UNI-T UT81B User Manual

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Model UT81B: OPERATING MANUAL
Ω
Note1. Insert the red test lead into the Ω terminal and the
black test lead into the COM terminal.
2. Set the rotary switch to .
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 red test lead
polarity is “+” while the black test lead polarity is “—
“.
The measured value shows on the display.
When measuring diode, the corresponding functional
buttons:
DIODE REL
F1 F2
F1: toggle to continuity buzzer
F2: relative mode
Connect the test leads to the proper terminals as
said above to avoid error display.
The LCD will display OL indicating either open
circuit or wrong polarity connection.
The unit of diode is volt (V), displaying the positive-
connection voltage-drop value.
When diode testing has been completed, disconnect
the connection between the testing leads and the
circuit under test and remove the test leads away
from the input terminals.
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UNI-T UT81B Specifications

General

Backlight	Yes
Product type	Digital multimeter
Frequency range	0.01 - 10000 kHz
AC current range	0.4 - 10 A
AC voltage range	4 - 750 V
DC voltage range	0.4 - 1000 V
Dimensions (WxDxH)	100 x 48 x 200 mm
Battery voltage	1.5 V

Weight and Dimensions

Weight	498 g