UT-203R - Multimeter Uni-T - Free user manual and instructions

Brand	Uni-T
Model	UT-203R
Product Type	Digital Clamp Meter (Tångamperemeter)
Measurement Category	CAT III 300 V, CAT II 600 V
Display	LCD with max value 4099
Clamp Opening	28 mm diameter
DC Current Range	40.0 A / 400.0 A (Accuracy ±1.5%+5, ±2%+5)
AC Current Range	40.0 A / 400.0 A (Accuracy ±2%+5)
DC Voltage Range	400.0 mV to 600 V (Accuracy ±0.5%+2 to ±0.7%+3)
AC Voltage Range	4.000 V to 600 V (Accuracy ±0.8%+5 to ±1.0%+5)
Resistance Range	400.0 Ω to 40.00 MΩ (Accuracy ±0.8%+2 to ±2.5%+5)
Capacitance Range	40.00 nF to 40.00 mF (Accuracy ±4%+5 to ±10%)
Continuity Test	Buzzer sounds for <10 Ω, no sound for >31 Ω
Diode Test	Open circuit voltage 4 V, silicon P-N junction 0.5–0.8 V
Non-Contact Voltage (NCV)	Dual sensitivity (EFHI ~220 V, EFLo ~110 V)
Frequency Range	45–400 Hz
Auto Shut-off	After 15 minutes of inactivity
Power Supply	2 × AAA/LR03 batteries
Operating Temperature & Humidity	0–30°C (≤80% RH), 30–40°C (≤75% RH), 40–50°C (≤45% RH)
Storage Temperature	-20 to +60°C (≤80% RH)
Dimensions (H×W×D)	215 × 63.5 × 36 mm
Weight	Approx. 235 g with battery
Safety Standards	EN 61010-1, 61010-2-032/033, EN 61326-1
Accessories Included	Test leads, batteries, manual

Frequently Asked Questions - UT-203R Uni-T

How do I measure AC/DC current with the UT-203R?

Set the function selector to the desired current range (40A or 400A). Press SELECT to choose AC or DC. Open the clamp jaws and enclose only one conductor. Keep the conductor centered between the markings. Read the value on the LCD.

What is the maximum voltage I can measure?

The UT-203R can measure up to 600 V DC or 600 V AC RMS. For safety, do not exceed these limits. The meter is rated CAT II 600 V and CAT III 300 V.

How do I replace the batteries?

Disconnect test leads and ensure the clamp is not around a conductor. Turn off the meter. Remove the screw on the battery cover, take out old AAA/LR03 batteries, insert new ones observing polarity, and replace the cover.

What does the NCV function do?

NCV (Non-Contact Voltage) detects live AC voltage without touching wires. Place the NCV sensor near a source. The meter shows dashes, sounds a buzzer, and lights a red LED. Use EFHI for ~220 V and EFLo for ~110 V.

How accurate is the UT-203R for DC voltage?

DC voltage accuracy ranges from ±0.7% + 3 at 400.0 mV to ±0.5% + 2 for higher ranges up to 600 V. Reference conditions: 23±5°C, <75% RH.

Can I measure capacitance with this meter?

Yes, the UT-203R measures capacitance from 40.00 nF to 40.00 mF. For values below 100 nF, use the REL function to zero the display before measurement. Accuracy is ±4%+5 to ±10%.

What does the continuity buzzer indicate?

When measuring continuity, a continuous beep indicates resistance <10 Ω. No beep for >31 Ω. Between 10-31 Ω, the beep is irregular. Always power off the circuit before testing.

How do I use the HOLD and backlight functions?

Press HOLD/ to freeze the reading on the display. Press and hold the same button for about 2 seconds to turn the backlight on or off.

What safety precautions should I follow?

Always inspect the meter and leads for damage before use. Keep fingers behind the finger guards. Do not measure voltages above 600 V. Use the correct range and never change the function selector during a measurement. Replace batteries when the low battery icon appears.

How do I measure resistance?

Turn off power to the circuit and discharge capacitors. Set the function selector to Ω. Connect black lead to COM and red to the V/Ω/Hz input. Touch probes across the component. The display shows resistance. Use HOLD to freeze the reading.

