2. Plug the transistor to be tested into the measuring connector.
When doing so, pay attention to the following points:
- observe the pin configuration (i.e. C-B-E) of the transistor
(given in transistor comparison tables/lists).
- some types of transistor include base-emitter resistors, which
can distort the measurement result.
- the measured hFE value is not absolutely accurate. It only
confirms whether the transistor is working or not. The actual
amplification of a transistor depends on its working current.
This multimeter can deliver a base current up to 10 µA with a
Vce of
1,5
V. The collector current flowing during measurement
is captured and from this the hFE value is calculated.
- no transistor can be measured which is incorporated into a circuit.
- the hFE values of FETs or other unipolar transistors cannot be
measured with this multimeter.
- when the connecting "legs" of the item to be measured do
not fit into the socket (too "thick"), do not use force, other-
wise the socket can thereby be damaged.
- the measurement of hFE reacts to temperature variations. As
soon as the transistor is picked up and plugged into the
connector and thereby warmed with the fingers, the measu-
red value can alter. If an unstable display occurs, remove the
transistor and allow it to cool down to room temperature.
Disposal
Dispose of an unusable, irreparable digital multimeter in accordan-
ce with applicable statutory regulations!
Rectification of faults
With the Digital Multimeter VC
-160
you have acquired a new-gene-
ration measuring instrument built to the latest technological stan-
dards. However, faults can occur. Because of this, the following
describes how some of these problems can be resolved by the
user relatively easily:
42
and (C) collector as indicated into the connector sockets. Take the
pin configuration for the various transistors from a transistor refe-
rence book.
f) Measuring function switch = rotary switch
The rotary switch must on no account be moved
while connected with the circuit being measured,
as this can damage the measuring instrument and
as a result the life of the user may be endangered in
the case of voltages greater than 25 V AC rms or 35
V DC
Clockwise, the following measurements are possible:
A =
= DC current (5 ranges, 400 µA to 10A)
hFE = Transistor hFE parameter testing
V =
= DC voltage with automatic range-switching
V ~
= AC voltage with automatic range-switching
–
I–
= Diode test
OHM
= Resistance measurement with automatic range-
switching
= symbol for acoustic continuity test
A ~
= AC current (5 ranges, 400 µA to 10A)
g) Display details and operating mode symbols
- Diode
test
The value which is displayed during the diode test is the voltage
conducted at the approx. 1 mA test current. The measuring
range here is 0 to approx.
1
.
5
V.
35
