13
Diode Measurement
WARNING
Before measuring, switch off the power
supply of the circuit, and fully discharge
all capacitors.
This test sends a current through a diode or
a semiconductor junction, then measures the
voltage drop across the junction.
1.
Turn the rotary dial to the diode (
)
position. Press
SELECT
twice to choose
the diode test. [
Figure 5.1
]
2. Insert the
black test lead
into the
COM
terminal, and the
red test lead
into the
terminal.
3. Connect both test leads to both ends of the
PN junction. Hold the leads in place until
the reading on the display stabilizes.
Note:
• The display will show “
” if the test leads
are incorrectly connected, if the polarity is
reversed, or if the diode is open.
• The normal value for a PN silicon junction is
500–800mV (0.5–0.8V).
• The diode test voltage range is about
3.0V/1.5mA.
SELECT
Figure 5.1
Hz
A
mA
µA
mV
V
V
OFF
NCV
Ω
°F°C
Summary of Contents for MSR-A1000
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