3.2.3
Diode Test
A
To avoid electrical shock andor damage to the
instrument, disconnect circuit power and
discharge all high-voltage capacitors before
testing diodes.
Use the diode test to check diodes, transistors, and other
semiconductor devices. The diode test sends a current
through the semiconductor junction, then measures the
voltage drop across the junction,
A
good silicon junction
drops between
0.5V and 0.8V.
To test a diode out of a circuit:
1.
Set the rotary switch to
4
range.
2.
Press the
04l-bk
key to activate Diode Test.
3.
Connect the black and red test leads to the COM and
VR terminals respectively.
4.
For forward-bias readings 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.
5. The meter will show the approx. forward voltage of the
diode.
In a circuit, a good diode should still produce a forward bias
reading
of
0.5V to 0.8V; however, the reverse-bias reading
can vary depending on the resistance of other pathways
between the probe tips.
3.2.4
Continuity Check
A
To avoid electrical shock andor damage to the
instrument, disconnect circuit power and
discharge all high-voltage capacitors before
testing for Continuity.
Continuity is a complete path for current flow.
The beeper sounds if a circuit is complete. These brief
contacts cause the Meter to emit a short beep.
To test for continuity:
1.
Set the rotary switch to
-bb
-0
range.
2.
Press the
*l)ll-bk
key to activate Continuity Check.
3.
Connect the black and red test leads to the COM and
Q
terminals respectively.
4.
Connect the test leads to the resistance in the circuit
being measured.
5. When the test lead to the circuit is below
50R, a
continuous beeping will indicate it.
Note:
*
Continuity test is available to check openlshort of the
circuit.
3.2.5
Capacitance measurement
A
To avoid electrical shock andor damage to the
instrument, disconnect circuit power and
I
discharge all high-voltage capacitors before
measuring capacitance. Use the dc voltage
1
function to confirm that the capacitor is
(
I
discharged.
Capacitance is the ability of a component to store an
electrical charge.
17
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