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5.5 Current
GB
transistors
1) Plug the transistor according to its ter-
minals (E, B, C) into the connector (6).
Use the right socket half for NPN
types and the left socket half for PNP
types.
2) Turn the rotary switch (3) into position
"hFE".
3) The display shows the current amplifi-
cation (max. 1000) at a basic current
) of approx. 10 µA and a voltage of
(I
B
collector and emitter (U
2.8 V.
5.6 Forward voltage with diodes
1) Connect the red test lead to jack "V/Ω"
(8).
2) Set the rotary switch (3) to position
.
3) Hold the cathode of the diode to the
black measuring tip and the anode to
the red measuring tip.
4) The display shows the forward voltage
at a test current of approx. 1 mA in mV.
With a display of 0 V the diode has a
short circuit.
With the display "1" the diode is inter-
rupted or connected in reverse direc-
tion (change the polarity of the diode).
10
amplification
) of approx.
CE
with
6 Replacing of Battery or
Fuse
Prior to opening the unit in any case
remove the test leads from the measur-
ing points of the circuit to avoid any
danger of an electric stroke.
Never use the unit if it has been
opened.
a. If the symbol
battery must be replaced.
b. If no current measuring is possible
except in the 20 A range, check the
fuse and replace it by one of the same
type, if necessary. The following fuse
has been inserted:
DMT-2505: 0.2 A, quick-acting
DMT-2560: 2 A, quick-acting
Open the unit:
DMT-2505: Remove both screws at the
rear side of the unit, and take off the
lower housing shell.
DMT-2560: For the battery replacement
only remove the lower screw, and take off
the cover of the battery compartment. To
replace the fuse, additionally remove the
four screws of the lower housing shell.
Two screws are in the battery compart-
ment.
After the replacement screw the housing
shell, with model DMT-2560 additionally
screw the cover of the battery compart-
ment. Only then use the instrument
again.
is displayed, the 9 V
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