UNI-T UT203+ User Manual
The UNI-T UT203+ is a versatile true RMS AC/DC clamp meter designed for safe and reliable electrical measurements. With its automatic range and full-function protection, it ensures user safety and accurate readings up to 1000A current. Key features include:
- True RMS measurement for precise AC/DC voltage and current readings
- Audio-visual NCV electric field detection for non-contact voltage sensing
- High voltage frequency range (10Hz-60kHz) and low voltage frequency range (60Hz-10MHz) for a wide range of applications
- Large capacitance measurement (up to 40mF) and temperature measurement (with K-type probe) for added versatility
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P/N:110401108881X
UT203+/UT204+
AC/DC Clamp Meters
User Manual
Preface
Thank you for purchasing the new clamp meter . In order to use this product safely and correctly, please read this manual thoroughly, especially the Safety Instruction part.
After reading this manual, it is recommended to keep the manual at an easily accessible place, preferably close to the device, for future reference.
Limited warranty and liability
Uni-Trend guarantees that the product is free from any defect in material and workmanship within one year from the purchase date. This warranty does not apply to damages caused by accident, negligence, misuse, modification, contamination and improper handling. The dealer shall not be entitled to give any other warranty on behalf of Uni-Trend. If you need warranty service within the warranty period, please contact your seller directly.
Uni-Trend will not be responsible for any special, indirect, incidental or subsequent damage or loss caused by using this device. As some countries or regions do not allow limitations on implied warranties and incidental or subsequent damages, the above limitation of liability may not apply to you.
1. Overview
The UT203+/UT204+ are portable true RMS AC/DC clamp meters with automatic range. They are designed according to EN61010-1
CAT II 600V/CAT III 300V safety standards, and come with full-function protection which ensures users a safe and reliable measurement experience. Aside from basic measurement functions, they also have high precision current scale and high voltage frequency measurement extension. UT204+ also comes with live/neutral wire detection. These meters are great tools for electrical measurements up to 1000A current.
2. Features
True RMS measurement
Audio visual NCV electric field detection
High voltage frequency range: 10Hz~60kHz; low voltage frequency
range: 60Hz~10MHz
UT203+ AC/DC current range: 40A, 400A, frequency response:
45Hz~400Hz
UT204+ AC/DC current range: 60A, 600A, frequency response:
45Hz~400Hz, live/neutral wire detection
ACA/DCA mode memory function for current measurement
Large capacitance (UT203+: 40mF, UT204+: 60mF) and temperature
T
Large LCD and fast refresh rate (3 times/s), capacitance measurement
response time:
≤ 1mF: less than 3s; ≤ 10mF: about 6s; ≤ 60mF: about 8s
Full-function false detecting protection for up to 600V (3.6kVA)
energy surge; overvoltage and overcurrent alarm
The power consumption without backlight is about 1.8 mA. The
circuit has an automatic power saving function. The consumption
in sleep state is <11uA, which effectively extends the battery life to
400 hours.
Please read the safety and warning parts in this manual thoroughly.
Caution: Please read the safety instructions carefully before use.
3. Standard Accessories
Open the package and check the below items, if any is missing or damaged, please contact your supplier immediately:
User manual ----------------------- 1 pc
Test leads --------------------------- 1 pair
K-type temperature probe ------ 1 pc (Only UT204+)
Cloth bag ---------------------------- 1 pc
4. Safety Instructions
The meter is designed according to EN61010-1, 61010-2-032/033 and electromagnetic radiation protection EN61326-1 safety standards, and conforms to double insulation, CAT II 600V, CAT III 300V and pollution grade II. In case the meter is not used properly as instructions, the protection provided may be weakened or lost.
Do not use the tester or test leads if they appear to be damaged.
Do not use the meter if the rear or battery cover is open.
Keep fingers behind finger guard and do not touch the live parts to
prevent electric shock.
The function switch should be correctly set before measurement.
It is forbidden to switch scale during measurement or damage may
occur!
Do not apply AC/DC voltage over 600V to any terminal to prevent
electric shock or damage.
