To test a diode out of a circuit, connect the
Meter as follows :
1) Insert the red test lead into the V
W
terminal
and the black test lead into the COM terminal.
2) Set the rotary switch to position
.
3) Use SELECT button to select Diode range
4) For forward voltage drop reading on any
Semiconductor component, place the red test
lead on the component’s anode and place the
black test lead on the component’s cathode.
The measured value is shown on the display.
Caution :
n
In a circuit, a good diode will produce a
forward voltage drop reading of 0.5V to 0.8V;
However ; the reverse voltage drop reading can
Vary depending on the resistance of other
pathways between the probe tips.
n
Connect the test leads to the proper terminals as
said above, to avoid error display. The LCD will
display “1” indicating open-circuit for wrong
connection. The unit of diode is Volt (V),
displaying the positive connection voltage-drop
value.
(Figure 11)
Red
Black
V
W
CAP
NPN
PNP °C
m
A
mA
10A
CE
OFF
OFF
Hz
SELECT
RANGE
HOLD
Hz/DUTY
hFE
FUSED
10A/15SEC.
MAX
400mA
1000V MAX
V mA
W
COM
10A
207 MK-1(T)
399.9
E
E B C
~
~
~
~
!
!
24
The frequency measurement range is 9.99 MHz.
To measure frequency, connect the Meter as
follows :
1)
Insert the red test lead into the
V
W
terminal and
the black test lead into the
COM
Terminal.
2)
Set the rotary switch in the Hz range.
3)
Connect the test leads across with the object
being measured.
The measured value is shown on the display.
Caution :
n
When Hz measurement has been completed,
disconnect the connection between the testing
leads and the circuit under test.
I. MEASURING DIODES & CONTINUITY
(See figure 11)
Warning
To avoid damage to the Meter or to the equipment
under test, disconnect circuit power and discharge all
high-voltage capacitors before measuring diodes and
continuity.
Testing Diodes
Use the diode test function to check diodes, The
diode test sends a current through the
Semiconductor junction, and then measures the
voltage drop across the junction. A good silicon
junction drops between 0.5V and 0.8V.
!
23
