UNI-T UT202A Spécifications télécharger pdf (Page 19)

Measurement Operation(5)

D.Testing Diodes (see figure 6)

red black

( figure 6)

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 VΩ terminal and

the black test lead into the COM terminal.

2. Set the rotary switch toΩ and press SELECT

button to select 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.

Model UT201/202: OPERATING MANUAL

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UNI-T UT202A Spécifications Page 19