19 - 5
Electrical Testing Methods
- Using a Multimeter
4 Testing a Diode or a Diode Wire
A diode wire is a diode with male connector fitted on one end and a female connector fitted on the other end. The diode is
sealed in heatshrink sleeving.
a On the FLUKE 85
Turn the switch to position D.
Press the HOLD button and check that the H sign appears at the top right hand side of the display window.
Connect the black probe to the end of the diode with a band or to the male connector of the diode wire. Connect
the red probe to the other end of the diode or diode wire. If the beeper does not sound the diode or diode wire is
faulty.
Connect the red probe to the end of the diode marked with a band, or to the male connector of the diode wire, the
black probe should be connected to the other end of the diode or diode wire. If the beeper sounds or the meter does
not read O.L., the diode or diode wire is faulty.
Press the HOLD button and check that the H sign disappears from the right hand side of the display window.
b On the AV0 2003
Move the right hand slider to position A, and the left hand slider switch to position C.
Connect the black probe to the end of the diode marked with a band, or to the male connector of the diode wire, the
red probe should be connected to the other end of the diode or diode wire. If the Avometer does not buzz the diode
is faulty.
Connect the red probe to the end of the diode marked with a band, or to the male connector of the diode wire, the
black probe should be connected to the other end of the diode or diode wire. If the Avometer does not read "1" the
diode is faulty.
c On an analogue meter
Select the Ohms 1000s (1k) range.
Connect the black probe to the end of the diode marked with a band, or to the male connector of the diode wire, the
red probe should be connected to the other end of the diode or diode wire. The meter should read 20-400 KΩ, if it
reads more than this the diode is faulty.
Select the Ohms 100s range.
Connect the red probe to the end of the diode marked with a band, or to the male connector of the diode wire, the
black probe should be connected to the other end of the diode or diode wire. The meter should read 300-400Ω, if it
reads less than this the diode is faulty.
Section C Electrics
9803/3280
Section C
19 - 5
Issue 1
Service Procedures
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