UNI-T TU13BA, TU13BC, TU13BB Operating Manual
UT139A/B/C
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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
UNI-T
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
a
Low electricity of internal battery
•»)
Buzzing On-off
-H-
Diode
AC/DC
A
Warning
HHh
Battery to be measured
_L
Grounding
&
Current clamp
m
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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UNI-T
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
1
Data hold prompt
2 —
Negative reading
3 AC/DC
AC/DC measurement prompt
4 MAX-MIN
Maximum/Minimum/Maximum-Minimum value measurement prompt
5
• a
Under-voltage internal battery
6
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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7
-H
Diode measurement prompt
8
•»)
Circuit on-off measurement prompt
9
A
Relative measurement prompt
10
Q /kQ /M Q
Resistance units: Ohm, Kilohm and Megohm
11
Hz/kHz/MHZ
requency units: Hz, kHz, MHz
12
%
Duty ratio measurement unit
13 mV/V
Voltage units: mV, V
14
|jA /m A /A
Current units: |jA, mA, A
15
nF/M F/m F
Capacitance units: nF, u F, mF
16
°C
Centigrade temperature unit
17
°F
Fahrenheit temperature unit
18
(EF)NCV
Non-contact AC voltage sensing
19
d>
Auto power-off prompt
20
£
Current clamp
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