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UNI-T
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ut81a
Operating Manual
52 pgs1.6 Mb0
Operating Manual
55 pgs1.07 Mb0

UNI-T UT81B, UT81A Operating Manual

Model UT81B
OPERATING MANUAL
Chapter Title Page
6 6 7 8 8 10 11 11 12 13 15 15 15 17 19 19 20 20 22 27 29 31 33
1
Table of Contents
1 Before You Start
Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols
2 Using The Testing Tool
Reading the screen The Meter Structure Functional Buttons
3 Making Measurements
A. Scope Mode i. Setting up the Sleep Mode, Contrast, Beep ii. ACV, DCV, Hz, ACV and DCA Range iii. Trigger function iv. Waveform data save and recall B. Digital Multimeter Mode i. Measuring Voltages ii. Measuring Currents iii. Measuring Resistance iv. Testing Diodes v. Testing for Continuity vi. Measuring Frequency / Duty Cycle
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35 37 38 38 39 40 41 41 42 43 43 44 44 45 45 46 46 47 48 49 49 50
Chapter Title Page
Table of Contents
A. B. C. D. E. F. G.
DC Voltage AC Voltage DC Current AC Current Resistance Diode Test Continuity Test
vii. Measuring Capacitance
4 Using Software 5 Maintenance The Test Tool
A. General Service B. Replacing the Fuses C. Replacing the Battery
6 Specifications
Safety and Compliances Physical Specifications General Specifications (Digital Multimeter) General Specifications (Scope) Feature Summary Basic Specifications (Digital Multimeter) Basic Specifications (Scope) Detailed Accuracy Specifications
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50 51
Chapter Title Page
Table of Contents
H. Frequency and Duty Cycle % I. Capacitance
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7 10 11 13
Table Title Page
List of Tables
1-1 Unpacking Inspection 1-2 International Electrical Symbols 2-1 Reading the Screen 2-2 Functional Buttons
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12 13 17 21 23 24 25 27 29 31 33 35 39 40
Figure Title Page
List of Tables
2-1 Meter Structure 2-2 Functional Buttons 3-1 Waveform Display 3-2 Voltages Measurement 3-3 µA Range Measurement 3-4 mA Range Measurement 3-5 10A Range Measurement 3-6 Resistance Measurement 3-7 Diode Test 3-8 Continuity Test 3-9 Frequency / Duty Cycle Measurement 3-10 Capacitance Measurement 5-1 Fuse Replacement 5-2 Battery Replacement
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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.
Scope Digital Multimeter UT81B (hereafter referred to as “the Meter”) is a 3999 counts and 3 3/4 digits adopting digital control techique with both waveform and multimeter all in one.
Scope mode is a complete intelligent measurement system including signal input, sampling, data process, auto search and waveform save and recall. It has
Chapter 1
Before You Start
bandwidth 8MHz, real-time sample rate 40MS/s with peak rate sampling process can catch up pulse industrial signal. It can measure AC/DC engine, transducer, circuit, control, UPS and industrial equipments. It is an ideal tools in professional repairing industries.
Digital Multimeter mode can measure AC voltage and current, DC voltage and current, Resistance, Capacitance, Frequency, Duty Cycle, Diodes and Continuity.
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Item Description Qty
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:
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 USB interface cable CD-ROM (Installation Guide & Computer Interface Software) Test Lead Alligator Clip Power Adaptor
1.5V Batteries (R6) Scope Probe (available at extra cost) BNC probe (available at extra cost)
1 piece 1 piece 1 piece 1 pair 1 piece 1 piece 4 pieces 1 piece 1 piece
Table 1-1. Unpacking Inspection
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Safety Information
This Meter complies with the standards IEC61010 safety measurement requirement: in pollution degree 2, overvoltage category (CAT. II 1000V, CAT.III 600V) and double insulation.
CAT.II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient overvoltages than CAT. III CAT. III: Distribution level, fixed installation, with smaller transient overvoltage than CAT. IV
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.
Warning
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International electrical symbols used on the Meter and in this Operating Manual are explained on page 10.