Use caution to avoid shock hazard when working with voltages
above DC 60V, or AC 30Vrms.
Never input voltage or current which exceeds the specified limit.
Maximum range should be selected if measured value is unknown.
Before measuring resistance, diode and continuity, please disconnect
all power and fully discharge all capacitors to avoid inaccuracy.
When the “ ” symbol appears on the LCD, please replace the
batteries in time to ensure measurement accuracy. Batteries should
be removed If the meter is long-term idle.
Do not change the internal circuit of the meter to avoid damage to
the meter and user!
Do not expose the meter in high temperature/humidity, flammable,
explosive or intense magnetic environments.
Clean the meter casing with a soft cloth and mild detergent.
Do not use abrasives or solvents!
5. Symbols
Symbol Description
Caution, possibility of electric shock
Alternating current
Direct current
Equipment protected throughout by double insulation or reinforced insulation
Earth (ground) terminal
Warning or caution
6. General Specifications
Polarity display: Auto
Overload display: “OL” or “- OL”
Low battery indication: “ ” means low battery
Low battery shutdown prompt: The “Lo.bt” interface appears on LCD
and lasts for about 10s, the buzzer beeps 3 times, and the meter
automatically shuts down.
Test position error: If the source under test is not placed at the center
of the clamp jaws when measuring current, ±1.0% additional error in
reading may be produced.
Drop protection: 1m
The maximum size of jaw opening: 28mm in diameter
Battery: AAA 1.5V battery × 2
Auto power off (adjustable): The meter will auto power off if there is no
operation for 15 min.
Dimensions: 215mm × 63.5mm × 36mm
Weight: About 235g (including batteries)
Altitude: 2000m
Operating temperature and humidity: 0°C~30°C ( ≤ 80%RH), 30°C~40°C
( ≤ 75%RH), 40°C~50°C ( ≤ 45%RH)
Storage temperature and humidity: -20°C~+60°C ( ≤ 80%RH)
Electromagnetic compatibility: RF=1V/m, overall accuracy=specified
accuracy+5% of range; RF>1V/m, no specified calculation
7. External Structure (Picture 1)
1) NCV sensing end
2) Clamp jaws
3) Hand guard
4) LED indicator
5) Jaw opening trigger
6) Function scale knob
7) LCD display
8) Function buttons
9) Signal input jack (red and positive +)
10)COM input jack (black and negative -)
Picture 1
8. Button Description
SELECT Button
In composite scale, press this button to switch between the corresponding functions or ranges;
HOLD/BACKLIGHT Button
Short press this button to enter/exit the data hold mode, and long press
(about 2s) this button to turn on/off the backlight.
MAX/MIN Button
(valid for ACV/DCV, ACA/DCA, “C/”F, resistance and capacitance scales)
Short press this button to enter the maximum/minimum measurement mode and long press this button to exit.
REL Button
(valid for ACV/DCV, DCA, “C/”F and capacitance scales).
Press this button to store the current reading as a reference for future readings. When the LCD display value is reset to zero, the stored reading will be subtracted from the future readings. Press this button again to exit the relative value mode.
9.Operating Instructions
9.1 AC/DC Current Measurement (Picture 2)
Select the corresponding current range.
Press the trigger to open the clamp jaws, and fully enclose one conductor.
Only one conductor can be measured at a time, or the measurement
reading will be wrong.
Caution:
Do not insert the testing leads during current measurement to avoid
electric shock.
The current measurement must be taken with safeguard protection.
Press the REL button to return to zero before the DC current measurement,
and meanwhile the center hole of jaw should be perpendicular to the
current direction to ensure accuracy.
The open circuit zeroing reading may be relatively large after (high) DC
current measurement. Please perform the AC current detection again to
counteract the remanence signal by alternating electric field.
Current Measurement
Picture 2
9.2 AC/DC Voltage and Voltage Frequency (% duty cycle)
Measurement (Picture 3)
Select the corresponding function scale.
Insert the red test lead into the “positive” jack, and the black into
the “COM” jack.
