UNI-T UT203 is a 3 3/4 digits True RMS multimeter that provides accurate and reliable measurements for both professional and DIY users. With its ability to measure AC/DC voltage, AC/DC current, frequency, duty cycle, resistance, and diodes, the UT203 is a versatile tool for various electrical applications. The meter also features a data hold function to freeze the display, a sleep mode to conserve battery life, and a relative mode to measure changes in a signal. With its compact size and rugged construction, the UT203 is a valuable addition to any toolbox.
UNI-T UT203 is a 3 3/4 digits True RMS multimeter that provides accurate and reliable measurements for both professional and DIY users. With its ability to measure AC/DC voltage, AC/DC current, frequency, duty cycle, resistance, and diodes, the UT203 is a versatile tool for various electrical applications. The meter also features a data hold function to freeze the display, a sleep mode to conserve battery life, and a relative mode to measure changes in a signal. With its compact size and rugged construction, the UT203 is a valuable addition to any toolbox.
Digital Clamp Multimeters
P/N: 41416301
Registered Design No.: ZL02 3 357791.6
UT203/204
Table of Contents
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
Rotary Switch
Functional Buttons
The Effectiveness of Functional Buttons
Display Symbols
Measurement Operation
A. DC/AC Voltage Measurement
B. Measuring Resistance
C. Testing Diodes
D. Testing for Continuity
E. Frequency Measurement
F. Duty Cycle Measurement
G. DC/AC Current Measurement
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Title Page
Model UT203/204: OPERATING MANUAL
1
Sleep Mode
Specifications
A. General Specifications
B. Environmental Requirements
Accuracy Specifications
A. DC Voltage
B. AC Voltage
C. Resistance
D. Diode Test
E. Continuity Test
F. Frequency
G. Duty Cycle
H. DC Current
I. AC Current
Maintenance
A. General Service
B. Replacing the Battery
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Title Page
Model UT203/204: OPERATING MANUAL
2
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 Clamp Multimeter Model UT203/UT204 (hereafter referred to as “the Meter”)
are 3 3/4 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 not only measure AC/DC Voltage, AC/DC Current, Frequency, Duty
Cycle, Resistance, Diodes, Continuity but also it has Data Hold, Sleep Mode and
Relative Mode features.
UT204 has an extra True RMS feature.
Model UT203/204: OPERATING MANUAL
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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
2
3
4
5
English Operating Manual
Test Lead
Test Clip
Carrying Bag
9V Battery (NEDA1604, 6F22 or 006P)
1 piece
1 pair
1 pair
1 piece
1 piece
In the event you find any missing or damage, please contact your dealer immediately.
Model UT203/204: OPERATING MANUAL
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Safety Information
This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage
category (CAT. II 600V, CAT. III 300V) and double insulation.
CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient
overvoltages than CAT. III.
CAT. III: Distribution level, fixed installation, with smaller transient overvoltages than
CAT. IV
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 to.
International electrical symbols used on the Meter and in this Operating Manual are
explained on page 9.
Model UT203/204: OPERATING MANUAL
5
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 specifications 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.
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Model UT203/204: OPERATING MANUAL
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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 are not closed to avoid electric shock.
Do not input higher than 600V between the two Meter’s input terminal 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 fingers behind the finger 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
specifications replacement parts.
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Model UT203/204: OPERATING MANUAL
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When servicing the Meter, use only the same model number or identical electrical
specifications 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 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.
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Model UT203/204: OPERATING MANUAL
8
International Electrical Symbols
AC (Alternating Current)
DC (Direct Current)
AC or DC
Grounding
Double Insulated
Warning. Refer to the Operating Manual
Deficiency of Built-In Battery
Continuity Test
Diode
Fuse
Conforms to Standards of European Union
Model UT203/204: OPERATING MANUAL
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The Meter Structure (see figure 1)
(figure 1)
Input Terminals
LCD Display
Functional Buttons
Rotary Switch
Trigger: press the lever to open the transformer
jaws. When the pressure on the lever is released,
the jaws will close.
Hand Guards: to protect user’s hand from touching
the dangerous area.
Transformer Jaw: designed to pick up the AC and
DC current flowing through the conductor. It could
transfer current to voltage. The tested conductor
must vertically go through the Jaw center.
1.
2.
3.
4.
5.
6.
7.