Rules For Safe Operation
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 1000V rms between any terminal and grounding to avoid electric
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shock or damages to the Meter. 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. When the Meter working at an effective voltage over 60V in DC or 42V 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. 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
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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 us e 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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International Electrical Symbols
AC or DC DC Measurement AC Measurement Continuity Test Diode Grounding Double Insulated Warning. Refer to the Operating Manual Deficiency of Built-In Battery Conforms to Standards of European Union
Symbols used on the Meter and in this manual are explained in Table1-2.
Table 1-2. International Electrical Symbols
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Chapter 2
Using the T esting Tool
Reading the Screen
Description
The degree of contrast Sleep mode time Display backlight Beeper on and off Confirm Increase Decrease Waveform moves up Waveform moves down Increase a range
The screen displays the menu that provides the following choices available:
Table 2-1. Reading the Screen
Description
Decrease a range Increase a time base Decrease a time base Waveform moves right Waveform moves left Trigger moves up Trigger moves down Trigger slope adjustment Auto trigger mode Normal trigger mode Single trigger mode
Display
Contrast Auto Off BK Light BEEP ENTER
MOVE MOVE RANG
Display
RANG BASE BASE BASE > BASE < TRIG TRIG SLOP AUTO NORM SHOT
Table 2-1. Reading the Screen
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Figure 2-1. Meter Structure
The Meter Structure
The Figure 2-1 shows the Meter structure.
1. USB Terminals
2. LCD Display
3. Functional Buttons
4. Rotary Switch
5. Power adaptor Input Terminals
6. 10A Input Terminal
7. mAµA Input Terminals
8. COM Input Terminal
9. Other Input Terminals
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Figure 2-2. Functional Buttons
Table 2-2. Functional Buttons
Description
Software functional buttons, details please refer to the below. Under scope mode, Press Range button to switch between DC and AC measurement Under scope mode, press Time button to set the X-axis of time base. Under scope mode, press Trig button to change the trigger mode. In multimeter mode: Press Auto button to enter autoranging mode when measuring resistance, voltage and current. This button is invalid when measuring capacitance, diode, continuity buzzer and capacitance. In scope mode: Press Auto button to set the amplitude and time base to auto.
Buttons F1, F2, F3 and F4 Range
Time
Trig
Auto
Functional Buttons
The buttons activate features that augment the function selected with the rotary switch. The buttons are shown in Table 2-2.
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Table 2-2. Functional Buttons
Buttons
Mode
Set
Save/Call
Hold
Description
To switch between waveform display (scope mode) and digital reading (multimeter mode). This button is only valid when under voltage, frequency, currents mode. Press Set button to set the auto power off, backlight, contrast and beep Under scope mode, press Save/Cal to store and recall data. Press Hold button to enter or exit hold mode.
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Chapter 3
Making Measurement
Introduction
Chapter 3 explains how to make measurements. You could turn the Meter off by turning to OFF position
or set up the sleep mode from 1-30 minutes. Please must ensure the Meter is not under sleep mode if you turn the Meter on but without display.
To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as
soon as the battery indicator “
” appears.
A. Scope Mode
l The LCD top right part display: RUN, HLD, REV l The LCD top right corner has battery icon to indicate
when the battery is lower than 5V. l Under scope mode, both reading and waveform will be displayed.
Based on the working environment to set up sleep mode, contrast, beep Press Set button to set the auto power off, display backlight, contrast and beep Auto off Bk Light Contrast Beep F1 F2 F3 F4
F1: Set auto power off time Auto off 15 ENTER F1 F2 F3 F4 The time level is from OFF, 1 to 30 minutes. Press F4 to confirm, save and return. Press functional button to exit and the setting remains unchanged.
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F2: Set the Display Backlight BK Light 15 ENTER F1 F2 F3 F4
The brightness level from 0 to 31. Press F4 to confirm, save and return. Press functional buttons to exit, the setting is kept, but will not save. The setting will be lost after power off.
F3: Set the LCD contrast
Contrast 15 ENTER
F1 F2 F3 F4
The contrast level from 0 to 31. Press F4 to confirm, save and return. Press functional buttons to exit, the setting is kept, but will not save. The setting will be lost after power off.
F4: Set the beeps features, it can only be used under
resistance, diode and continuity measurement.
Beep ON OFF ENTER F1 F2 F3 F4
F2 : to turn the beep on F3 : to turn the beep off F4 : to confirm , save and return
Press functional buttons to exit, the setting is kept, but
will not save. The setting will be lost after power off.
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