UNI-T TU13BA, TU13BC, TU13BB Operating Manual

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UT139A/B/C

LIMI-T

UT139A/B/C OPERATING MANUAL

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Table of Contents

I. Overview-------------------------------------------------------------------------------------------------------------------------- 1 II. Accessory------------------------------------------------------------------------------------------------------------------------ 1 III. Safety Operation Regulation------------------------------------------------------------------------------------------------ 1 IV. Electric Symbol----------------------------------------------------------------------------------------------------------------2 V. Comprehensive Specification------------------------------------------------------------------------------------------------3 VI. Appearance Structure--------------------------------------------------------------------------------------------------------4 VII. LCD Display-------------------------------------------------------------------------------------------------------------------5 VIII. Knobs and Keys for Range Selection

----------------------------------------------------------------------------------7 IX. Measurement Instruction----------------------------------------------------------------------------------------------------9 X. Technical Index---------------------------------------------------------------------------------------------------------------16 XI. Upkeep and Maintenance-----------------------------------------------------------------------------------------------22

UNI-T

UT139A/B/C OPERATING MANUAL

I. Overview

UT139A/B/C DMM is a small auto range, hand-held 3 1/2~3 5/6 bit true RMS multimeter featuring complete function, novel structure, high reliability and safety as well as large screen for display . It can be used for measuring AC/DC voltage and current, variable frequency voltage (V.F.C), resistance, diode, circuit on-off, capacitance, frequency ratio, NCV non-contact AC voltage sensing and so on, is an ideal portable maintenance instrument for users.

II. Accessory

Unpack and take out the instrument, please check following attachments carefully for completeness or intactness. In case of any shortage or damage, please contact with your supplier.

1. An operating instruction manual

2. A test pen (CATIII 600V)

3. Point-type K( nickel chromium ^nickel silicon) thermocouple (UT139C only)

4. An optional current clamp (UT139C only)

III. Safety Operation Regulation

UT139A/B/C is designed in compliance with standards such as IEC/EN61010-1, pollution grade II, overvoltage (CATIII600V) and double insulation standards. Please comply with operation instruction specified in the Manual; otherwise the protection provided by the instrument may be affected.

1. It is forbidden to use the product without having rear cap in place, or otherwise there will be electric shocking.

2. Prior to use, inspect the insulation layer of test pen for intactness, confirming no breakage and broken line.

3. When LCD display shows the icon “ ”, it is required to replace the battery in time to ensure the measurement accuracy.

4. Range switch shall be set at the correct measurement position.

UT 139A/B/C OPERATING MANUAL

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5. In case of electric shock and damage to the instrument, signals being measured shall not exceed rated limit value.

6. To prevent any damage to the instrument, it is forbidden to change the gear of range switch in measurement.

7. After each measurement, disconnect table pen and the circuit being measured; after the current measurement, especially the measurement of large current, it is necessary to power off before disconnecting table pen and the circuit being measured.

8. In case of electric shock, it is required to be cautious when voltage being measured higher than DC 60V or AC 30Vrms.

9. Do not use the product in high-temperature or high-humidity environment, particularly in the damp environment in where the instrument performance may be severely degraded

10. Refrain from changing the internal wiring in the clamp ammeter to guard against damage to the meter and danger.

11. Clean the meter case with damp cloth and mild detergent rather than the abrasive material and solvent.

IV. Electric Symbol

Low electricity of internal battery

•»)

Buzzing On-off

-H-

Diode AC/DC

Warning

HHh

Battery to be measured

Grounding

Current clamp

Double Insulation Comply with European Union directiv

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UT139A/B/C OPERATING MANUAL

V. Comprehensive Specification

1. Maximum voltage between input terminal and grounding: see instruction about each input terminal protection voltage.

2. 10A terminal (CE) is equipped with: F 10A H 600V fast-acting fuse (06x25) mm

3. mA/|jA terminal (CE) is equipped with: UT139A-FF 0.2A H 600V fast-acting fuse (06x32) mm UT139B-FF 0.5A H 600V fast-acting fuse (06x32) mm UT139C-FF 0.6A H 600V fast-acting fuse (06x32) mm

4. Maximum display: (UT139A): 1999; (UT139B): 4000; (UT139C): 6000Refresh 2—3 times per second, display

“OL” in case of overrange . Capacitance and frequency (only applicable for UT139B/C): 9999 count.