Connect test leads with both ends of the measured objects.
Caution:
Do not input voltage above 600V to prevent electric shock or damage.
The input impedance of each range scale is 10M
Ω, this load effect
in high resistance measurement may cause error. If the input
impedance is lower than 10k
Ω, the error can be ignored (
≤
0.1%).
Be cautious to avoid electric shock when measuring high voltage.
Please check the functions by applying a known voltage before use.
Red
Picture 4
9.4 Temperature Measurement (UT202+ only, Picture 5)
Select the temperature measurement function scale.
Insert K-type thermocouple to the meter, fix the temperature probe
on the measured object, and read after the value is stable.
Picture 5
Red
Black
Black
Picture 3
9.3 Continuity Test/Resistance/Diode/Capacitance
Measurement (Picture 4)
Select the corresponding function scale.
Insert the red test lead into the “ ” jack, and the black
into the “COM” jack.
Connect test leads with both ends of the measured object.
Caution:
Do not input voltage above DC 60V or AC 30V to avoid personal
injury.
Please disconnect all the other parts of the circuit to avoid inaccuracy.
Before the resistance online measurement, please do disconnect
all the power and fully discharge all capacitors to avoid injury or
device damage.
If the resistance is over 0.5
Ω when the test leads are short-circuited,
please check the test leads for looseness or other abnormalities.
If the measured resistor is open or the resistance exceeds the
maximum range, the LCD will display “OL”.
Measured value = displayed value – probe short circuit value
It is recommended to use “REL” measurement mode for capacitance
less than 100nF.
Capacitance
Continuity
Diode
Resistance
Red Black
9.5 NCV AC Electric Field Sensing and Live/Neutral Wire
Measurement (Picture 6a)
9.5.1 AC Electric Field Sensing
The electric field sensing sensitivity is divided into two levels
(“EFHI” and “EFLo”). The meter defaults to “EFHI”. Users can select different sensitivity levels according to the intensity of the measured electric field. Select "EFHI" of NCV when electric field is around 220V
AC 50Hz/60Hz. Bring the NCV sensing end close to a charged electric field (socket, insulated wire, etc.). The LCD will display the segment
"-" with beeps and red LED flashing. As the intensity of the measured electric field increases, the more segments (----) display , the higher frequency of buzzer beeps and LED flashes. Select “EFLo” when the electric field is around 110V AC 50Hz/60Hz.
Caution:
Use the NCV sensing end to approach measured electric field, otherwise the measurement sensitivity will be affected. When the measured electric field voltage is over 100V AC, observe whether the conductor is insulated to avoid personal injury.
9.5.2 Live/Neutral Wire Measurement (only UT204+) (Picture 6b) a. Select the LIVE function scale. b. Insert the red test lead into the “ ” jack, make the black test lead suspended, and use the red test lead to touch the socket or bare wire to distinguish the live/neutral wire. c. When the neutral wire or uncharged object is detected, the "----" is
displayed. d. When the >60V AC "live wire" is detected, the LCD will display
"LIVE" accompanied by audio/visual indication.
Caution:
When using this function, in order to avoid the COM input interference,
which will affect the electric field and the accuracy, please pull the
black test lead out of the COM input.
Do keep your hand away from the meter casing. The accuracy may
be unstable under the dense high-voltage. In this case, it should
be judged by LCD and sound frequency together.
Red
Picture 6a
Picture 6b
9.6 Others
Auto power off: The meter will automatically power off to save power
if there is no operation for 15 min. You can wake it up by pressing
any button or restart it after turning the switch to OFF.
Press and hold the SELECT button in off state and then turn on the
meter again to disable the auto power off function. Restart the meter
after shut it down to resume this function.
Buzzer: When any button is pressed or the function switch is turned,
if it is valid, the buzzer will make one beep (about 0.25s). The buzzer
will also beep intermittently to indicate the over range during the
voltage or current measurement.
Low battery detection: The battery voltage will be automatically
detected as long as the meter is on. If it is lower than 2.6V, the LCD
will display the “ ” symbol.
