KYORITSU KEW 1109, Instruction Manual

Page: 25 / 36

̶ 23 ̶
Measuring Leakage Current of Transistor I
CEO
Fig. 5
⑺
The leakage current of
the silicon transistor is
too small to give pointer
deflection. If the pointer
s h o u l d d e f l e c t , t h e
likely cause would be
some fault of the silicon
transistor.
Fig. 6
⑻ With the germanium transistor the leakage current flows even if it is
good, but the amount slightly differs with the types of the transistor.
Use Table 4 below to determine if the germanium transistors are
good or bad.
Table 4
Leakage Current I
CEO
of
Germanium Transistors
Small &Medium
Sized Transistors
Large Sized
Transistors
Approx. 0.1 - 2mA Approx. 1 - 5mA
If the leakage current exceeds the above values
appreciably, the transistors are faulty.
(E)
EMITTER
(E)
EMITTER
(B)
BASE
(B)
BASE
(C)
COLLECTOR
(C)
COLLECTOR
P(+) P(+)
N(-COM)
N(-COM)
X10 X10
I
CEO
I
ECO
Ⓑ PNP Type Transistor Ⓐ NPN Type Transistor
N
(E)
(C)
(B)
NPN
TRANSISTOR
P
R
3V
＋
−
I
CEO
M