Duty ratio (only applicable for UT139B/C): 1—99.9% Diode: about 2.1V (UT139A) and 3.2V(UT139B/C), displaying “OL” in case of overrange. Range: auto/manual Polarity: auto

Working temperature: 0°C—40°C

Relative humidity: ^75% when 0°C—30°C, and ^50% when 30°C— 40°C Storage temperature: -10°C—50°C

5. Electromagnetic compatibility: In 1V/m radio frequency (RF) field: Overall accuracy=specified accuracy + 5% of range, and no specified index for RF over 1V/m.

6. Operating ASL: 0—2000m

7. Internal battery: AA R6P 1.5V*2

8. Low electricity: LCD displays

9. Contour dimension: about (175x80x48.5) mm

10. Weight: about 350g (inclusive of battery)

11. Safety Standard: IEC/EN 61010-1: CATIII600V; Pollution grade II

12. Accreditation: CE

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UT 139A/B/C OPERATING MANUAL

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VI. Appearance Structure (See Figure 1)

1. Case

2. LCD Display 3/4/7.: Selection buttons

5. Range Switch

6. Measuring input terminal

Figure 1

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UT139A/B/C OPERATING MANUAL

VII. LCD Display (See Figure 2)

139B/C-LCD:

A M kQ H am V>i AF V F % Q ®

SjZj O O jZj

d MAX-MINAuto Range NCV A £

Symbol

Instruction

Data hold prompt

2 —

Negative reading

3 AC/DC

AC/DC measurement prompt

4 MAX-MIN

Maximum/Minimum/Maximum-Minimum value measurement prompt

• a

Under-voltage internal battery

Auto Range Automatic range prompt

139A-LCD:

A MkQmtyA

Q NCV Auto Range MAX-MIN

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UT 139A/B/C OPERATING MANUAL

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-H

Diode measurement prompt

•»)

Circuit on-off measurement prompt

Relative measurement prompt

Q /kQ /M Q

Resistance units: Ohm, Kilohm and Megohm

Hz/kHz/MHZ

requency units: Hz, kHz, MHz

Duty ratio measurement unit

13 mV/V

Voltage units: mV, V

|jA /m A /A

Current units: |jA, mA, A

nF/M F/m F

Capacitance units: nF, u F, mF

°C

Centigrade temperature unit

°F

Fahrenheit temperature unit

(EF)NCV

Non-contact AC voltage sensing

Auto power-off prompt

Current clamp

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UT139A/B/C OPERATING MANUAL

VIII. Knobs and Keys for Range selection

Range Location

Function

AC or DC voltage measurement

Resistance measurement

■H-

Measurement of diode PN junction voltage

•»«

Measurement of circuit on-off

Capacitance measurement

Frequency measurement

Duty ratio masurement

t o

Temperature measurement

iu& mASs lOASi

AC/DC current measurement

60AS* A

AC/DC current clamp measurement

NCV

Non-contact AC voltage sensing

OFF

Switch off internal electric power

Button:

RANGE button: it can be used for selecting auto/manual range. After pressing, it will switch one gear of switch, when reading the highest gear, jump to the lowest gear range and in turn. When the time of pressing button is ^2 s or switching a range, you'll exit the manual range mode. (Only applicable for V ^/ n /I^ )

MAX/MIN button:

it can be used to automatically enter the manual range mode. In such case, auto shutdown function is disabled and maximum value is displayed, after another pressing on the button, the minimum value will be displayed and values are displayed in turn (maximum value-minimum value). When the time of pressing button is ^2s or switching a range, you'll exit data recording mode (only applicable for V^, Q, l^and °C/°F)

UT 139A/B/C OPERATING MANUAL

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REL button:

it can be used to automatically enter the manual range mode. The current displayed value will be taken as

the reference value and then the difference between the measured value and reference value will be displayed,

after another press, you'll exit the relative measurement mode. (Only applicable for V^, Q, °C/T andHfr) The backlight will be illuminated when the time of pressing button is ^2s, after about 15s, the backlight will

be automatically turned off; the backlight will be turned off if pressing the key ^ 2 s when the backlight is illuminated, (Only applicable for UT139Afull range: REL/LIGHT button)

NCV/mV'V button (Only applicable for UT139A):

It can be used to switch NCV/mV'V. For detailed information, see the operation instruction for non-contact

AC voltage sensing.

