Velleman DCA75 - Manual (Page 14)

Atlas DCA Pro User Guide December 2012 – Rev 1
Page 14
PNP Silicon BJT
Red-E Green-B Blue-C
HFE=106
HFE=106
at IC=5.00mA
VBE=0.754V
VBE=0.754V
at IB=5.00mA
ICLeak=0.000mA
Bipolar Junction Transistors (BJTs)
Bipolar Junction Transistors are simply “conventional”
transistors, although variants of these do exist such as
Darlingtons, devices with free-wheeling diodes, resistor
shunted types and combinations of these types. All of these
variations are automatically identified by the DCA Pro and their schematic
symbol display on the screen. Both NPN and PNP types are supported.
The 3 test clips can be applied to the transistor in any configuration.
As an example, testing a common PNP transistor such as the 2N5401 will
result in a display similar to this:
This example shows that the Red test
clip is connected to the Emitter, the
Green is connected to the Base and
the Blue test clip is connected to the
Collector.
Pressing scroll-off allows further
details to be displayed.
The DC current gain (H
FE
), base emitter
voltage drop (V
BE
) and collector leakage current (I
C
Leak) are all shown along
with their test conditions.
Refer to the following sections for more details on these measurements.