Transistor Tester; Defective Transistors; Transistor Beta Test Fixture - Fluke 8010A Instruction Manual

OPERATION
APPLICATIONS
2-55.
Transistor Tester
2-56.
The
transistor tester
described
in the following
paragraphs provides
approximate
test information. Beta
is
tested
usinga
VcEof2V and an
I
c of about 200
^uA.
This
transistor tester
is
useful for
checking
the proper
operation of
transistors
and approximate
beta values for
comparative measurements.
2-57.
The
transistor tester fixture
is
described
in
Figure
2-13.
When
assembled and coimected
to
the
V/kO/S
and
the
COMMON
input connector, the
Multimeter can be
used
to
determine the following
information
about
transistors:
•
Transistor type
(NPN
or
PNP)
•
Defective
transistors (shorted or open)
•
Collector-to-emitter leakage
(Ices)
•
Beta
from
10 to
1000
in a
single range.
2-58.
Transistor type
is
determined by
setting
the switch
on
the test fixture to
BETA,
setting
the Multimeter
to the
2
mS
range,
and
observing the display reading.
If
a low
reading (<
0.010)
is
displayed, reverse the
test
fixture at
the
input connectors.
If
the collector of the
transistor
is
now
connected
to
the
COMMON
input connector
the
transistor
is
a
PNP
type.
An
NPN
type
will
have
its
collector
connected
to the
V/kO/S
input connector.
2-59.
DEFECTIVE TRANSISTORS
2-60.
If
the
transistor
is
defective, the following
indications
will
appear,
regardless of
transistor
type or
test position:
1.
An
open
transistor will
produce a
display
reading of
0.001
or
less.
2.
A
shorted
transistor will
produce an
overrange
indication
on
the display.
SCHEMATIC
TRANSISTOR
UNDER
TEST
TEST FIXTURE
>
C
>
E
>-
BETA
R1
-^WV-
750kf2
A_
ICES
~l
>
PI
PLUG INTO
COMMON AND
V/Kn/S INPUT
TERMINALS
—
TRANSISTOR SOCKET CONNECTOR
0.75"
SPACING SWITCH
ARM
GENERAL
RADIO TYPE
274
MB
Figure
2-13. Transistor Beta Test
Fixture
2-12