Peak Atlas DCA Pro
User Guide
June 2019
–
Rev 1.7
Page 14
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 is
displayed 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
), collector saturation
voltage (V
CE
sat) and collector leakage current (I
C
Leak) are all shown along
with their test conditions.
Refer to the following sections for more details on some of these
measurements.
