Testing Diodes - Rev Ritter Em402 Bedienungsanleitung

Note
• For high-resistance measurement (>1MΩ), it is
normal taking several seconds to obtain a stable
reading.
• If Ω reading with shorted test leads is not ≤ 0.5Ω,
check for loose test leads, wrong function selected, or
enabled data holding function.
• The LCD displays OL indicating open-circuit or the
tested resistor is higher than the maximum range of
the meter.
• Resistance measurement is default to auto range
mode.
• To remove the objects being tested from the circuit
when measuring can obtain a more accurate result.
• When resistance measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test and remove testing leads
from the input terminals.
D. Testing Diodes
red | black
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Warning
To avoid damages to the Meter or to the devices under
test, disconnect circuit power and discharge all the
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 semicondutor junction, then measure the
voltage drop across the junction. A good silicon junction
drops between 0.5V and 0.8V.
To test the diode out of a circuit, connect the Meter as
follows:
1. Insert the red test lead into the terminal
and the black test lead into the COM terminal.
2. Set the rotary switch to Ω
button to select measurement mode.
3. For forward voltage drop readings on any semicon-
ductor component, place the red test lead on the
component's anode and place the black test lead
on the component's cathode.
Note
• In a circuit, a good diode should still produce a
forward voltage drop reading of 0.5V to 0.8; however,
the reverse voltage drop reading can vary depending
on the resistance of other pathways between the
probe tips.
• Connect the test leads to the proper terminals as
said above to avoid error display.
• The LCD will display OL indicating either open circuit
or wrong polarity connection.
• The unit of diode is volt (V), displaying the forward
voltage drop readings.
• To remove the objects being tested from the circuit
when measuring can obtain a more accurate result.
• When diode testing has been completed, disconnect
the connection between the testing leads and the
circuit under test and remove testing leads from the
input terminals.
V Ω
and press SELECT,
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