Low battery shutdown function: When the battery voltage is lower
than 2.5V, the LCD displays the “ ” symbol, the “Lo.bt” interface
appears and lasts for about 10s, the buzzer makes consecutive
beeps 3 times, and then the meter automatically shuts down (no interface is displayed).
10. Technical Specifications
Accuracy: ± (%reading + counts), the calibration period is 1 year.
Ambient temperature and humidity: 23°C±5°C;
≤
80%RH.
Temperature coefficient: the accuracy assured temperature condition is 18°C-28°C, the range of ambient temperature fluctuation is stable within ±1°C. When the temperature is less than 18°C or over 28°C, the additional temperature coefficient error is 0.1 x (specified accuracy)/°C.
10.1 Current Measurement
AC Current
Range
UT203 +
40.00A
400.0A
UT204 +
60.00A
600.0A
Resolution
0.01 A
0.1 A
Accuracy
±( 2%+5)
DC Current
UT203 +
40.00A
400.0A
Range
UT204 +
60.00A
600.0A
Resolution
0.01 A
0.1 A
Accuracy
±( 2%+5)
Caution:
Accuracy guarantee range: 5%~100% of range
When the measured current reaches the warning value, there
will be an alarm sound (UT203+: 410A, UT204+: 610A)
With DC current DCA mode, LCD may display non-zero value
in open circuit state, users can press "REL" button to clear display
to zero before each measurement.
10.2 Voltage Measurement
DC Voltage
Range
UT203 +
400.0mV
4.000V
40.00V
400.0V
600V
UT204 +
600.0mV
6.000V
60.00V
600.0V
Resolution
0.1mV
0.001V
0.01V
0.1V
1V
Accuracy
±( .
% + 3 )
±( .
% + 2 )
AC Voltage/Voltage Frequency
UT203
+
4.000V
Range
UT204
+
6.000V
40.00V
400.0V
60.00V
600.0V
600V
Voltage Frequency
10Hz ~ 60KHz
Resolution
0.001V
0.01V
0.1V
1V
0.01Hz
~ 0.01kHz
Accuracy
±( .
% + 5 )
±( .
% + 5 )
Caution:
UT203+: short press "SELECT” in AC voltage/Hz scale to enter the Hz function;
UT204+: long press "SELECT" to enter/exit the Hz function, the input range over 5V.
The input impedance is about 10M Ω
Current/voltage frequency response: 45Hz ~ 400Hz, displays true RMS value
Accuracy guarantee range: 1%~100%
AC crest factor of non-sinusoidal wave can reach 3.0 at 4000 counts while can only reach 1.8 at 6000 counts, the additional error should be added for the corresponding crest factor as follows:
A. Add 3% when the peak factor is 1 ~ 2
B. Add 5% when the peak factor is 2 ~ 2.5
C. Add 7% when the peak factor is 2.5 ~ 3
10.3 Continuity/Diode Measurement
Function Range Resolution
400.0Ω/600.0Ω
4.000V/6.000V
Accuracy
≤ 10Ω: Consecutive beeps
≥31Ω: No beep
The median: uncertain
The open circuit voltage is about 4V
For the silicon PN junction diode, the voltage value is generally about 0.5~0.8V.
10.4 Resistance Measurement
UT203 +
400.0Ω
4.000kΩ
40.00kΩ
Range
UT204 +
600.0Ω
6.000kΩ
60.00kΩ
400.0kΩ
4.000MΩ
40.00MΩ
600.0kΩ
6.000MΩ
60.00MΩ
Resolution
0 001K Ω
0 01K Ω
0 1K Ω
0 001M Ω
0 01M
Ω
10.7 Duty Ratio Measurement
Range
0 .
1 %~ 99 %
Resolution
0 .
1 %
Accuracy
±( .
% + 2 )
±( .
