Velleman DCA55 - Manual (Page 16)

Atlas DCA User Guide October 2007 – Rev 7
Page 16
Base-Emitter Voltage Drop
The DC characteristics of the base-emitter
junction are displayed, both the base-emitter
forward voltage drop and the base current
used for the measurement.
The forward base-emitter voltage drop
can aid in the identification of silicon or
germanium devices. Germanium devices
can have base-emitter voltages as low as
0.2V, Silicon types exhibit readings of
about 0.7V and Darlington transistors
can exhibit readings of about 1.2V because of the multiple base-emitter
junctions being measured.
Note that the Atlas DCA does not perform the base-emitter tests at the
same base current as that used for the current gain measurement.
B-E Voltage
Vbe=0.77V
Test current
Ib=4.52mA
IB
VBE