UNI-T UT55 - User Manual

Introduction
Digital Multimeter UT50 series (hereafter
referred to as "the Meter") are 2000-count
hand-held instruments featuring stable
performance, versatile functions, high degree
of reliability&accuracy. They are designed
with large-scale integrated circuits, dual
integral A/D converter as well as overloaded
protection. The series can measure AC/DC
voltage, AC/DC current, resistance,
capacitance, frequency, temperature, diode
and continuity, making the series a perfect
tool for users.
Your Meter's Features
z 32 ranges.
z Liquid Crystal Display, digits height is 27mm.
z Overload display l.
z Maximum display 1999 (3 1/2 digit).
z Full range overload protection.
z Auto-Power Off (For UT53, UT54 and UT55
ONLY).
z Temperature:
Operating:0
o
C to 40
o
C (32
0
F to 104
0
F).
Storing:-10
o
C to 50
o
C (14
0
F to 122
0
F ).
z Altitude:
Operating: 2000m
Storing: 10000m.
z Relative Humidity:Max. relative humidity
80% for temperature up to 31
o
C decreasing
linearly to 50% relative humidity at 40
o
C.
z Low Battery display "" .
z Strap for easy carry.
z Tilt stand design, three observation angles,
is in favor of reading display.
z Dimension: 190mm x 88mm x 34mm.
z Weight: Meter only(excluding test leads)
about 270g .Meter + holster + tilt stand
about 550g.
z Battery Type: 9V NEDA 1604 or 6F22 or 006P
Specifications
Accuracy is specified for one year after calibration,
at operating temperatures 23
o
C +/- 5
o
C, with relative
humidity at < 75%.Accuracy specifications take
the form of:+/- (a% readings +digits )
Direct Current Voltage (DC Voltage)
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Overload protection: 250VDC or AC RMS for
200mV range. 750VRMS or 1000Vp-p for other
ranges.
Alternating Current Voltage (AC Voltage)
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Frequency: 40Hz-400Hz .
Overload protection: 250VDC or AC RMS for
200mV range. 750VRMS or 1000Vp-p for other
ranges.
Display: Average Value (RMS of Sine Wave).
200mV
2V
20V
200V
1000V
100μV
1mV
10mV
100mV
1V
Range Resolution
(0.5% +1)
UT51 UT 52 UT53 UT54 UT55
Accuracy
(0.8% +2)
200mV
2V
20V
200V
750V
100μV
1mV
10mV
100mV
1V
Range Resolution
UT51 UT 52 UT53 UT54 UT55
Accuracy
(1.2% +3)
(0.8% +3)
(1.2% +3)
Direct Current Current (DC Current)
20μA
200
μA
2mA
20mA
200mA
2A
10A
20A
0.01
μA
0.1
μA
1
μA
10
μA
100
μA
1mA
Range Resolution
UT51 UT 52 UT53 UT54 UT55
Accuracy
(2%+5)
(0.8%+1)
(1.5%+1 )
(0.8%+1)
10mA
(1.5%+1)
(2%+5)
(2%+5 )
Overload protection:
For UT51:
2A, 250V fast acting fuse, φ5x20mm(below
2A range)
10A, 250V fast acting fuse,φ5x20mm(at 10A
range) .
For UT52/53/54/55:
315mA, 250V fast acting fuse, φ5x20mm (No
fuse at 20A range).
Max current input :
For UT51: 10A (The measurement time for high
current should be less than 10 seconds, and
the interval time between two measurements
should be greater than 15 minutes.
For UT52/53/54/55: 20A (The measurement
time for high current should be less than 15
seconds, and the interval time between two
measurements should be greater than 15
minutes.
Alternating Current Current (AC Current)
200μA
2mA
20mA
200mA
2A
10A
20A
0.1
μA
1
μA
10
μA
100
μA
1mA
Range
Resolution
UT51 UT 52 UT53 UT54 UT55
Accuracy
(1%+3)
(1%+3)
10mA
(1.8%+3)
(3%+7)
(3%+7 )
(1.8%+3)
(1.8%+3)
Overload protection:
For UT51:
2A, 250V fast acting fuse, φ5x20mm(below 2A
range)
10A, 250V fast acting fuse,φ5x20mm(at 10A range) .
For UT52/53/54/55:
315mA, 250V fast acting fuse,φ5x20mm (No fuse
at 20A range).
Max current input :
For UT51: 10A (The measurement time for high
current should be less than 10 seconds, and the
interval time between two measurements should be
greater than 15 minutes.
For UT52/53/54/55: 20A (The measurement time
for high current should be less than 15 seconds, and
the interval time between two measurements should
be greater than 15 minutes.
Measuring voltage drop:
200mV for full ranges.
Display: Average Value (RMS of Sine Wave ) .
Capacitance
Testing signal: around 400Hz 40mVrms
Range Resolution
UT51 UT 52 UT53 UT54 UT55
Accuracy
(4% +3)
2nF
20nF
200nF
2
μF
20
μF
1pF
10pF
100pF
1nF
10nF
Resistance
200Ω
2KΩ
20KΩ
200KΩ
2MΩ
20MΩ
200MΩ
0.1Ω
1Ω
10Ω
100Ω
1KΩ
10KΩ
100KΩ
Range Resolution
UT51 UT 52 UT53 UT54 UT55
Accuracy
(0.8% +1)
(0.8% +3)
(1% +2)
[5%(-10) +10]
Frequency
Range Resolution
UT51
Accuracy
UT52 UT54
UT55
UT53
2kHz
20kHz
1Hz
10Hz
(2%+5)
(1.5%+5)
Voltage at open circuit: 700mV (200MΩ range,
open circuit voltage around 3V) .
Overload protection: 250VDC or AC RMS for all
ranges.
Caution: At 200M
Ω range, as test lead is short
circuit the LCD normally display 10 digits is normal,
deduct
the 10 digits from the measured reading
during
measuring.
Unpacking Inspection
Safety Information
Unpack the carton and take out the Meter. Check
the following accessories for any missing or
damaged component. Please contact your
dealership immediately if any missing or
damaged component is found.
UT50 Series are designed and manufactured in
compliance with: IEC61010, CATⅠ1000V, CAT
Ⅱ600V and CATⅢ300V, Double Insulation and
Pollution Degree.
Operating Manual------1pc
Test Leads --------------1 pair
WRN-01B Thermocouple----1set
(For UT53,UT55 Only)
Holster (Optional)
Warnings
Use the meter as specified in the manual,
otherwise the protection offered by the Meter
may be impaired.
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it may cause electric shock.
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insulation or broken wires.
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terminals and ensure good contact between
them.
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the Meter, otherwise it may cause electric
shock or damage to the Meter.
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model or similar electrical specifications.
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voltage above 1000V between COM and
grounding.
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above 60VDC or 30VAC RMS.
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batteries as soon as
" " appears.
ƔShut off the power timely after the measurements
complete. Take out the batteries if not used for
a long time.
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temperature, high moisture. The performance
of the Meter may be compromised if
moisture-affected.
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injury, do not alter internal wiring randomly.
Caution
about 2.8V
about 2.8V

