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the resistance. This value represents the resistance of the test
leads and should be subtracted.
z
On 20 MΩ and 200 MΩ ranges, the meter may take a few
seconds to stabilize the reading. This is normal for high
resistance measuring.
z
When the input is not connected, i.e. at open circuit, the figure
“1” will be displayed indicating an overrange condition.
4. Diode Measurements
Use the diode test to check diodes and other semiconductor
devices. The diode test sends a current through the semiconductor
junction, and then measures the voltage drop across the junction. A
good silicon junction drops between 0.5 V and 0.8 V.
CAUTION
Always connect the test leads to the instrument inputs first before
connecting the DUT to avoid potential shock hazard.
Follow these steps to make conduct a diode test:
1. Set the rotary switch to the diode range, .
2. Connect the black test lead to the COM input.
3. Connect the red test lead to the VΩHz input.
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 approximate forward voltage of
the diode. If the test lead connection is reversed, only the
figure “1” will be displayed.
6. In a circuit, a good diode should still produce a forward
bias reading of 0.5 V to 0.8 V; however, the reverse-bias
reading can vary depending on the resistance of other
pathways between the probe tips.
Summary of Contents for PRO-50A
Page 1: ...Handheld Digital Multimeter PRO 50A ...
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