Unit UT202A User manual

UT202A Operating Manual
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Title Page
Contents
Overview
Unpacking Inspection
Safety Information
Rules for Safe Operation
International Electrical Symbols
The Meter Structure
Functional Buttons and auto power off
Display Symbols
Measurement Operation
A. DC Voltage Measurement
B. AC Voltage Measurement
C. Measuring Resistance
D. Testing Diodes
E. Testing for Continuity
F. AC Current Measurement
Specications
A. General Specications
B. Environmental Restriction
Accuracy Specications
A. AC Voltage
B. DC Voltage
C. Resistance
D. Continuity Test
E. Diode Test
F. AC Current
Maintenance
A. General Service
B. Replacing the Battery

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UT202A Operating Manual
Overview
This Operating 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 UT202A (hereafter
referred to as “the Meter”) is 3 1/2 digits with
steady operations, fashionable structure and
highly reliable measuring instrument. The Meter
uses large scale of integrated circuit with double
integrated A/D converter as its core and has full
range overload protection.
The Meter can measure AC/DC Voltage, AC
Current, Resistance, Diodes, and Continuity.
Unpacking Inspection
Open the package case and take out the Meter.
Check the following items carefully to see any
missing or damaged part:
Item Description Qty
1 English Operating Manual 1 piece
2 Test Lead 1 pair
In the event you find any missing or damage,
please contact your dealer immediately.

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Safety Information
This Meter complies with the standards
IEC61010: in pollution degree 2, overvoltage
category (CATII 600V, CAT III 300V) and double
insulation.
CATII: Local level, appliance, PORTABLE
EQUIPMENT etc., with smaller transient
overvoltages than CATIII.
CAT III: Distribution level, xed installation, with
smaller transient overvoltages than CAT IV
Use the Meter only as specied in this operating
manual, otherwise the protection provided by
the Meter may be impaired.
In this manual, a Warning identies 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 to.
International electrical symbols used on
the Meter and in this Operating Manual are
explained on page 6.
UT202A Operating Manual

Rules for Safe Operation
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:
● Before 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.
● Inspect the test leads for damaged
insulation or exposed metal. Check the test
leads for continuity. Replace damaged test
leads with identical model number or electrical
specications before using the Meter.
● Do not apply more than the rated voltage,
as marked on the Meter, between the terminals
or between any terminal and grounding. If the
value to be measured is unknown, use the
maximum measurement position and reduce the
range step by step until a satisfactory reading is
obtained.
● When measurement has been completed,
disconnect the connection between the test
leads and the circuit under test, remove the
testing leads away from the input terminals of
the Meter and turn the Meter power off.
● The 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.
● Do not carry out the measurement when
the Meter’s back case and battery compartment
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UT202A Operating Manual

65
are not closed to avoid electric shock.
● Do not input higher than 600V between the
Meter’s terminals and the grounding to avoid
electric shock and damages to the Meter.
● When 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.
● Use the proper terminals, function, and
range for your measurements.
● Do 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.
● When using the test leads, keep your
ngers behind the nger guards.
● Disconnect circuit power and discharge
all high-voltage capacitors before testing
resistance, continuity and diode.
● Replace 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.
● When servicing the Meter, use only the
same model number or identical electrical
specications replacement parts.
● The internal circuit of the Meter shall not be
altered at will to avoid damage of the Meter and
any accident.
● Soft 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.
● The Meter is suitable for indoor use.
● Turn the Meter off when it is not in use and
UT202A Operating Manual

take out the battery when not using for a long
time.
● Constantly 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.
International Electrical Symbols
AC (Alternating Current)
DC (Direct Current)
AC or DC
Grounding
Double Insulated
Warning. Refer to the Operating Manual
Deciency of Built-In Battery
Continuity Test
Diode
Conforms to Standards of European Union
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UT202A Operating Manual

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UT202A Operating Manual
The Meter Structure (see gure 1)
1. Input Terminals
2. LCD Display
3. Functional Buttons
4. Rotary Switch
5. Trigger: press the lever to open the
transformer jaws. When the pressure on the
lever is released, the jaws will close.
6. Hand Guards: to protect user’s hand from
touching the dangerous area.
7. Transformer Jaws: designed to pick up the
AC current owing through the conductor.
It could transfer current to voltage. The
tested conductor must vertically go through
the jaw center.
(gure 1)

