UNI-T UT90A Specifications download pdf (Page 13)

Model UT90A: OPERATING MANUAL

To test a diode out of a circuit, connect the Meter

as follows:

1. Insert the red test lead (anode “+”) into the

VO terminal and the black test lead

(cathode “-”) into the COM terminal.

2. Set the rotary switch to , place the red

test lead on the component’s anode and

place the black test lead on the

component’s cathode.

3. For forward voltage drop readings on any

semiconductor component, the measured

value shows on the display and the unit of

diodes measurement is mV.

Note

l In a circuit, a good diode should still

produce a forward voltage drop reading of

500mV to 800mV.

l Connect the test leads to the proper

terminals as mentioned above to avoid

error display. The LCD will display “1”

indicating open-circuit or polarity for wrong

connection.

l Open-circuit voltage of diodes

measurement is about 3V.

l To measure online capacity, please turn off

power of the circuit and discharge all

capacitors.

l When diode testing has been completed,

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UNI-T UT90A Specifications Page 13