USER MANUAL UT-203R Uni-T

UNI-T UT-203R Digital Clamp Meter

Tångamperemeter Tangamperemeter Pihtiampeerimittari Zangenamperemeter

Art.no

36-8126

Model

UT-203R

Ver. 20201207

Digital Clamp Meter

Art.no. 36-8126 Model UT-203R

Please read the entire instruction manual before using the product and then save it for future reference. We reserve the right for any errors in text or images and any necessary changes made to technical data. In the event of technical problems or other queries, please contact our Customer Services (see address details on the back).

Safety

Warning:

The instruction manual contains information necessary for the safe operation of the clamp meter. Disregarding this information can lead to serious injury or death. Make sure that you have read and understood the entire instruction manual before using the product.

The clamp meter has been tested in accordance with EN 61010-1, 61010-2-032/033 and conforms to the electromagnetic radiation protection standard in accordance with EN61326-1, and also conforms to measurement category CAT III 300 V, CAT II 600 V, and pollution category II.

The function of the clamp meter should be checked on a known voltage source before you start measuring.

• Always check the that the product looks intact and has no damage before using it. Do not use this clamp meter if it or the test leads appear to be damaged, or if you suspect that the tool might not work properly.
• Never use the clamp meter if the battery cover or battery compartment is open.
• Make sure that your fingers are behind the finger guards when using the test leads.
• Set the measurement range with the function knob before starting to take readings. The measurement range must not be changed during a measurement.
• Do not measure voltages higher than 600 V DC or 600 V AC RMS between a power point and earth connection.
• Replace the battery if the battery warning symbol appears on the display. A weak battery can cause incorrect results and thereby pose a safety hazard.
• Neither the clamp meter nor its accessories must be dismantled or modified in any way.

- The clamp meter must not be used or stored in hot temperatures, humid, explosive or flammable environments or near to strong magnetic fields.

To avoid electric shocks you need to be very careful when you work with voltage higher than 60 V DC or 30 V AC RMS. Voltages higher than this pose a risk of powerful electric shocks.

To avoid electric shocks and damage to the meter, the measuring range limits must not be exceeded. The guarantee will not apply if the instrument is used incorrectly.

Symbols

Warning: Risk for potential electric shock. Follow the instructions in this instruction manual.

Warning: Read the information in this instruction manual.

AC (alternating current)

DC (direct current)

AC/DC

Low battery warning symbol

Continuity

Diode

Resistance

Capacitance

Non-contact voltage testing

The clamp meter should not be disposed of in your bin as regular household waste. It should be taken to your local household waste recycling centre for disposal in accordance with local regulations. If you are unsure how to proceed, contact your local council.

Product description

The UT-203R clamp meter is a measuring instrument for measuring DC current, AC current, DC voltage, AC voltage and resistance, as well as performing diode tests and continuity tests. Measurements are carried out with very high accuracy.

1. Function buttons
2. Jaw opening lever
3. NCV sensor
4. Clamp jaws
5. Safety collar
6. LED indicator
7. Function selector
8. LCD display
9. Test lead input jack (red and positive +)
10. Test lead input jack (black and negative -)

Button functions

SELECT

• Press [ SELECT ] to select the function.
• Press [SELECT] to activate the clamp meter if it has gone into standby mode.

HOLD/

- Press and hold the [ HOLD/ ] button for approx. 2 seconds to turn off the backlit display.

MAX/MIN

• Press [ MAX/MIN ] to activate the MAX/MIN measurement function.
• Press and hold in [ MAX/MIN ] to turn off the measurement function.

REL/ZERO

• Press [REL/ZERO] to activate or turn off the REL function.
• Press [REL/ZERO] to save the current measurement for future use. When the LCD display has returned to zero the previous reading will be subtracted from the current reading.

Functions

• Effective voltage, also called RMS measurement (root mean square). The RMS value is used to simplify the calculation of the power in AC circuits.
  • Non-contact sensors for voltage testing
  • Capacitance and resistance measuring
  • Continuity and diode testing
• 600 V overvoltage safety protection

Instructions for use

AC or DC current measurement

Disconnect the test leads from the instrument e measuring any current.

