___________________________________________________________________________ Transistors
measuring these resistances with an ohmmeter as shown in the figure, you can determine if
the transistor is leaking current through its junctions. When making these measurements,
avoid using the R x 1 scale on the meter or a meter with a high internal battery voltage.
Either of these conditions can damage a low-power transistor. Now consider the possible
transistor problems (see Table 2-2) that could exist if the indicated readings in Figure 2-22
are not obtained. Figure 2-22 shows a PNP transistor. If you need to test an NPN transistor
for leakage, the procedure is identical to that used for testing the PNP except the readings
obtained are reversed.
Figure 2-22. Testing a Transistor's Leakage with an Ohmmeter
23 June 2005
TC 9-62
2-31
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