Functional Buttons and auto power
off
1. HOLD
Press HOLD to enter and exit hold mode. Press
and hold HOLD button while turning on the
Meter, auto power off be canceled.
2. MAX
Press MAX to start recording and updating of
maximum values.
3. SELECT
Under Ωranging, resistance
measurement mode is default, press SELECT
to select continuity measurement mode or diode
measurement mode.
4. Auto power off
To preserve battery life, the Meter automatically
goes into a “sleep” mode if you do not press any
button for around 10 minutes. The Meter can be
activated by pressing any effective button (refer
to The Effectiveness of Functional Buttons),
then returns to the display for the function
selected previously.
5. Buzzer
The buzzer phonate go with every time button
be effectual pressed. When the meter will auto
power off in 1 minute the buzzer beeps five
times. Before power off there will be a long time
buzzer beeps.
6. The Effectiveness of Functional Buttons
Not every functional buttons can be used on
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UT202A Operating Manual

every rotary switch positions. Below table
describe which functional buttons can be used
on which rotary switch positions
Rotary Functional Buttons
Switch SELECT MAX HOLD
Positions
Ω • N/A •
N/A • •
N/A • •
A 20A N/A • •
A 200A N/A • •
A 600A N/A • •
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UT202A Operating Manual

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UT202A Operating Manual
Display Symbols (see gure 2)
(gure 2)
Number Meaning
1 Indicator for AC voltage or current
2 Indicator for DC voltage
3 The battery is low.
Warning: To avoid false readings, which
could lead to possible electric shock or
personal injury, replace the battery as soon as
the battery indicator appears.
4 The Meter is in the auto range mode in
which the Meter automatically selects
the range with the best resolution.
5 Test of diode
6 The continuity buzzer is on
7 Maximum reading displayed
8 Data hold is active
9 Amperes (amps). The unit of current.
10 Ω: Ohm. The unit of resistance.
kΩ:Kilohm. 1000 ohms
MΩ:Megohm. 1,000,000 ohms
11 V: Volts. The unit of voltage.
mV: Millivolt. 0.001 volts
12 Indicates negative reading

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UT202A Operating Manual
Measurement Operation
A. DC Voltage Measurement (see gure 3)
Warning
To avoid harms to you or damages to the Meter
from eletric shock, do not attempt to measure
voltages higher than 600V AC/DC.
To measure DC voltage, connect the Meter as
follows:
1. Insert the red test lead into the
terminal and the black test lead into the
COM terminal.
2. Set the rotary switch to .
3. Connect the test leads across with the object
being measured.
The measured value shows on the display.
VΩ
(gure 3)

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UT202A Operating Manual
Note:
When DC voltage measurement has been
completed, disconnect the connection between
the testing leads and the circuit under test and
remove testing leads from the input terminals.
B. AC Voltage Measurement (see gure 4)
Warning
To avoid harms to you or damages to the Meter
from eletric shock, do not attempt to measure
voltages higher than 600V AC/DC.
To measure AC voltage, connect the Meter as
follows:
1. Insert the red test lead into the
terminal and the black test lead into the
COM terminal.
2. Set the rotary switch to .
3. Connect the test leads across with the object
being measured.
The measured value shows on the display.
VΩ
(gure 4)

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UT202A Operating Manual
Note:
When AC voltage measurement has been
completed, disconnect the connection between
the testing leads and the circuit under test and
remove testing leads from the input terminals.
C. Measuring Resistance (see gure 5)
Warning
To avoid damages to the Meter or to the
devices under test, disconnect circuit power and
discharge all the high-voltage capacitors before
measuring resistance.
To measure resistance, connect the Meter as
follows:
1. Insert the red test lead into the
terminal and the black test lead into the
COM terminal.
2. Set the rotary switch to ; resistance
measurement (Ω) is default or press
SELECT button to select Ωmeasurement
mode
3. Connect the test leads across with the object
being measured.
The measured value shows on the display.
Note:
● To remove the objects being tested from
the circuit when measuring can obtain a more
accurate result.
● When resistance measurement has been
completed, disconnect the connection between
the testing leads and the circuit under test and
remove testing leads from the input terminals.
Ω
VΩ

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UT202A Operating Manual
D. Testing Diodes (see gure 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.
To test the diode out of a circuit, connect the
Meter as follows:
1. Insert the red test lead into the
terminal and the black test lead into the
COM terminal.
2. Set the rotary switch to 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.
Ω
VΩ
(gure 5)