Summary

Introduction and Safety

Unpacking Inspection

Check accessories for missing or damaged components upon receiving the meter.

Safety Information

Guidelines to prevent electric shock, damage, and ensure safe operation.

Meter Features

Highlights key features like 32 ranges, LCD display, and auto-power off.

Specifications Overview

Voltage and Current Specifications

Details accuracy, range, resolution, and overload protection for DC/AC voltage and current.

Resistance, Capacitance, and Frequency

Details specifications for resistance, capacitance, and frequency measurements.

Specialized Measurements

Details specifications for temperature, diode, continuity, and transistor hFE tests.

Making Measurements

DC Voltage Measurement Procedure

Connect leads, set range, and measure DC voltage with safety cautions.

AC Voltage Measurement Procedure

Connect leads, set range, and measure AC voltage with safety cautions.

DC Current Measurement Procedure

Connect leads in series, set range, and measure DC current with safety cautions.

AC Current Measurement Procedure

Connect leads in series, set range, and measure AC current with safety cautions.

Advanced Measurement Functions

Resistance Measurement Procedure

Connect leads, set range, and measure resistance with safety cautions.

Capacitance Measurement Procedure

Connect capacitor, set range, and measure capacitance with safety cautions.

Frequency Measurement Procedure

Connect leads, set range, and measure frequency.

Temperature Measurement Procedure

Connect probe, set range, and measure temperature.

Diode and Continuity Test

Connect leads, set function, and perform diode/continuity tests.

Transistor hFE Test

Connect transistor to jack, set range, and measure hFE.

Maintenance and Safety Precautions

Auto-Power Off Function

Details the meter's auto-power off feature for energy saving.

General Service and Maintenance

Guidelines for general service, avoiding overloads, and proper operation.

Replacing the Battery

Procedure and cautions for safely replacing the meter's battery.

Replacing the Fuses

Procedure and cautions for safely replacing the meter's fuses.

Using the Holster and Strap

Instructions on how to use the meter's holster and carrying strap.

UNI-T UT55 Specifications

General

Brand	UNI-T
Model	UT55
Category	Multimeter
Language	English