UNI-T UT71A, UT71C, UT71D, UT71E, UT71B Operating Manual
P/N:110401103779
Model UT71A/B/C/D/E
OPERATING MANUAL
CHAPTER TITLE PAGE
Model UT71A/B/C/D/E: OPERATING MANUAL
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TABLE OF CONTENTS
1.
2.
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15
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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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3.
4.
CHAPTER TITLE PAGE
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
J. Power Measurement
Using Stores, Recall and Send Features
Introduction
Storing and Clearing Readings
Recalling Stored Readings
Using Send
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5.
6.
7.
CHAPTER TITLE PAGE
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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
D. AC Current
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CHAPTER TITLE PAGE
E. Resistance
F. Continuity Test
G. Diode Test
H. Capacitance
I. Frequency
J. Temperature Degrees Celsius Fahrenheit
K. 4~20mA loop current
L. Power Measurement
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Model UT71A/B/C/D/E: 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; Digital Multimeter UT71C/D/E (hereafter referred to as "the Meter") is a 40000 counts and 4 3/4 digits
with steady operations, fashionable structure and auto ranging instrument. They all not only can measure AC voltage
and current, DC voltage and current, Resistance, Capacitance, Temperature, Frequency, Diodes, Continuity , 4~20mA
Loop, Max/Min, Relative Mode but also has Data Store, Data Recall, AC True RMS, AC+DC,Low Battery Display,
Double Display Backlight, Data Hold, Automatic Power Off and full overload protection.
UT71B/C/D/E has extra Temperature, 4~20mA Loop, Data Store and Data Recall feature; UT71E has extra Power
Measurement feature.
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Model UT71A/B/C/D/E: 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
10
English Operating Manual
Test Lead
K-Type (nickel chromium ~ nickel silicon) Point Contact Temperature Probe (It is
only suitable for measuring temperature under 230 oC
Alligator Clip
Test Clip
USB interface cable
CD-ROM (Installation Guide & Computer Interface Software)
Carrying Bag
Power Adaptor (UT71E only)
9V Battery (NEDA 1604, 6F22, 006P)
1 piece
1 pair
1 piece
1 piece
1 pair
1 piece
1 piece
1 piece
1 piece
1 piece
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Model UT71A/B/C/D/E: 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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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 highvoltage 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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Model UT71A/B/C/D/E: OPERATING MANUAL
International Electrical Symbols
Symbols used on the Meter and in this manual are explained in Table1-2.
Table 1-2. International Electrical Symbols
AC or DC
DC Measurement
AC Measurement
Grounding
Double Insulated
Warning. Refer to the Operating Manual
Deficiency of Built-In Battery
Conforms to Standards of European Union
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Model UT71A/B/C/D/E: OPERATING MANUAL
Chapter 2
Getting Acquainted
Turning the Meter On
To turn the Meter on, turn the rotary switch from OFF
to any switch setting.
Battery Considerations
The Meter uses one 9V Battery (NEDA 1604, 6F22,
006P). The following paragraphs describe several
techniques used to conserve battery power.
Automatic Power Off
The display blanks and the Meter goes into a "sleep"
mode if you have not changed the rotary switch position
or pressed a button for a set period. While in Sleep
mode, pressing the blue button or turning the rotary
switch could turn the Meter on. The Meter then returns
to the display for the function selected with the rotary
switch; all previously activated button features are
discarded.
Automatic Backlight Off
Press LIGHT button to turn the backlight on and press
LIGHT again to turn it off. Press EXIT to exit the feature.
Press LIGHT to select the backlight level (low or high).
In Setup menu (see Chapter 5), you could specify a
time to automatically turn off the backlight (10 seconds,
20 seconds, 30 seconds or OFF). If the period is set
to OFF, the backlight feature is disabled.
The automatic power off is preset to 10 minutes. From
the Setup menu (see Chapter 5), you could specify a
time (10 minutes, 20 minutes, 30 minutes or OFF). If
you set to OFF, the Meter retains on until you turn the
rotary switch to OFF or the battery becomes too weak.
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Model UT71A/B/C/D/E: OPERATING MANUAL
Low Battery Indication
A constant battery icon ( ) in the upper left corner of
the display notifies you that the batteries are low and
should be replaced.
Warning
To avoid false readings, which could lead to possible
electric shock or personal injury, replace the battery as
soon as the battery icon ( ) appears.
The Meter Structure
The Figure 2-1 shows the Meter structure.
1. LCD Display
2. Functional Buttons
3. Rotary Switch
4. Input Terminals
Figure 2-1. Meter Structure
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Model UT71A/B/C/D/E: OPERATING MANUAL
Rotary Switch
Turn the Meter on by selecting any measurement function. The Meter presents a standard display for that function.
The display may also be influenced by some of the choices made in Setup.
Use the blue button to select any rotary switch alternate function (labeled in blue letters).
When you turn the rotary switch from one function to another, a display for the new function appears. Button choices
made in one function do not carry over into another function.