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UT202A Operating Manual
Note:
● To remove the objects being tested from
the circuit when measuring can obtain a more
accurate result.
● When diode testing has been completed,
disconnect the connection between the testing
leads and the circuit under test and remove
testing leads from the input terminals.
E. Testing for Continuity (see gure 7)
Warning
To avoid damages to the Meter or to the
devices under test, disconnect circuit power and
discharge all the high-voltage capacitors before
measuring continuity.
To test for continuity, connect the Meter as
follows:
1. Insert the red test lead into the
terminal and the black test lead into the
COM terminal.
VΩ
(gure 6)

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UT202A Operating Manual
Ω
(gure 7)
2. Set the rotary switch to and press
SELECT button to select measurement
mode.
3. The buzzer sounds if the resistance of a
circuit under test is less than 10Ω.
4. The buzzer may or may not sounds if the
resistance of a circuit under test is more than
10Ω.
Note:
When continuity testing has been completed,
disconnect the connection between the testing
leads and the circuit under test and remove
testing leads from the input terminals.

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UT202A Operating Manual
F. AC Current Measurement (see gure 8)
Warning
To avoid electric shock, never measure current
while the test leads are inserted into the input
terminals and disconnect test leads and tested
circuit connection.
Never attempt an in-circuit current measuremnet
where the open-circuit voltage between the
circuit and the ground is greater than 600V
User proper function, and range for the
measurement.
To measure current, do the following:
1. Set the rotary switch to 20A ,200 A or
600 A .
2. Press the lever to open the transformer jaws.
3. Center the conductor within the transformer
jaw, then release the Meter slowly until the
trasnformer jaw is completely closed, Make
sure the conductor to be tested is placed
at the center of the transformer jaw,
otherwise it will casue deviation. The Meter
can only measure one conductor at a time,
to meausre more than one condutor at a
time will cause deviation.
Note:
When current measurement has been
completed,disconnect the connection between
the conductor under test and the jaw, and
remove the conductor away from the
transformer jaw of the Meter.

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UT202A Operating Manual
(gure 8)

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UT202A Operating Manual
Specications
A. General Specications
● Display: 3 1/2 digits LCD display, Maximum
display 1999
● Auto Polarity Display
● Overloading: Display OL or –OL
● Battery Deciency: Display
● Measurement Speed: Updates 3 times/second.
● Measuremnet Deviation: When the
conductor being meaured is not placed in a
correct position during AC current
measurement, it will cause ±3% reading
deviation.
● Drop Test: 1 meter drop test passed
● Max. Jaw Size: 28mm diameter
● Projected Max. Current conductor size:
26mm diameter.
● Power: 9V battery
● Sleep Mode (can be disabled)
● Dimensions: 76mm x 208mm x 30mm.
● Weight: Approximate 260g (battery included)
B. Environmental Restrictions
● The Meter is suitable for indoor use.
● Altitude: Operating: 2000m
Storage: 10000m
● Safety/ Compliances: IEC 61010 CATII
600V, CATIII 300V over voltage and double
insulation standard.
● Pollution degree: 2
● Temperature and humidity:
Operating: 0℃~30℃ (≤75%R.H);
30℃~40℃ (≤70%R.H);
40℃~50℃ (≤45%R.H);
Storage: -20℃~+60℃ (≤75%R.H)

2019
UT202A Operating Manual
Accurate Specications
Accuracy: ±(a% reading + b digits), guarantee
for 1 year.
Operating temperature: 23℃±5℃
Relative humidity: ≤75%R.H
Temperature coefcient: 0.1×(specied
accuracy) /1℃
A. AC Voltage: Auto ranging
Range Resolution Accuracy
2.000V 1mV
20.00V 10mV ±(1.2%+5)
200.0V 100mV
600V 1V ±(1.5%+5)
Remarks:
● Overload protection:600V rms
● Input impedance: 10MΩ // <100pF
● Displays effective value of sine wave (mean
value response).
● Frequency response: 40Hz~1kHz.
B. DC Voltage: Auto ranging
Range Resolution Accuracy
200.0mV 0.1mV ±(0.8%+3)
2.000V 1mV
20.00V 10mV ±(0.8%+1)
200.0V 100mV
600V 1V ±(1%+3)
Remarks:
● Input impedance: 10MΩ
● Overload protectionl: 600V rms