Technical line drawings of a handheld device with no visible text or symbols

1. Set the function selector to the desired measuring function.
2. Press [SELECT] and select the desired measuring function (or appears on the left of the display).
3. Hold the instrument motionless in a firm grip, the measuring sensors are sensitive to vibrations, heat and magnetic fields. Vibrations can cause errors.
4. Press [REL/ZERO] to clear the display.
5. Open the clamp and enclose one of the conductors, keep the conductor in the centre of the clamp and between the markings on the jaws. Close the jaws of the clamp carefully.
   Note: Leave no gap between the jaws of the clamp when measuring. Only measure one conductor at a time; the measurement of several conductors simultaneously can lead to errors.
6. Read the value: press [HOLD/ -] if you have difficulty seeing the display or if you wish to save the reading.
7. Open the jaws of the clamp and move the instrument away from the conductors.
8. Press [HOLD/ ] again to exit the measurement mode.

Measuring direct current (DC) or alternating current (AC) (duty cycle)

In order to avoid personal injury or damage to the instrument, do not measure voltages over 600 V DC or 600 V AC RMS using this clamp meter.

1. Set the function selector to the desired measuring function.

2. Connect the black test lead to the negative COM input terminal and

the red test lead to the positive input terminal.

1. Connect the tips of both test leads to the circuit.
2. Read the displayed value. Press [HOLD/ to save the reading.
3. Disconnect the test leads.

Measuring resistance

⚠️ Before measuring the resistance of a circuit, first turn off the power and make sure that any capacitors in the circuit are discharged.

1. Set the function selector to

2. Connect the black test lead to the negative COM input terminal and the red test lead to the positive input terminal.

1. Connect the tips of both test leads to the circuit.
2. Read the displayed value. Press [HOLD/ to save the reading.
3. Disconnect the test leads.

Measuring capacitance

Note: Use the REL function to measure capacitance lower than 100 nF.

1. Set the function selector to
2. Connect the black test lead to the negative COM input terminal and the red test lead to the positive input terminal.

1. Connect the tips of both test leads to the circuit.

2. Read the displayed value. Press [HOLD/] to save the reading.

3. Disconnect the test leads.

Testing for continuity

⚠️ Before measuring the continuity of a circuit, first turn off the power.

1. Set the function selector to •••

2. Connect the black test lead to the negative COM input terminal and the red test lead to the positive input terminal.

1. Connect the tips of both test leads to the circuit.

2. If the measurement is < 10 the instrument will emit a clear audible signal.

3. If the measurement is >31 Ω the instrument will emit no audible signal.

4. If the measurement is between 10 and 31 Ω the instrument will emit an irregular audible signal.

5. Read the displayed value. Press [HOLD/ ] to save the reading.

6. Disconnect the test leads.

Diode testing

⚠️ Before doing a diode test of a circuit, first turn off the power.

1. Set the function selector to

2. Connect the black test lead to the negative COM input terminal and the red test lead to the positive input terminal.

1. Connect the test leads across the circuit to be tested.
2. Read the displayed value. Press [HOLD/ ];to save the reading.
3. Disconnect the test leads.

Non-contact voltage testing

Note: Select between two measuring levels: EFHI and EFLo. The clamp meter is automatically set to EFHI.

1. Set the function selector to NCV
2. Select EFHI when the test object has a voltage or around 220 V AC 50/60 Hz.
3. Select EFLo when the test object has a voltage of around 110 V AC 50/60 Hz.
4. Place the non-contact voltage sensor close to the object you are measuring such as a wall socket.

1. Read the displayed value. Detected voltage will be indicated by (—), a buzzer sound and a red light. The higher the voltage, the more (----), will be shown, the louder the buzzer will sound and the brighter the red light will shine. Press [HOLD/※if you want to save the reading.

2. Remove the voltage sensor.

Care and maintenance

Avoid electrical shocks or damage to the meter by making sure it stays away from water.

• Clean the clamp meter using a soft cloth and a mild detergent.
• Repairs must only be carried out by a qualified electrician.

Battery replacement

⚠️ Disconnect the test leads form the test object and the clamp meter and make sure that the clamp is not placed around a conductor before changing the batteries.

Change the batteries when the battery symbol appears on the display.

Technical line drawing of a mechanical device with internal components (no text or symbols)

1. Turn the meter off and remove the test leads.
2. Remove the screw holding the battery cover in place.
3. Remove the battery cover.
4. Take out the old batteries.
5. Insert new AAA/LR03 batteries, observing the polarity markings in the battery compartment.
6. Replace the battery cover and refit the screw.