Model UT203/204: OPERATING MANUAL
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Rotary Switch
Below table indicated for information about the rotary switch positions.
Rotary Switch Position
Power is turned off
AC or DC voltage measurement
Resistance measurement
: Diode test
: Continuity test
Frequency Measurement and Duty
Measurement
AC and DC current measurement range
Function
OFF
V
Hz / Duty%
40A 400A
&
/
Model UT203/204: OPERATING MANUAL
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Functional Buttons
Below table indicated for information about the functional button operations.
Button Operation Performed
Press HOLD to enter the Hold mode in any mode, the Meter beeps.
Press HOLD again to exit the Hold mode, the Meter beeps.
At
and range:
Press to select manual ranging measurement mode. The Meter
is default to auto ranging measurement mode.
When the Meter is at manual ranging measurement mode, press
to step down the range.
At
range:
Press to enter the REL mode.
It subtracts a stored value from the present measurement value
and displays a result.
At Hz/Duty% range:
Press to switch between Hz measurement mode and Duty %
measurement mode.
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HOLD
REL
V
A
Model UT203/204: OPERATING MANUAL
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Button Operation Performed
SELECT
Press SELECT button to select the alternate functions marked in
blue colour on the Meter’s faceplate including Hz, Duty%,
,
, 40 ,
and
400
.
After the Meter entering Sleep Mode, press and hold SELECT to
turn the Meter on, it will disable the Sleep Mode feature.
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A A
Model UT203/204: OPERATING MANUAL
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The Effectiveness of Functional Buttons
Not every functional buttons can be used on every rotary switch positions. Below
table describe which functional buttons can be used on which rotary switch positions
Rotary Switch
Positions
Functional Buttons
SELECT
REL
HOLD
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N/A
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N/A
N/A
V
Hz / Duty%
40A
400A
/
Model UT203/204: OPERATING MANUAL
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Display Symbols (see figure 2)
(figure 2)
4
1
2
3
5
6
8 9
10
12
13
14
16
7
11
15
Model UT203/204: OPERATING MANUAL
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Number Meaning
1
2
3
4
5
6
7
8
9
AC
DC
Symbol
Indicator for AC voltage or current
Indicator for DC voltage
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.
The Meter is in the auto range mode in which the Meter
automatically selects the range with the best resolution.
Test of diode
The continuity buzzer is on
Indicator for Duty.
Data hold is active
Indicator for REL mode
%
Model UT203/204: OPERATING MANUAL
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Number Meaning
10
11
12
13
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16
,k ,M
Hz
A
mV, V
TRMS
OL
Symbol
: Ohm. The unit of resistance.
k : Kilohm. 1x10
3
or 1000 ohms
M : Megohm. 1x10
6
or 1,000,000 ohms
The unit of Frequency
Amperes (amps). The unit of current.
Volts. The unit of voltage.
mV: Millivolt. 1x10
-3
or 0.001 volts
Indicates negative reading
Indicator for TRMS mode
The input value is too large for the selected range
Model UT203/204: OPERATING MANUAL
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Measurement Operation
A. DC/AC Voltage Measurement (see figure 3)
(figure 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, although
readings may be obtained.
The DC Voltage ranges are:
400mV, 4V, 40V, 400V and 600V.
The AC Voltage ranges are:
4V, 40V, 400V and 600V.
To measure DC voltage, connect the Meter as follows:
Insert the red test lead into the Hz Duty% terminal and the black test lead
into the COM terminal.
1.
Red Black
Model UT203/204: OPERATING MANUAL
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When DC/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.
Set the rotary switch to . DC mesaurement mode and auto ranging is a default.
Press SELECT to switch to AC measurement mode or press to switch to
manual ranging measurement mode.
Connect the test leads across with the object being measured.
The measured value shows on the display.
2.
3.
V
REL
Model UT203/204: OPERATING MANUAL
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UNI-T UT203 is a 3 3/4 digits True RMS multimeter that provides accurate and reliable measurements for both professional and DIY users. With its ability to measure AC/DC voltage, AC/DC current, frequency, duty cycle, resistance, and diodes, the UT203 is a versatile tool for various electrical applications. The meter also features a data hold function to freeze the display, a sleep mode to conserve battery life, and a relative mode to measure changes in a signal. With its compact size and rugged construction, the UT203 is a valuable addition to any toolbox.
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