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TM 9-254
8-2.
Meter Usage - Continued
Table 8-5. High Power P-N-P Transistor Characteristics
Meter connections
Test step
Emitter
Base
Collector
Ohmmeter reading
1
none
-
+
50 ohms
2
+
-
none
50 ohms
3
none
+
-
30K ohms or greater
4
-
+
none
50K ohms or greater
Table 8-6. High Power N-P-N Transistor Characteristics
Meter connections
Test step
Emitter
Base
Collector
Ohmmeter reading
1
none
+
-
50 ohms
2
-
+
none
50 ohms
3
none
+
30K ohms or greater
4
+
-
none
50K ohms or greater
8-3.
Multimeter Familiarization.
a.
Front Panel (fig. 8-5). The instrument has a large easy to read, 4 1/2 inch meter scale at the top of the front
panel. Below the meter are three operating controls and eight jacks.
b.
Range Switch (fig. 8-5). The range switch, in the center of the lower part of the front panel, has 12 positions.
It may be turned in either direction to obtain any desired range and circuit position. There are six voltage ranges for DC
and six for AC, six ranges for direct current, and three resistance ranges.
c.
Function Switch (fig. 8-5). The function switch is located at the left hand side of the lower part of the front
panel. It has three positions: -DC, +DC, and AC. When direct current, DC voltage, or resistance is to be measured, the
function switch may be set at -DC or +DC depending on the polarity of current or voltage. Reversing the test lead
connections without removing them from the circuit is accomplished by the use of the function switch.
d.
Zero Ohms (fig. 8-5). The control at the lower right hand side on the front panel is marked ZERO OHMS.
This variable resistance in the ohmmeter circuit is used to compensate for the aging of the internal batteries.
8-8
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