Responsible disposal

This symbol indicates that the product should not be disposed of with general household waste. This applies throughout the entire EU. In order to prevent any harm to the environment or health hazards caused by incorrect waste disposal, the product must be handed in for recycling so that

Symbol of a trash bin crossed with no visible text or labels

the material can be disposed of in a responsible manner. When recycling your product, take it to your local collection facility or contact the place of purchase. They will ensure that the product is disposed of in an environmentally sound manner.

Specifications

Frequency range 45–400 Hz

Display LCD display with a max value of 4099

Polarity indication: "Auto" is shown on the display

Out of range indication "OL" or "-OL" is shown on the display

Low battery warning is shown on the display

Batteries AAA/LR03 × 2

Error If the conductor is not placed in the centre of the clamp, an error of ± 1% may occur

Clamp opening 28 mm in diameter

Automatic shut-off After 15 minutes when it has not been used

Measurement category CAT II 600 V CAT III 300 V

Standard compliance EN 61010-1, 61010-2-032/033, and EN 61326-1

Operating temperature/ humidity 0–30 °C (≤ 80 % RH), 30–40 °C (≤ 75 % RH), 40–50 °C (≤ 45% RH)

Storage temperature -20 to +60 °C (≤ 80 % RH)

Dimensions 215 × 63.5 × 36 mm

Weight approx. 235 g with battery

Tångamperemeter

Art.nr 36-8126 Modell UT-203R

Technical line drawing of a handheld electrical clamp or power supply device (no text or symbols visible)

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NORSK

Knappefunksjoner

SELECT

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en tilfredsstillende måte. Når produktet skal kasseres, benytt eksisterende systemer for returhåndtering eller kontakt forhandler. De vil ta hånd om produktet på en miljømessig forsvarlig måte.

Spesifikasjoner

Frekvensområde 45–400 Hz

Skjerm LCD-display med maks verdi på 4099

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Technical line drawing of a mechanical device with internal components and mounting holes (no text or symbols)

Measuring range	Resolution Accuracy
40.0 A 0.01 A	± (2% + 5)
400.0 A 0.1 A	± (2% + 5)

Alternating current (AC)

Measuring range	Resolution Accuracy
40.0 A 0.01 A	± (2% + 5)
400.0 A 0.1 A	± (2% + 5)

DC voltage

Measuring range	Resolution Accuracy
400.0 M V 0.1 mV ± (0.7 + 3)
4.000 V 0.001 V ± (0.5 + 2)
40.00 V 0.01 V ± (0.5 + 2)
400,0 V 0.1 V ± (0.5 + 2)
600 V 1 V	± (0.5 + 2)

AC voltage

Measuring range	Resolution Accuracy
4.000 V 0.001	V ± (1.0 + 5)
40.00 V 0.01 V	± (0.8 + 5)
400.0 V 0.1 V	± (0.8 + 5)
600 V 1 V	± (0.8 + 5)

Resistance

Measuring range	Resolution Accuracy
400.0 Ω	0.1 Ω ± (1.0 + 2)
4.0000 Ω	0.001 KΩ	± (0.8 + 2)
40.00 Ω	0.01 KΩ	± (0.8 + 2)
400.0 Ω	0.1 KΩ	± (0.8 + 2)
4.000 M Ω	0.001 MΩ	± (2.5% + 5)
40.00 M Ω	0.01 MΩ	± (2.5% + 5)

Capacitance

Measuring range	Resolution Accuracy
40.00 nF 0.01	nF ± (4% + 5)
400.0 nF 0.1 nF	± (4% + 5)
4.000 nF 0.001	μF ± (4% + 5)
40.00 μF 0.01	μF ± (4% + 5)
400.0 μF 0.1 μF	± (4% + 5)
4.000 mF 0.001	mF ± 10%
40.00 mF 0.01	mF ± 10%

Continuity

Measuring range	Resolution	Accuracy
400.0 Ω 0.1	Ω ≤10Ω: Continuous signal sound ≥31Ω: No signal Median: Unsafe

Diode

Measuring range	Resolution Accuracy
4.000 V 0.001 V Open circuit voltage: 4 VSilicon P-N junction diode: 0.5–0.8 V

Sverige

Customer Service e-mail: [e-mail]

Returns Address Clas Ohlson Ltd, The Archway,

7-9 West Street, Reading, Berkshire, RG1 1TT

Deutschland

Kundenservice

E-Mail: [e-mail]

Homepage

www.clasohlson.de