13
! Diode and Continuity Tests
Each press of toggles the diode and continuity functions. Both
functions cannot be selected for the secondary display.
The diode test measures the forward voltage of a semiconductor junction at
approximately 0.5mA. The beeper generates a single beep tone when the
input voltage drops below +0.7V (approximately 1.4kΩ) and generates a
continuous beep tone when the input voltage drops below +50mV
(approximately 100Ω).
Readings are displayed in the 1.2V range at the slow measurement rate, and
4V range at the medium and fast measurement rates. “OL” is displayed for
voltage above 1.2V at the slow measurement rate and 2.5V at the medium
and fast measurement rates. If the diode/continuity test is performed at the
slow reading rate, readings are displayed in 10µV resolution on the
1.19999V (1.2V) range.
The continuity test measures the resistance of a tested circuit with 2-wire
method at approximately 0.5mA and determines whether a circuit is intact.
The beeper generates a continuous beep tone when the input resistance value
is less than approximately 10Ω.
For continuity test, the measurement range will be fixed at 120
Ω
range if the
slow reading rate is selected. The measurement range will be fixed at 400
Ω
range if the medium or fast reading rate is selected.
Press
to select diode test function, then connect the test leads across
the diode under test as shown in Figure 2-7 (Reversing the polarity will
reverse-bias the diode).
Press
again to select continuity test function, then connect the test
leads or across the tested circuit as shown in Figure 2-8.
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