CDM-20 Page-13
3.4 TESTING DIODE
1.
Connect the black test lead to the COM jack and the red test lead to the V/
Ω
jack. (The polarity of
red lead is “+”.
2.
Set the rotary switch at the position and connect red lead to the anode, black lead to the
cathode of the diode under testing. The meter will show the approx. forward voltage of the diode. If
the lead connection is reversed, only figure “1” displayed.
3.5 TESTING TRANSISTOR
1.
Set the rotary switch at hFE position.
2.
Determine whether the transistor to be tested is NPN or PNP type and locate the Emitter, Base and
Collector leads. Insert leads of the transistor into proper holes of the transistor testing socket.
3.
The meter will show the approx. hFE value at test condition of base current 10µA and Vce 2.8V.
3.6 CONTINUITY TEST
1.
Connect the black test lead to the COM jack and the red test lead to the V/
Ω
jack. (The polarity of
the red lead is positive “+”
2.
Set the rotary switch at position and connect test leads across two points of the circuit under test.
If continuity exists (i.e. resistance less than about 30
Ω
), built-in buzzer will sound.
Summary of Contents for CDM20
Page 1: ...0607 DIGITAL MULTIMETER Model No CDM20 PartNo 4500007...
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