23
Note
l In a circuit, a good diode should still produce a forward
voltage drop reading of 0.5V to 0.8V; however, the
reverse voltage drop reading can vary depending
on the resistance of other pathways between the
probe tips.
l Connect the test leads to the proper terminals as
said above to avoid error display.
l The open-circuit voltage is around 3V when testing
diode.
l The LCD will display 1 indicating open-circuit for
wrong connection.
l The unit of diode is Volt (V), displaying the positive-
connection voltage-drop value.
l When diode testing has been completed, disconnect
the connection between the testing leads and the
circuit under test.
Measurement Operation(10)
Testing Continuity (see figure 7)
( figure 7)
red black
Model UT90A: OPERATING MANUAL
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