right and
is over the zero on the top scale, the circuit has continuity. If the needle does
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.
(c) Reading DC Voltage.
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
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.