Hz/% button (only applicable for UT139B/C):

It can be used to select the mode Hz/%, only applicable for the selection of frequency, AC voltage/ current measurement modes.

SELECT button:

it can be used to select range (only applicable for multi-range). Under AC mode, press the button ^2s, display “UFC”, enter V.F.C measurement mode and measure the variable frequency voltage. After another ^ 2 s pressing on the button, display “End” and exit the V.F.C measurement mode.

HOLD button: (Applicable for full range) It can be used to lock and hold the displayed value, in such case, LCD displays the prompt “E l”, after another

press, it is unlocked and enter the normal measurement mode.

The backlight will be illuminated when the time of pressing button is ^2s, after about 15s, the backlight will

be automatically turned off; and the backlight will be turned off if pressing the key ^2 s when the backlight is illuminated, (Only applicable for UT139Afull range: HOLD /LIGHT button)

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UT139A/B/C OPERATING MANUAL

IX. Measurement Instruction

Check the built-in AA 1.5Vx2 battery, display will show the symbol “GS” when lack of power, and then replace battery in time. It is required to pay attention to the symbol “A ” beside the test pen socket, which reminds one of the fact that in case of measurement safety, testing voltage or current shall not exceed the specified value

1. AC and DC Voltage Measurement (See Figure 3)

1) Connect the instrument with the load in parallel for measurement.

2) When the input impedance of the instrument is about 10M Q,

the load may cause measurement error in the circuit with high

impedance. In most cases, the error can be neglected (0.1%

or lower) if the circuit impedance is under 10k

^ Notes:

• It is forbidden to input voltage higher than 600Vrms, despite of the possibility of measuring higher voltage, as it may damage r ^ rl the instrument.

• It is required to avoid the electric shock in measuring high voltage.

(UTI 39A ) (UT 1W B/ C)

RANGE

RANG E

MAX MIN

R£ LA /L BH T l2 Sj

REL A

Hi %

HOLD

H0l D/l tC HT( 2S )

5EL ECT

SEL ECT

VJ .C (A CV )

v.r c (A C v )

AC /O C

UT 139A/B/C OPERATING MANUAL

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2. Resistance Measurement (See Figure 4a)

Connect the instrument with the load in parallel for measurement.

^ Notes:

*. The display will show “OL” when the measured resistance

open-circuit or resistance value exceeds the maximum range of the instrument.

*. Prior to measuring online resistance, it is necessary to switch

off all powers in the circuits to be measured, and release all residual charges to ensure the measurement accuracy.

*. In measuring low resistance, a measurement error in resistance

of about 0.1 Q —0.2 o will be resulted by the test pen. In order to acquire accurate reading, it is required to short circuit the test pen, take REL relative measurement mode to ensure the measurement accuracy.

*. Check the test pen for any loosening or other reasons in case

there is a resistance value no less than 0.5Q when test pen is short circuited.

*. Several seconds may be required for the reading stability when

measuring high resistance, which is normal for high resistance measurement.

*. By using the resistance measurement function, it is allowed

to make self-checking of the built-in fuse, see (Figuer 4b).

*. No input higher than DC 60V or AC 30V is allowed.

(ur uw o j

^ (u rjs B /c)

RAHCE

IIAX HIM

MAX UIN

RC lA/ UG I T(2 S)

REL &

MU )

H0L D/LIGH1 { 2S)

SELE CT

Figuer 4a

}

(UTlUtA) j. (UI13W/ C )

RAMPE m u tt

IUH U N MAX HH

BELA/L(CH T(aS)| BEL A

HO. I) |HOLO/J CH(2 5)

SELGC* | SELECT

Figuer 4b

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UT139A/B/C OPERATING MANUAL

3. Circuit on-off measurement (See Figure 5)

If the resistance of two terminals to be measured is bigger than 15 0 ^, there will be a circuit break and buzzer will make no sound; if the resistance is ^10 Q, the circuit is deemed with good conductivity and buzzer will continuously sound.

