6-
19
Do the following:
1. Probe pin 1 with the red probe and pin 2 with the black probe.
2. Identify the signature.
Figure 6-26. Signature of Pins 1 And 2 of an Unknown Transistor
This looks like a collector-base signature. What you do not know yet is which pin is the collector
and which pin is the base.
3. Probe pin 3 with the red probe and pin 2 with the black probe.
4. Identify the signature.
Figure 6-27. Signature of Pins 2 and 3 of an Unknown Transistor
5. Now that you know that pin 2 of the unknown transistor is the collector, place the black probe
to the base on pin 1 and move the red probe to the emitter on pin 3. A base to emitter
signature will be displayed. This transistor is a NPN type since the base-emitter signature
matches a NPN transistor.
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