UNI-T UT33A Specifications download pdf (Page 24)

Measurement Operation (11)

Model UT33A: OPERATING MANUAL

To test a diode out of a circuit, connect the Meter as follows:

1. Insert the red test lead into the VΩmA terminal and the black test lead into the

COM terminal.

2. Set the rotary switch to Diode measurement is default or press SELECT

button to select diode measurement mode.

3. For forward voltage drop 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.

The measured value shows on the display.

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.

The LCD will display “OL” indicating open-circuit for wrong connection. The unit

of diode is Volt (V), displaying the positive-connection voltage-drop value.

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UNI-T UT33A Specifications Page 24