^ Notes

*. Prior to measuring online circuit on-off, it is necessary to switch

off all power supplies in the circuits to be measured and release all residual charges to ensure the measurement accuracy.

* To prevent personal injury, it is not allowed to input the voltage

higher than DC 60V or AC 30V.

4. Diode measurement (Figure 6)

“ OL” will be displayed when the diode to be measured is an

open circuit or polarity is reversely connected. For Silicon PN

junction, the normal value is normally 500~800mV.

As. Notes

* Prior to measuring online diode, it is necessary to o switch off all

power supplies in the circuits to be measured and release all residual charges to ensure the measurement accuracy.

* Test voltage for diode is about:

2.1V(UT139A),

3.2V(UT139B/C).

* To prevent personal injury, it is not allowed to input the voltage

higher than DC 60V or AC 30V

UT139A/B/C OPERATING MANUAL

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5. Capacitance measurement

(Only applicable for UT139B/C)

(See Figure 7) The instrument, when without any input, will display a fixed reading which is the internal fixed capacitance value. When measuring small range gear capacitance, the above value shall be subtracted from the value to be measured to ensure the accuracy. The relative measurement REL function can be used to automatically subtract the value to facilitate the measurement.

^ Notes

* The display will show “OL” when the capacitor to be becomes

short-circuited or the capacitance value exceeds the maximum range of the instrument.

* Generally, several seconds will be taken to measure high-capacity

capacitor.

* To prevent damage to the instrument and personal injury, it

is required before testing to release all residual charges, which is particularly important for capacitor with high voltage.

6. Frequency/Duty Ratio Measurement

(Only applicable

(See Figure 8) At the frequency measurement gear, press the button Hz/% to select frequency/duty ratio measurement mode.

^ Notes

* To prevent personal injury, it is not allowed to input the voltage

higher than DC 60V or AC 30V

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UT139A/B/C OPERATING MANUAL

7. Temperature measurement (Only applicable for UT139C)

(See Figure 9) Temperature sensor: It is only applicable for K (Ni-Cr and Ni- Si) thermocouple. After startup, “OL” is displayed, complete Celsius or Fahrenheit temperature measurement by connecting the product with K-type temperature sensor. T=1.8°C+32

Notes

The point type K (Ni-Cr and Ni- Si) thermocouple is only applicable for the measurement of temperature under 230°C/446°F.

8. AC and DC current measurement (See Figure 10)

Connect the instrument with the load in serial for measurement. AC measurement value will be true RMS.

& Notes

Before connecting instrument in serial with the loop to be measured, switch off the power supply. In measurement, it is required to use proper input terminal and function gear; if unable to estimate the current, the measurement should start with the high aea,r range. Fuses are provided inside the 10A, rrwu linput jacks. It is forbidden to connect the table pen test pin in paralfel with any circuit, especially the power supply terminal, which may cause damage to the instrument and personal injury. For security purposes, when measuring current higher than 5A, the time of each measurement should be controlled less than 10s and an interval of at least 15min should be maintained.

When measuring AC current online, it is allowed to press the

button Hz/% to display online AC frequency/ duty ratio.

60AAC and DC current clamp measurement (See Figure 11).

Connect as shown in the figure with the attached current clamp. (Only applicable for UT139C)

(MI MA ) i QJ TUH /C)

RM KE

[ RAHCC

IUX UN

WAX W

KLA /U CH T{ 2Sj

BEL A

Hi x

MI D

HCH0AICHJ{?S)

5UEC T |

*U C T

Figure 10

UT 139A/B/C OPERATING MANUAL

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9. NCV Non-contact AC voltage sensing (See Figure 12)

If need to detect whether there is a AC voltage or electromagnetic field, allow the front end of the instrument be close to the object to be sensed. The analog quantity of sensed AC voltage is about: “EF” is displayed when ^critical voltage.

“ EF” is displayed when UT139A> critical voltage, a five-level sound effect (buzzing sound) is generated according to the voltage Vd to mark the difference of sensed voltage.

is displayed when UT139B/C>critical voltage, “

------

” is designed according to the size of voltage Vd and accompanied by different buzzing sounds to mark the difference of sensed voltage.

