Tenma UT202 User manual

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Table of Contents
Title Page
Overview ------------------------------------------------------------------------------------------------------------------------------- 2
Unpacking Inspection --------------------------------------------------------------------------------------------------------------- 2
Safety Information ------------------------------------------------------------------------------------------------------------------- 2
Rules for Safe Operation ----------------------------------------------------------------------------------------------------------- 3
International Electrical Symbols -------------------------------------------------------------------------------------------------- 4
The Meter Structure ----------------------------------------------------------------------------------------------------------------- 4
Rotary Switch ------------------------------------------------------------------------------------------------------------------------- 5
Functional Buttons ------------------------------------------------------------------------------------------------------------------- 5
The Effectiveness of Functional Buttons ---------------------------------------------------------------------------------------5
Display Symbols ---------------------------------------------------------------------------------------------------------------------- 6
Measurement Operation ------------------------------------------------------------------------------------------------------------7
A. DC Voltage Measurement ---------------------------------------------------------------------------------------------------- 7
B. AC Voltage Measurement ---------------------------------------------------------------------------------------------------- 8
C. Measuring Resistance -------------------------------------------------------------------------------------------------------- 9
D. Testing Diodes ------------------------------------------------------------------------------------------------------------------ 10
E. Testing for Continuity ---------------------------------------------------------------------------------------------------------- 11
F. Temperature Measurement -------------------------------------------------------------------------------------------------- 12
G. AC Current Measurement ---------------------------------------------------------------------------------------------------- 13
Sleep Mode --------------------------------------------------------------------------------------------------------------------------- 14
Specifications ------------------------------------------------------------------------------------------------------------------------- 14
A. General Specifications -------------------------------------------------------------------------------------------------------- 14
B. Environmental Restriction ---------------------------------------------------------------------------------------------------- 15
Accuracy Specifications ----------------------------------------------------------------------------------------------------------- 15
A. AC Voltage ----------------------------------------------------------------------------------------------------------------------- 15
B. DC Voltage ----------------------------------------------------------------------------------------------------------------------- 16
C. Resistance ------------------------------------------------------------------------------------------------------------------------ 16
D. Continuity Test ------------------------------------------------------------------------------------------------------------------- 17
E. Diode Test ------------------------------------------------------------------------------------------------------------------------ 17
F. Temperature ---------------------------------------------------------------------------------------------------------------------- 17
G. AC Current ------------------------------------------------------------------------------------------------------------------------ 18
Maintenance --------------------------------------------------------------------------------------------------------------------------- 18
A. General Service ----------------------------------------------------------------------------------------------------------------- 18
B. Replacing the Battery ---------------------------------------------------------------------------------------------------------- 19

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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 UT202 (hereafter referred to as “the Meter”) are 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, Temperature(°F/ °C), Diodes, Continuity and so on.
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 Quantity
1English Operating Manual 1 piece
2Test Lead 1 pair
3Point Contact Temperature Probe (UT202 only) 1 piece
41.5V Battery (AAA) 2 pieces
In the event you find any missing or damage, please contact your dealer immediately.
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 8.

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Rules For Safe Operation (1)
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.
••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 Meter’s terminals and the grounding to avoid electric shock and damages to the
Meter.
Rules For Safe Operation (2)
••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.
••The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident.

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Rules For Safe Operation (2)
••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.
International Electrical Symbols
AC (Alternating Current).
DC (Direct Current).
AC or DC.
Grounding.
Double Insulated.
Deficiency of Built-In Battery
Continuity Test.
Diode.
Capacitance Test
Fuse.
Warning. Refer to the Operating Manual.
Conforms to Standards of European Union.
The Meter Structure (see figure 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 flowing through the conductor.
It could transfer current to voltage.
(Figure 1)

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Rotary Switch
Below table indicated for information about the rotary switch positions.
Functional Buttons(1)
Below table indicated for information about the functional button operations.
Rotary
Switch
Position
Function
OFF Power is turned off.
AC/DC voltage measurement.
: Diode test.
: Continuity test.
ΩΩΩΩ::Resistance measurement.
°C°F Temperature measurement (UT202 only)
AC current measurement from 0.001A to 400.0A
AC Voltage measurement.
HOLD
••Press HOLD
to enter and exit the Hold mode in any mode, the Meter beeps.
••Press and hold HOLD
button while turning on the Meter to display full icons.
MAX Press MAX to start recording and updating of maximum values.
SELECT
Press SELECT button to switch between ΩΩ
and °C°F.
The Effectiveness of Functional Buttons
Not every functional buttons can be used on every rotary switch positions. Below two tables describe which functional buttons can be
used on which rotary switch positions
Model: UT202
Rotary Switch
Positions Functional Buttons
SELECT MAX HOLD
N/A ••
••••N/A
N/A ••
°F° (K-Type)

