Unit UT71A Manuale utente
Model UT71A/B
OPERATING MANUAL
CHAPTER TITLE PAGE
Model UT71A/B: OPERATING MANUAL
1
TABLE OF CONTENTS
1.
2.
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5
6
7
7
9
10
10
10
10
10
11
11
12
14
21
24
24
Before You Start
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
Getting Acquainted
Turning the Meter On
Battery Considerations
Automatic Power Off
Automatic Backlight Off
Low Battery Indication
The Meter Structure
Rotary Switch
Functional Buttons
The Meter Functions Vs Displays
Selecting the Range
Understanding the Display
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Model UT71A/B: OPERATING MANUAL
3.
4.
CHAPTER TITLE PAGE
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29
30
30
30
32
34
35
37
39
41
43
44
45
45
45
46
46
Analogue Bar Graph
Using MAX MIN
Making Measurements
Introduction
A. Measuring Voltages
B. Measuring Currents
C. Measuring Resistance
D. Testing for Continuity
E. Testing Diodes
F. Measuring Capacitance
G. Measuring Frequency / Duty Cycle
H. Measuring Temperature
I. 4~20mA loop current as % readout
Using Stores, Recall and Send Features
Introduction
Storing and Clearing Readings
Recalling Stored Readings
Using Send
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Model UT71A/B: OPERATING MANUAL
5.
6.
7.
CHAPTER TITLE PAGE
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50
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51
52
53
53
54
55
56
57
58
58
59
61
Changing the Default Setting
Introduction
Selecting Setup Options
Maintenance
A. General Service
B. Replacing the Fuses
C. Replacing the Battery
Specifications
Safety and Compliances
Physical Specifications
General Specifications
Feature Summary
Basic Specifications
Detailed Accuracy Specifications
A. DC Voltage
B. AC Voltage
C. DC Current
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Model UT71A/B: OPERATING MANUAL
CHAPTER TITLE PAGE
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64
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D. AC Current
E. Resistance
F. Continuity Test
G. Diode Test
H. Capacitance
I. Frequency
J. Temperature
Degrees Celsius
Fahrenheit
K. 4~20mA loop current
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Model UT71A/B: OPERATING MANUAL
Chapter 1
Before You Start
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 UT71A/B (hereafter referred to as “the Meter”) is a 20000 counts and 4 1/2 digits with steady
operations, fashionable structure and auto ranging instrument. They all not only can measureAC voltage and current,
DC voltage and current, Resistance, Capacitance, Frequency, Diodes, Continuity, Relative Mode but also has AC
True RMS, AC+DC, Low Battery Display, Double Display Backlight, Data Hold,Automatic Power Off and full overload
protection.
UT71B has extra Temperature, 4~20mA Loop, Data Store and Data Recall feature.
6
Model UT71A/B: OPERATING MANUAL
Unpacking Inspection
Open the package case and take out the Meter. Check the items shown on Table 1-1 carefully to see any missing
or damaged part:
Table 1-1. Unpacking Inspection
Item Description Qty
In the event you find any missing or damage, please contact your dealer immediately.
1
2
3
4
5
6
7
8
9
English Operating Manual
Test Lead
K-Type (nickel chromium ~ nickel silicon) Point Contact Temperature Probe (It is
only suitable for measuring temperature under 230ºC (UT71B only)
Alligator Clip
Test Clip
USB interface cable
CD-ROM (Installation Guide & Computer Interface Software)
Carrying Bag
9V Battery (NEDA 1604, 6F22, 006P)
1 piece
1 pair
1 piece
1 piece
1 pair
1 piece
1 piece
1 piece
1 piece
7
Model UT71A/B: OPERATING MANUAL
Safety Information
This Meter complies with the standards IEC61010 safety
measurement requirement: in pollution degree 2,
overvoltage category (CAT. III 1000V, CAT.IV 600V)
and double insulation.
CAT. III: Distribution level, fixed installation, with smaller
transient overvoltage than CAT. IV
CAT.IV: Primary supply level, overhead lines, cable
systems etc.
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 may 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 9.
Rules For Safe Operation
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.
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.
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Model UT71A/B: OPERATING MANUAL
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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.
If the value to be measured is unknown, use the
maximum measurement position.
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, diodes.
Before measuring current, check the Meter’s fuses
and turn off power to the circuit before connecting
the Meter to the circuit.
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.
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.
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