By pressing NCV/mV^(only applicable for UT 139A), display the analog quantity of sensed mVMo make the difference of AC voltage.

^ Notes

Test pen is not required for measurement when the range knob switch is set at “NCV”.

10. Battery voltage measurement (only applicable for UT139A)

(See Figure 13) The range gear 1.5V is only applicable for the measurement of b attery ^ 2V , with load resistance of about 51 & , while the range gear 9V is only applicable for the measurement of battery ^ 1 5V, with load resistance of about 1 k Q *. To prevent built-in fuse F1 inside the instrument from burning out

due to over-load, it is forbidden to measure the battery or power supply beyond the rated range.

*. The measuring time for battery voltage should be as short as possible

since there will be built-in analog load power consumption which may shorten the service life of battery.

Figure 11

Figure 12

Figure 13

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UT 139A/B/C OPERATING MANUAL

11. Other functions:

*. After 2s of full display following startup, enter the normal measurement mode. “ErrE” will be displayed in

case of any fault to the internal EEPROM.

*. Auto power-off: the instrument will be “automatically powered off” to save energy in case of no operation

to the knob switch within 15min. Under auto power-off statuts, any press on the SELECT of UT139Aor any button of UT139B/C will “automatically arouse” the instrument, or restart the instrument by turning the knob switch to OFF. Under power-off status, press on SELECT and power on, the buzzer will make five sounds to remind that the auto power-off function has been cancelled. Restarting the instrument after power-off will recover the auto power-off function.

*. Buzzer: A “Beep” sound (about 0.25s) from buzzer means the function button is valid when pressing any

button or turning the function button. When measuring voltage or current: AC and DC voltage > about 600V mA gear AC/DC current >190mA(UT139A), 390mA(UT139B), 590mA(UT139C)When A gear AC/DC current is >10A, buzzer will make continuous sounds to remain the over-range. In addition, the buzzer make make 5 continuous sounds about 1 min prior to auto power-off and then make one long sound prior to power-off.

When the auto power-off function is cancelled, 5 sounds will be made by the buzzer every 15min.

*. Low-voltage detection: it is used to detect the internal VDD. When the voltage is lower than 2.4V, the battery

under-voltage symbol will be displayed, and the normal operation is available; while when lower than 2.2V, no operation is allowed and only the symbol is displayed after startup.

* When the battery supply voltage is reduced to 2.6V, the LCD backlight is weak or can not start; measurement

functions can still be used normally.

UT 139A/B/C OPERATING MANUAL

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X. Technical Index

Accuracy: ± (a% reading +b word number), one year of guarantee period. Ambient temperature: 23°C +5°C (73 .4 T + 9 T ) Relative humidity: <75%.

1. DC voltag e measurement

Range

Resolution

Accuracy

UT139A UT139B

UT139C

20.00mV* 40.00mV*

60.00mV*

10|jV

± (0.5 % + 2 )

200.0mV** 400.0mV**

600.0mV**

0.1 mV

2.000V

4.000V

6.000V 1mV ± (0.7 % + 3 )

20.00V 40.00V

60.00V

10mV

200.0V 400.0V

600.0V

0.1V

600V 600V

600V

10MQ. (There w ill be unstable d igital display in case of */** range open-circuit; after connecting with

the load, it can be controlled £ ±1)

* Range: 20mV range fo r UT 139A,

40mV range for UT 139B, 60mV range fo r UT 139C.

* Range: 200mV range for UT 139A

400mV range for UT 139B 600mV range for UT 139C.

Maximum input voltage: ±600V

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UT 139A/B/C OPERATING MANUAL

2. AC voltage measurement

Range Accuracy

Resolution

UT139A UT139B

UT139C

UT139A

UT139B/C

20.00mV 40.00mV 60.00mV

+ (1 .0%+3)

+ (1.0% + 3 )

10pV

200.OmV 400.OmV 600.OmV 0.1 mV

2.000V 4.000V 6.000V ± (0 .8% + 3)

1 mV

20.00V 40.00V 60.00V 10mV

200.0V 400.0V 600.0V 0.1V

600V 600V 600V

± (1.2% + 3) ± (1.0% + 3) 1V

V.F.C 20 0.0V-600V 0.1/1V

± (4.0%+3)

A Input impedance: about 10MQ.

