Unit UT20B User manual

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Title
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
Rotary Switch
Display Symbols
Measurement Operation
A. AC Voltage Measurement
B. DC Current Measurement
C. Square Wave Output
D. Battery Test
E. Diodes Test
F. Measuring Resistance
G. DC Voltage Measurement
Table of Contents (1)
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Model UT20B: OPERATING MANUAL

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Table of Contents (2)
Title
General Specifications
Accuracy Specifications
A. AC Voltage
B. DC Current
C. Square Wave Output
D. Battery Test
E. Diodes Test
F. Resistance Test
G. DC Voltage
Maintenance
A. General Service
B. Replacing the Battery
C. Replacing the Fuses
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Model UT20B: OPERATING MANUAL

This Operation Manual covers information on safety and cautions. Please read the
relevant information carefully and observe all the Warnings and Notes strictly.
Warning
To avoid electric shock or personal injury, read the "Safety Information" and
"Rules for Safe Operation" carefully before using the Meter.
Digital Multimeter Model UT20B (hereafter referred to as "the Meter") is a pocket-
size hand-held digital multimeter with advanced design, multiple functions, and
reliable performance. Because of its small size, it is very convenience for user to
work with it. It is very easy to operate, so it is suitable to the beginner of multimeter.
Besides the basic functions, the Meter also has some extraordinary functions such
as battery test and square wave output.
Overview
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Model UT20B: OPERATING MANUAL

Open the packing case and take out the Meter. Check the following items carefully
to see any missing or damaged part:
In the event you find any missing or damage, please contact your dealer immediately.
Item
1
2
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Description
Operating Manual
Test Lead (affixed onto the Meter)
12V Battery (A23) (installed)
Qty
1 piece
1 pair
1 piece
Unpacking Inspection
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Model UT20B: OPERATING MANUAL

This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage
category (CAT. II 300V) and double insulation.
CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient
voltage overvoltages than CAT. III.
Use the Meter only as specified in this operating manual, otherwise the protection
provided by the Meter may be impaired.
In this manual, a Warning identifies conditions and actions that pose hazards to
the user, or may damage the Meter or the equipment under test.
A Note identifies the information that user should pay attention on.
International electrical symbols used on the Meter and in this Operating Manual are
explained on page 9.
Safety Information
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Model UT20B: OPERATING MANUAL

Warning
To avoid possible electric shock or personal injury, and to avoid possible
damage to the Meter or to the equipment under test, adhere to the following
rules:
lBefore using the Meter inspect the case. Do not use the Meter if it is
damaged or the case (or part of the case) is removed. Look for cracks or
missing plastic. Pay attention to the insulation around the connectors.
lInspect the test leads for damaged insulation or exposed metal. Check
the test leads for continuity.
lDo not apply more than the rated voltage, as marked on the Meter, between
the terminals or between any terminal and grounding.
lThe rotary switch should be placed in the right position and no any
changeover of range shall be made during measurement is conducted to
prevent damage of the Meter.
Rules For Safe Operation (1)
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Model UT20B: OPERATING MANUAL

Rules For Safe Operation (2)
lWhen the Meter working at an effective voltage over 60V in DC or 30V rms
in AC, special care should be taken for there is danger of electric shock.
lUse the proper function and range for your measurements.
lDo not use or store the Meter in an environment of high temperature,
humidity, explosive, inflammable and strong magnetic field. The
performance of the Meter may deteriorate after dampened.
lWhen using the test leads, keep your fingers behind the finger guards.
lDisconnect circuit power and discharge all high-voltage capacitors before
testing resistance, diodes or current.
lBefore measuring current, check the Meter's fuses and turn off power to
the circuit before connecting the Meter to the circuit.
lReplace the battery as soon as the battery indicator appears. With a
low battery, the Meter might produce false readings that can lead to electric
shock and personal injury.
lTurn the Meter power off before opening the Meter case.
lWhen servicing the Meter, use only the same model number or identical
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Model UT20B: OPERATING MANUAL

Rules For Safe Operation (3)
electrical specifications replacement parts.
lThe internal circuit of the Meter shall not be altered at will to avoid damage
of the Meter and any accident.
lSoft cloth and mild detergent should be used to clean the surface of the
Meter when servicing. No abrasive and solvent should be used to prevent
the surface of the Meter from corrosion, damage and accident.
lThe Meter is suitable for indoor use.
lTurn the Meter off when it is not in use and take out the battery when not
using for a long time.
lConstantly check the battery as it may leak when it has been using for
some time, replace the battery as soon as leaking appears. A leaking
battery will damage the Meter.
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Model UT20B: OPERATING MANUAL

International Electrical Symbols
AC (Alternating Current)
DC (Direct Current)
Grounding.
Double Insulated.
Deficiency of Built-In Battery.
Diode.
Fuse.
Warning. Refer to the Operating Manual.
Conforms to Standards of European Union.
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Model UT20B: OPERATING MANUAL

Below table indicated for information about the rotary switch positions.
Rotary Switch
Rotary Switch Position
OFF
V
A
Ω
V
Function
Turn on or off the power.
AC voltage measurement range from 200V to 300V.
DC current measurement range from 2000µA to 200mA.
Square wave output.
Battery test (1.5V & 9V battery).
Diode test.
Resistance measurement range from 200Ωto 2000kΩ.
DC voltage measurement range from 200mV to 300V.
Display Symbols
Symbol Meaning
Indicates negative reading.
The input value is too large for the selected range.
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Model UT20B: OPERATING MANUAL