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Display Symbols(1) (see figure 2)
No. Symbol Meaning
1AC Indicator for AC voltage or current
2DC 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.
4AUTO The Meter is in the auto range mode in which the Meter
automatically selects the range with the best resolution.
5Test of diode.
6The continuity buzzer is on.
7MAX Maximum reading displayed
8Date hold is active.
9 °C°F
The unit of temperature:
°C: Centigrade temperature
°F: Fahrenheit temperature
10 Ω,kΩ,MΩ
Ω: Ohm. The unit of resistance.
kΩ: kilohm.1 x 103or 1000 ohms.
MΩ: Megaohm. 1 x 106or 1,000,000 ohms.

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Display Symbols(2) (see figure 2)
No. Symbol Meaning
11 AAmperes (amps). The unit of current.
12 mV, V Volts. The unit of voltage.mV: Millivolt.
1x10-3 or 0.001 volts
13 Indicates negative reading
14 OL The input value is too large for the
selected range
Measurement Operation(1)
A. DC Voltage Measurement (see figure 3)
Warning
To avoid harms to you or damages to the Meter from electric shock, do not attempt to measure voltages higher than 600V
AC/DC, although readings may be obtained.
The DC Voltage ranges are: 200.0mV, 2.000V, 20.00V, 200.0V and 600V.
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.
(Figure 3)

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Note
••In each range, the Meter has an input impedance of 10MΩ. This loading effect can cause measurement errors in high impedance
circuits. If the circuit impedance is less than or equal to 10kΩ, the error is negligible (0.1 or less).
Measurement Operation(2)
B. AC Voltage Measurement (see figure 4)
Measurement Operation(3)
••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.
(Figure 4)
Warning
To avoid harms to you or damages to the Meter from electric shock, do not attempt to measure voltages higher than 600V AC/DC,
although readings may be obtained.
The AC Voltage ranges are: 2.000V, 20.00V, 200.0V and 600V.
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.
Note
••In each range, the Meter has an input impedance of 10MΩ. This loading effect can cause measurement errors in high impedance
circuits. If the circuit impedance is less than or equal to 10kΩ, the error is negligible (0.1 or less).

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••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 figure 5)
(Figure 5)
Warning
To avoid harms to you, do not attempt to input voltages higher than 60V DC or 30V rms AC.
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.
Measurement Operation(4)
The resistance ranges are: 200.0Ω, 2.000kΩ, 20.00kΩ,200kΩ,2.000M and 20.00MΩ.
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 Ω measurement mode.
3. Connect the test leads across with the object being measured. The measured value shows on the display.
Note:
The test leads can add 0.1Ωto 0.3Ωof error to resistance measurement.
••For high-resistance measurement (>1MΩ), it is normal taking several seconds to obtain a stable reading.
••If Ω reading with shorted test leads is not ≤0.5Ω, check for loose test leads, wrong function selected, or enabled
data hold function.

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••The LCD displays OL indicating open-circuit or the tested resistor value is higher than the maximum range of the Meter.
••Resistance measurement is default to auto range mode. 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.
Measurement Operation(5)
D.Testing Diodes (see figure 6)
(Figure 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.
Use the diode test to check diodes, transistors, and other semiconductor devices. The diode test sends a current through the
semicondutor junction, then measure the voltage drop across the junction. A good silicon junction drops between 0.5V and 0.8V.
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 toΩ
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.

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Measurement Operation(6)
Note
••In a circuit, a good diode should still produce a forward voltage drop reading of 0.5V to 0.8; however, the reverse voltage
drop reading can vary depending on the resistance of other pathways between the probe tips.
••Connect the test leads to the proper terminals as said above to avoid error display.
••The LCD will display OL indicating either open circuit or wrong polarity connection.
••The unit of diode is volt (V), displaying the forward voltage drop readings.
••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 figure 7)
Measurement Operation (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.
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 50Ω.
4. The buzzer may or may not sounds if the resistance of a circuit under test is between 50Ωto 120Ω.
5. The buzzer does not sound if the resistance of a circuit under test is higher than 120Ω.

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Note
••The buzzer beeps once when pressing any buttons at any rotary switch positions except at 2/20A positions if the button is valid. If
the button is not valid, it does not beep. At 2/20A rotary switch position, the buzzer is set not to beep.
••The buzzer beeps 5 times continuously on around 1 minute before entering the sleep mode. When it is just before entering the
sleep mode, it will have one long beep to warn you.
••The LCD displays OL indicating the circuit being tested is open.
••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.
Measurement Operation(8)
F. Temperature Measurement (UT202 Only) (see figure 8)
The temperature measurement ranges are -40°C to 1000°C and -40°F to 1832°F.
To measure temperature, connect the Meter as follows:
1. Insert the red temperature probe into the
terminal and the black temperature probe into the COM terminal.
2. Set the rotary switch to °F°C and press SELECT button to select oF oroC measurement mode. °C measurement mode is default.
3. Place the temperature probe to the object being measured. The measured value shows on the display.
Note
••The Meter automatically displays the temperature value inside the Meter when there is no temperature probe connection.
••When temperature measurement has been completed, disconnect the connection between the temperature probe and the circuit
under test, and remove the temperature probe away from the input terminals of the Meter.

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Measurement Operation(9)
G. AC Current Measurement (see figure 9)
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 measurement where the open-circuit voltage between the circuit and the ground is greater than
600V
Use proper function and range for the measurement.
The measuremnet ranges of current are: 2.000A, 20.00A, 200.0A and 400A.
To measure current, do the following:
1. Set the rotary switch to 2/20A~or 200/400A~
2. Press the lever to open the transformer jaws.
3. Center the conductor within the transformer jaw.
The measured value shows on the display, it is a effective value of sine wave (mean value response).
Measurement Operation(10)
Note:
••To obtain accurate reading, measure only one conductor at each time.
••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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Sleep Mode
To preserve battery life, the Meter automatically turns off if you do not turn the rotary switch or press any button for around 15
minutes.
The Meter can be activated by turning the rotary switch or pressing any button with the following conditions:
1) When the Meter is entered Sleep Mode at temperature functions of Model: UT202, the Meter cannot be activated by turning the
rotary switch to AC current ranges.
2) By pressing any button must be according to”The Effectiveness of Functional Buttons” on page 12
3) The Hold function will be cancelled if the Meter is activated by pressing the HOLD button.
To disable the Sleep Mode function, press and hold HOLD button while turning on the Meter.
Specifications
A. General Specifications:
••Maximum voltage including transient overvoltage between any terminals and grounding: 500V rms.
••Display : 3 1/2 digits LCD display, Maximum display 1999
••Auto Polarity Display
••Overloading : Display OL or –OL
••Battery Deficiency : Display
••Measurement Speed : Updates 3 times/second.
••Measurement Deviation : When the conductor being measured is not placed in a correct position during AC current
measurement, it will cause 1% reading deviation.
••Drop Test : 1 meter drop test passed.
••Max. Jaw Size : 28mm diameter.
••Projected Max.
Current conductor size : 26mm diameter.
••Power : 2pcs of 1.5V battery (AAA)
••Battery Life : typically 150hours (alkaline battery)
••Sleep Mode (can be disabled)
••Dimensions (H x W x L) : 30mm x 76mm x 208mm.
Weight : Approximate 260g (battery included)

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B. Environmental Restrictions:
••The Meter is suitable for indoor use.
••Altitude : Operating: 2000m
Storage: 10000m
••Safety/ Compliances : IEC 61010 CAT.II 600V, CAT.III 300V over voltage and double insulation standard.
••Temperature and humidity : Operating: 0°C to 30°C ( 75%R.H); 30°C to 40°C ( 70%R.H); 40°C to 50°C ( 45%R.H);
Storage: -20°C to +60°C ( 75%R.H)
Accurate Specifications(1)
Accuracy : ±(a% reading + b digits), guarantee for 1 year.
Operating temperature : 23°C ±5°C
Relative humidity : ≤75%R.H
Temperature coefficient : 0.1x(specified accuracy)/1°C
A. AC Voltage: Auto ranging
Range Resolution Accuracy Overload
Protection
2.000V 1mV
±(1.2%+5)
600V rms
20.00V 10mV
200.0V 100mV
600V 1V ±(1.5%+5)
Remarks:
••Input impedance : 10MΩ//<100pF”
••Displays effective value of sine wave (mean value response).
••Frequency response : 40Hz to 1kHz.
••To adjust reading in accordance with effective value

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B. DC Voltage: Auto ranging
Range Resolution Accuracy Overload
Protection
200.0mV 0.1mV ±(0.8%+3)
600V rms
2.000V 1mV
±(0.8%+1)
20.00V 10mV
200.0V 100mV
600V 1V ±(1%+3)
Remarks: Input impedance: 10MΩ.
Accurate Specifications(2)
C. Resistance: Auto ranging
Range Resolution Accuracy Overload
Protection
200.0Ω100mΩ ±(1.2%+2)
600Vp
2.000kΩ1Ω
±(1%+2)
20.00kΩ10Ω
200.0kΩ100Ω
2.000MΩ1kΩ±(1.2%+2)
20.00MΩ10kΩ ±(1.5%+2)
Remarks: Input impedance: 10MΩ.

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D. Continuity Test
Range Resolution Accuracy Overload
Protection
100mΩAround ≤ 50Ω
buzzer beeps
600Vp
Remark:
••Open circuit voltage approximate 0.45V.
••The buzzer may or may not beeps when the resistance of a circuit under test is between 50Ωand 120Ω
The buzzer may not beep when the resistance of a circuit under test is greater than 120Ω.
Range Resolution Accuracy Overload
Protection
1mV Display approximate
forward voltage drop
: 0.5V to 0.8V
600Vp
Remarks: Open circuit voltage approximate 1.48V.
Range Resolution Accuracy Overload
Protection
-40 to 1000°C1°C
-40 to 0°C: ±(3%+4)
600Vp
0 to 400°C: ±(1%+3)
400 to 1000°C: ±(2%+10)
-40°F to 1832°F 1°F
-40 to 32°F: ±(3%+8)
32°F to 752°F: ±(1%+6)
752°F to 1832°F: ±(2%+18)
E. Diode Test
Accurate Specifications(3)
F. Temperature (UT202 Only):

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G. AC Current: Auto ranging
Range Resolution Accuracy Frequency
Response
Overload
Protection
2.000A 0.001A <1A(4%+40)
≥1A(3%+30)
50Hz to 60Hz 400A rms
20.00A 0.01A
±(3%+12)
≤4A
±(2%+8)
200.0A 0.1A ±(1.5%+5)
400A 1A
Remarks:
••Displays effective value of sine wave (mean value response).
To adjust reading in accordance with effective value
MAINTENANCE(1)
This section provides basic maintenance information including battery replacement instruction.
Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance
test, and service information.
To avoid electrical shock or damage to the Meter, do not get water inside the case.
A. General Service
••Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents.
••To clean the terminals with cotton bar with detergent, as dirt or moisture in the terminals can affect readings.
••Turn the Meter power off when it is not in use.
••Take out the battery when it is not using for a long time.
••Do not use or store the Meter in a place of humidity, high temperature, explosive, inflammable and strong magnetic field.
Warning

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B. Replacing the Battery (see figure 10)
MAINTENANCE(2)
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
.
Make sure the transformer jaw and the tets leads are disconnected from the circuit being tested before opening the case bottom.
To replace the battery:
1. Turn the Meter off and remove all the connections from the input terminals
2. Turn the Meter’s case top down.
3. Remove the screw from the battery compartment, and separate the battery compartment from the case bottom.
4. Remove the old battery from the battery compartment.
5. Replace the battery with 2 pieces of new 1.5V (AAA) battery.
6. Rejoin the case bottom and the battery compartment, and reinstall the screw.
Disclaimer This data sheet and its contents (the "Information") belong to the Premier Farnell Group (the "Group") or are licensed to it. No licence is granted for the use of it other than for information purposes
in connection with the products to which it relates. No licence of any intellectual property rights is granted. The Information is subject to change without notice and replaces all data sheets previously supplied.
The Information supplied is believed to be accurate but the Group assumes no responsibility for its accuracy or completeness, any error in or omission from it or for any use made of it. Users of this data
sheet should check for themselves the Information and the suitability of the products for their purpose and not make any assumptions based on information included or omitted. Liability for loss or damage
resulting from any reliance on the Information or use of it (including liability resulting from negligence or where the Group was aware of the possibility of such loss or damage arising) is excluded.
This will not operate to limit or restrict the Group's liability for death or personal injury resulting from its negligence. TENMA is the registered trademark of the Group. © Premier Farnell plc 2010.
Part Number Table
Description Part Number
Clamp Meter, with Temperature UT-202