6.7.2 BJT Transistor Test
NPN
The NPN Type consists of two N-Regions separated by a P-Region, so we can
suppose a diode between B - C and between B - E.
Now, we can test the NPN transistor as 2 diodes. To test the first diode (B - C), we
need to connect the red probe to the anode which is the base of the transistor and connect
the black probe to the cathode which is the collector of the transistor.