% + 2 )
Caution:
Measured resistance value = displayed value – resistance value of short circuited test leads
Open circuit voltage is about 1V
Overload protection: 600Vrms
10.5 Capacitance Measurement
Range
Resolution
UT203 +
40.00nF
UT204 +
60.00nF
0.01nF
400.0nF
4.000uF
40.00uF
400.0uF
4.000mF
40.00mF
600.0nF
6.000uF
60.00uF
600.0uF
6.000mF
60.00mF
0.1nF
0.001μF
0.01μF
0.1μF
0.001mF
0.01mF
Accuracy
± 10 %
Caution:
Measured value = displayed value - open circuit value of the test leads
(For capacitance ≤ 100nF, “REL” mode is recommended, open circuit
has residual reading). The guaranteed accuracy is 1%~100%.
Overload protection: 600Vrms
10.6 Frequency Measurement
Range
10Hz ~ 10MHz
Resolution
0.01Hz
~ 0.01MHz
Accuracy
± ( 0 .
1 %+ 4 )
Accuracy
±( 3 %+ 5 )
Caution:
Measurement sensitivity:
≤ 100kHz: 200mVrms ≤ input range ≤ 30Vrms;
>100kHz~1MHz: 600mVrms
≤ input range
≤
30Vrms;
>1MHz~10MHz: 1Vrms ≤ input range ≤ 30Vrms.
Duty ratio is only applicable to ≤ 10kHz square wave measurement with a range of 1Vp-p:
If frequency ≤ 1kHz, duty cycle will be 10.0%-95.0%;
If frequency>1kHz, duty cycle will be 30.0%-70.0%.
10.8 Temperature Measurement (UT204+ only)
Range Resolution Accuracy
40 ℃~ 40 ℃
40 ℃~ 500 ℃
500
℃~
1000
℃
40 ℉~ 104 ℉
104 ℉~ 932 ℉
932 ℉~ 1832 ℉
1 ℃
1 ℉
± 4 ℃
±(
1
.
5
%+
5
)
±( 2 .
0 %+ 5 )
± 6 ℉
±( 2 .
0 %+ 6 )
±(
2
.
5
%+
4
)
Caution:
The meter displays "OL" after startup, it is only suitable for K-type thermocouple (Nickel-Chromium ~ Nickel-Silicon temperature sensor) and temperature measurements below 1000°C/1832°F.
The formula for Celsius to Fahrenheit is °F =1.8°C + 32.
10.9
NCV
Range
Electric field sensing sensitivity level
Accuracy
NCV
EFLo
EFHI
The electric field sensing sensitivity is divided into two levels (“EFHI” &
“EFLo”). The meter defaults to “EFHI”. a) AC voltage above 24V±6V can be
sensed. "EFLo" mode is recommended
when the power frequency voltage is
110V. b) "EFHI" can be set in 220V condition.
AC voltage above 74V±12V can be
sensed with getting close to wires,
and identify whether the main socket
is charged or to judge the live/neutral
wire of socket according to the intensity
of sensing.
Note: Test results may be affected by different socket designs or wire I nsulation thickness.
10.10 LIVE Function (UT204+ only)
Range Live wire measurement Accuracy
LIVE
Triggered voltage ≥ AC 60V
(50Hz/60Hz)
1) Display "- - - -" and "AC"
symbol before startup
2) Display "- - - -" when test
neutral wire.
3) Display "LIVE" and symbol
when test live wire, and change
sound and LED flashing
frequency according to the live
wire voltage intensity.
11. Maintenance
Warning: Before opening the rear cover of meter , remove test leads to avoid electric shock.
11.1 General Maintenance
Clean the meter casing with a soft cloth and mild detergent. Do
not use abrasives or solvents!
Do not use the tester or test leads if they appear to have any abnormality.
The maintenance and service must be implemented by qualified professionals or designated departments.
11.2 Battery Replacement (Picture 7)
When the “ ” symbol appears on the LCD, please replace the batteries in time to ensure measurement accuracy. Batteries specification:
2 standard AAA 1.5V batteries.
Operation
Turn off the meter and remove the test leads from the input terminals.
Unscrew the screw of the battery compartment, remove the battery
cover, and take out the used batteries as shown.
Replace the 2 standard AAA batteries according to the polarity
indication.
Picture 7

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