The Table 2-1 described each rotary switch position
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Model UT71A/B/C/D/E: OPERATING MANUAL
Table 2-1. Rotary Switch Selections
Rotary
Switch Position
Rotary Switch Function Blue Key Function
Turn the Meter off
DC voltage measurement
AC voltage measurement
AC or DC voltage measurement
DC millivoltage measurement
DC millivoltage measurement
Resistance measurement
Power measurement
Capacitance measurement
Centigrade temperature measurement
None
None
None
Toggle between AC or DC voltage measurement
Frequency measurement
Frequency signal duty cycle measurement
None
Diode test
Continuity test
None
None
Fahrenheit temperature measurement
OFF
V
Hz %
mV
ºC ºF
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(UT71B/C/D)
W (UT71E only)
(UT71B/C/D )
(UT71A/B/C/D )
(UT71A/B/C/D )
(UT71E only)
(UT71A/E)
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Model UT71A/B/C/D/E: OPERATING MANUAL
Rotary
Switch Position
Rotary Switch Function Blue Key Function
Centigrade temperature measurement
AC or DC current measurement (400µA ,4000µA)
AC or DC current measurement (40mA ,400mA)
AC or DC current measurement (10A)
Fahrenheit temperature measurement
Frequency measurement
Frequency signal duty cycle measurement
Toggle between AC or DC current
Toggle between AC or DC current
4~20mA loop current as % reading
Toggle between AC or DC current
mA
µA
A
(4~20mA)
%
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(UT71E only)
∫C ∫F
Hz %
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Model UT71A/B/C/D/E: OPERATING MANUAL
Functional Buttons
The buttons activate features that augment the function selected with the rotary switch. The buttons are shown
in Table 2-2.
STORE
RECALL
Press the button once to access the main feature (e.g. STORE).
To access the first additional feature of the button (e.g. RECALL), press and hold the button for over 1 second to
access this additional feature. This additional feature appears right above or on the left hand side of the appropriate
keys.
To access the second additional feature of the button (e.g. ), press once the button again while the Meter has
already entered the first additional feature (e.g. RECALL). The second additional feature appears on the right hand
side above the appropriate keys.
The RANGE and EXIT buttons has only one additional feature.
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Model UT71A/B/C/D/E: OPERATING MANUAL
Table 2-2. Functional Buttons
Button Description Access Method
RANGE
SETUP
STORE
RECALL
Press the button once.
Press and hold the button while
turning on the Meter
Press and hold the button for more
than 1 second
Press the button
once.
Range feature:
Exit AUTO and enter MANUAL ranging. In MANUAL, select
next input range. EXIT to return to AUT O. AUTO is default.
Testing resistance signal from calibrator:
When testing resistance signal from calibrator, it is necessary
to press this button to change the maximum display to 4000
counts but the accuracy remains unchanged.
Setup feature:
Access Setup selections, the display shows "SET".
In the Setup mode, each press of SETUP button steps to
the next Selection
Store feature:
Store the current measurement value. Press EXIT to exit
the Store feature.
Model UT71A/B/C/D/E: OPERATING MANUAL
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Table 2-2. Functional Buttons
Button Description Access Method
Press and hold the button for over 1
second
Press the button
once after entering Setup mode.
Press the button once.
Press and hold the button for over 1
second.
Press the button once after entering
Setup or Recall or Store mode.
Recall feature:
Recall the stored value. Press EXIT to exit the Recall feature.
Setup feature:
In Setup, press to select OFF at the selection of HIGH and
LOW
Hold feature:
Press HOLD to freeze the displayed value. Press EXIT to
release the display.
Peak Hold feature:
Press to access Peak Hold feature, the primary display
shows PEAK HOLD. Press EXIT to exit.
In Setup, each press to select the digit you want to edit.
In Recall, press to enable SEND feature
In Store, press to toggle between clearing all the stored
reading or start storing reading from the current index number.
STORE
RECALL
HOLD
Peak HOLD
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Table 2-2. Functional Buttons
Button Description Access Method
Press the button once.
Press and hold the button for over 1
second.
Press the button once.
Press and hold
the button for over 1 second.
Press the button once after entering
SEND mode.
Press to exit certain button functions and the Meter will return
to the factory default setting.
Press to turn the backlight on. It is possible to toggle between
1st and the 2nd backlight level and Exit the feature by pressing
this button. After exiting the light feature, it is necessary to press
and hold the button for over 1 second to turn the backlight on
again.
Press to display max, min and average values.
Press EXIT to stop and return to current measurement mode.
Press to output the data, AUTO mode switch off. The primary
display shows "SEND".
Press EXIT to exit.
In Setup, each press to decrement an Option.
In Recall, each press to go back to the previous stored reading.
EXIT
LIGHT
MAXMIN
SEND
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Model UT71A/B/C/D/E: OPERATING MANUAL
Press the button once.
Press and hold the button for over 1
second.
In Store, each press to decrease a second on the storing
interval.
Press EXIT to exit
Press to enter relative mode, the primary display shows .
The left secondary display shows the present measurement
value. The right secondary display shows the stored value.
The primary display shows the present measurement value
minus the stored value.
Press EXIT to exit relative mode.
In Setup, each press to increment an Option.
In Recall, each press to recall the next stored reading.
In Store, each press to increase a second on the storing interval.
Table 2-2. Functional Buttons
Button Description Access Method
MAXMIN
SEND
REL
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SEND
Press the button once.Press to output the data, AUTO mode switch off. The
primary display shows "SEND".
Press EXIT to exit.
(UT71A only)
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