Display the true RMS. Frequency response: UT139A 45~400Hz, UT139B/C 45~1 kHz.(VFC: 45~400Hz)

Assurance of accuracy:5~100% range, an allowance of <10 words of residual reading for short-circuit.

It will be up to 3.0 when AC crest factor reaches full value (with except for 600V range, which is up to 1.5 when

the range reaches the full value). Maximum input voltage: 600Vrms

3. Resistance measurement

Range Accuracy

Resolution

UT139A UT139B

UT139C UT139A UT139B/C

200.0Q* 400.0Q* 600.00*

+ (1 .0%+2)

+ (1.0% + 2 )

0.10

2.000kQ 4.000k0 6.000k0 + (0.8% + 2 )

20.00kQ 40.00k0 60.00k0 100

200.OkO 400.OkO 600.OkO 1000

2.000MQ 4 .OOOMO 6.OOOMO

+ (1.2% + 3 )

1kO

20.00MQ 4Q.OOMO 6Q.OOMO + (1.2% + 3 )

+ (1.5% + 5 )

10k0

UT 139A/B/C OPERATING MANUAL

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A Range: measured value = displayed value - short-circuit value of test pen.

*. Open-circuit: about *1V *. Overload protection: 600V-PTC

4. •*)) Circuit on-off, -H-diode measurement

Range

Resolution Remark

•» )

0.10

Circuit breakage resistance value is set as: > 150 Q, buzzer is soundless. Good conductivity is set as: ^10 Q buzzer sounds.

-w -

1 mV

Open circuit voltage is about 2.1 V(UT139A), 3.2V(UT139B/C) Normal voltage value of silicon PN junction is about 0.5~0.8V.

A Overload protection: 600V-PTC

5. Capacitance Measurement (Only applicable for UT139B/C)

Range

Resolution

Accuracy

9.999nF

1 pF

Under REL status: ±(4%+10)

99.99nF~999.9|jF

10pF~0.1 |JF ±(4%+5)

9.999mF~99.99mF

1 |jF~10mF + 10%(^2m F)

Overload protection: 600V-PTC

For capacitor ^1 pF, it is recommended to adopt REL measurement mode to ensure measurement accuracy.

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UT 139A/B/C OPERATING MANUAL

6. Frequency/duty ratio measurement (only applicable for UT139B/C)

Range

Resolution

Accuracy

9.999Hz—9.999MHz

0.001 Hz-0.001 MHz

±(0.1%+4)

1%-99.9% 0.1%

Not defined

^ Over-load protection: 600V-PTC

Input range a: (DC level is zero) ^100 kHz:100mVrms^a^20Vrms >1 00kHz-1MHz : 200mVrms^a^20Vrm s >1 MHz : 500mVrms^a^20V rms

5MHz—10MHz : 900mVrm s^a^20Vrms Duty ratio %: only applicable for measurement ^ 100kHz Remark:

*. During measurement of AC voltage or AC current, if need to read online frequency value or duty ratio,

following input should be met: frequency response: ^1 kHz;

*. AC voltage: mV range input ^100mV; V range input ^ range *6% *. AC current: input range a

4000/6000|jA, 4007600mA, 10A range: a ^ range *6%

400/600|jA, 40/60mA, 4/6A range: a ^ range *60%

7. Temperature measurement (only applicable for UT139C)

Range

Resolution

Accuracy

°C

-40—1000°C

1°C

+ 3

>0 -100°C

±(1.0%+3)

>100-1000°C

±(2.0%+3)

-40—1832°F

-40—32°F 1°F

±5

>32—212°F

± (1.5%+5)

>2 12—1832°F

± (2.5%+5)

UT 139A/B/C OPERATING MANUAL

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^ Over-load protection: 600V-PTC Remark: The point type K (Ni-Cr and Ni- Si) thermocouple is only applicable for the measurement of temperature under 230°C/446°F

8. DC current measurement

Range

Accuracy

Resolution

UT139A UT139B

UT139C

UT139A UT139B/C

200.0mA 400.0mA 600.0mA

± (0.7%+2)

0.1 mA

2000mA 4000mA 6000mA

1mA

20.00mA 40.00mA 60.00mA

10mA

200.0mA

400.0mA 600.0mA

0.1mA

2.000A 4.000A 6.000A ± (1.0%+3)

± (1.0%+3)

1mA

10.00A 10.00A 10.00A

10mA

Over-load protection:

u A mA range: F1 fuse: (cp6x32)mm FF0.2A H 600V (CE) UT139A FF0.5A H 600V (CE) UT139B FF0.6A H 600V (CE) UT139C 10 A range: F2 fuse: (cp6x25)mm F 10A H 600V (CE)

9. AC current measurement

Range

Resolution

Accuracy

UT139A UT139B UT139C

u A

200.0mA 400.0mA 600.0mA 0.1 mA 2000mA 4000mA 6000mA 1mA

±(1.0+3)

20.00mA 40.00mA 60.00mA

10mA

200.0mA 400.0mA 600.0mA 0.1mA

2.000A 4.000A 6.000A 1mA ±(1.2%+3)

10.00A 10.00A 10.00A 10mA

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UT 139A/B/C OPERATING MANUAL

Frequency response: UT139A 45~400Hz, UT139B/C 4 5 - 1kHz Display: true RMS. Assurance of accuracy: 5—100% range, an allowance of <2 words of residual reading for short-circuit.

It will be up to 3.0 when AC crest factor reaches full value.

A Over-load protection: (the same as the DC current over-load protection)

10. (60A) current clamp measurement (only applicable for UT139C)

Range

Resolution

Accuracy

60A dc

0.01A

±(1.0+3)

60A ac

±(1.2+3)

Over-load protection: 600V-PTC

11. Batter capacity measurement (only applicable for UT139A)

Range

Resolution Load current

Accuracy

1.500V 1mV *30mA ±5%

9.00V 10mV

*10mA

A Over-load protection: F1 fuse: (cp6x32)mm FF0.2A H 600V (CE)

UT 139A/B/C OPERATING MANUAL

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XI. Upkeep and Maintenance

A Warning: Power shall be switched off before opening the rear cover of the instrument; and the test pen

shall be away from the input terminal and circuit to be measured.

1. Conventional upkeep and maintenance

* For upkeep and maintenance, wet cloth and mild cleanser rather than abrasive or solution shall be used to

clean the meter housing. * Please stop using and send for maintenance in case of any abnormal condition about the instrument. * The inspection or maintenance for instrument, if necessary, shall be performed by the qualified professional

maintenance personnel or designated maintenance department.

2. Battery or fuse tube replacement (See Figure 14)

Built-in battery shall be replaced in time when LCD displays the under-voltage prompt “ C2 ”, otherwise

measurement accuracy may be affected.

Battery specification: AA 1.5Vx2

Operating steps:

1. Set the power switch at “Off”, take the test pen away from the input jack and remove the protective sleeve.

2. Screw off one screw securing batter rear cover with screw driver, remove the cover and replace: The under-voltage used battery and burnout fuse: Flfuse: ((p6*32) mm FF0.2A H 600V (CE)(UT139A)

FF0.5A H 600V (CE)(UT139B) FF0.6A H 600V (CE) (UT139C)

3. Screw off the second screw securing the rear cover with screw

driver and remove the cover to replace the burnout F2 fuse (<p6x25) mm F 10A H 600V (CE). Figure 14

I1 IKII -T

H I H I ■

UT 139A/B/C OPERATING MANUAL

The User Manual is subject to modification without further notice.

UT139A/B/C OPERATING MANUAL

UNI-T

Manufacturer: Uni-Trend Technology(C hina) Limited No 6, Gong Ye Bei 1st Road Songshan Lake National High-Tech Industrial Development Zone, Dongguan City Guangdong Province China Postal Code:523 808

Headquarters: Uni-Trend Group Limited Rm901, 9/F, Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon, Hong Kong Tel: (852) 2950 9168 Fax: (852) 2950 9303 Email: info@uni-trend.com http://www.uni-trend.com

UNI-T TU13BA, TU13BC, TU13BB Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual