Uni-Trend UT4000 Series User manual

File : UTG-005
Date : March 20, 2009
Draft : 1
This product conforms with safety product design requirements of UL and CE standards.
UT4000 Series
Digital Storage Oscilloscope
User Manual

Introduction
Dear valued user,
Thank you for purchasing a Uni-Trend instrument. To use your new product correctly,
read this User Manual carefully and completely before operation and pay particular
attention to “Safety Instructions”.
Please keep this User Manual in a safe place after reading it carefully. For easy reference
during future operation, we recommend putting it alongside your Uni-Trend product or in
an easily accessible place.

UNI-T®
UT4000 User Manual
Copyright Information
zUni-Trend Technology (Dongguan) Limited. All rights reserved.
zProducts of the Company are protected by patents granted and pending in the
People’s Republic of China or other countries.
zThe Company reserves the right to change product specifications and prices.
Uni-T all rights reserved. All licensed software products are properties of Uni-Trend
Technology (Dongguan) Limited and its subsidiaries or software providers. They are
protected by the national copyright law and international conventions. Information
contained in this manual supercedes all information in previously published versions.
Uni-T is the registered trademark of Uni-Trend Technology (Dongguan) Limited.

UNI-T®UT4000 User Manual
If this product is sold or assigned by the original purchaser to a third party within three
years of purchase, the new owner should note that warranty is available for a period of
three years from the day the original purchaser acquired the product from Uni-T or an
authorized dealer. The probe, other accessories and fuses are not covered by warranty.
If any genuine defect is found during the valid warranty period, Uni-T has the option to
repair the defective product without any charge for parts or labor, or replace it with
another product (to be decided by Uni-T). For warranty purposes, Uni-T may use parts,
modules and replacement products that are brand new or repaired to a good-as-new
standard. All old parts, modules and products that are removed during replacement
become properties of Uni-T.
In this User Manual, “customer” means an individual or entity vested with the rights
hereunder. To enjoy the warranty service, the “customer” must report any defect to Uni-T
during the valid warranty period and make appropriate arrangement to allow servicing.
The customer should pack the defective product in a container and deliver it to a
maintenance centre specified by Uni-T. The customer should also prepay all freight cost
and provide a copy of the original sales receipt issued to the original purchaser. If the
product is to be delivered to an address within the country where the maintenance centre
operates, Uni-T shall pay the cost of returning the product to the customer. If the product
is to be delivered any other destination, all freight, custom duty, tax and other costs will
be paid by the customer.
This warranty does not apply to any defect, malfunction or damage caused by accident,
normal wear and tear of mechanical parts, any form of application other than the stated
ones, improper use, improper maintenance or poor maintenance. Under the warranty
terms and conditions, Uni-T has no obligation to provide the following services :
a) Repairing any damage arising from installation, repair or maintenance carried out by
a non Uni-T service representative;
b) Repairing any damage arising from improper use or connection to incompatible
equipment;
c) Repairing any damage or malfunction arising from using a power source not
provided by Uni-T;
d) Servicing a product that has been modified or integrated with other products (such
modification or integration makes repair more time consuming and difficult).
This warranty is made available to this product specifically and supercedes all other
previous warranties, whether express or implied. Uni-T and its dealers will not make any
implied guarantee on the salability or suitability of this product for any specific purpose.
In the event of breach of warranty terms and conditions, repair or replacement of
defective product shall be the only and all remedial measure offered by Uni-T.
Notwithstanding any prior notification of potential damage that is indirect, special,
consequential or inevitable, Uni-T and its dealers shall bear no liability for any such
damage.

UNI-T®
UT4000 User Manual
General Safety Rules
This unit is designed and manufactured strictly in accordance with GB4793 safety
requirements for electronic testing meters and IEC61010-1 safety standards. It fully meets
CAT II 600V insulation and overvoltage requirements and Grade II anti-pollution safety
standards. To prevent personal injuries and damage of this unit or any other devices
connected to it, please take note of the following safety precautions. To avoid potential
hazards, use this unit strictly as instructed by this User Manual.
Maintenance should only be carried out by a trained professional.
To avoid fire and personal injury :
Use a correct power cable : Use only the specified power cable which is authorized in
the country of use.
Remove the plug correctly : Do not remove the probe or testing cable when they are
connected to power.
Ensure good grounding : This unit is grounded by the ground wire of the power cable.
To avoid electric shock, the grounding conductor must touch the ground. Before
connecting the input or output terminal, ensure the unit is properly grounded.
Connect the probe of the digital storage oscilloscope : The probe ground cable is the
same as ground potential. Do not connect the ground cable to high voltage.
Check the rated values of all terminals : To prevent fire and excessive current shock,
please check all rated values and label data. Read the manual carefully and check the
rated values before connecting the unit.
Do not operate the unit with the chassis cover open : Do not operate this unit when the
outer cover or front panel is open.
Use suitable fuses : Only use specified fuse types and rated specifications.
Avoid exposing circuitry : When power is on, never make contact with exposed adaptor
or components.
When fault is suspected, stop operation : If you suspect a fault, ask a qualified
maintenance professional to carry out inspection.
Maintain good ventilation.
Do not operate in humid condition.

UNI-T®UT4000 User Manual
Do not operate in combustible and explosive conditions.
Keep the product surface clean and dry.
Safety Messages and Symbols
Safety terminology used in this manual. The following messages may appear in this
manual :
Warning : Warning statements identify conditions or practices that could result in
injury or loss of life.
Caution : Caution statements identify conditions or practices that could result in
damage to this unit or other properties.
Messages on the product : The following messages may appear on the product :
“Danger” means potential damage that is immediate.
“Warning” means potential damage that is not immediate.
“Caution” means possible damage to this product or other properties.
Symbols on the product : The following symbols may appear on the product :
High voltage Caution! Refer to manual Protective ground terminal
Ground terminal for chassis Ground terminal for testing

UNI-T®
UT4000 User Manual
Preface
This manual provides information on the operation of the UT4000 digital storage
oscilloscope series. Guidance is given in several chapters as follows :
Chapter 1 ⎯User Guide : Simple guide to oscilloscope functions and installation.
Chapter 2 ⎯Instrument Setups : Guide to operation of the UT4000 digital storage
oscilloscope series.
Chapter 3 ⎯Practical Illustrations : Example illustrations are provided to solve
various testing problems.
Chapter 4 ⎯System Prompts and Trouble-shooting :
Chapter 5 ⎯Servicing and Support :
Chapter 6 ⎯Appendixes :
AppendixA : Technical Indicators
Appendix B :Accessories for UT4000 Oscilloscopes
Appendix C : Maintenance and Cleaning

UNI-T®UT4000 User Manual
UT4000 Introduction
UT4000 oscilloscopes offer user-friendliness, outstanding technical indicators and a host
of advanced features. They are your perfect tools to complete testing tasks swiftly and
efficiently. This manual is a user guide for 7 models of this digital storage oscilloscope
series :
Model Bandwidth Single Channel
Sampling Rate
Dual Channel
Sampling Rate
Equivalent
Sampling Rate
UT4042C 40MHz 2GS/s 1GS/s ⎯
UT4062C 60MHz 2GS/s 1GS/s ⎯
UT4082C 80MHz 2GS/s 1GS/s ⎯
UT4102C 100MHz 2GS/s 1GS/s ⎯
UT4152C 150MHz 2GS/s 1GS/s 50GS/s
UT4202C 200MHz 2GS/s 1GS/s 50GS/s
UT4302C 300MHz 2GS/s 1GS/s 50GS/s

UNI-T®
UT4000 User Manual
UT4000 oscilloscopes offer a user-friendly front panel with clear indications to allows
access to all basic functions for easy operation. The scaling and position buttons for all
channels are optimally arranged for direct view operation. As design is based on the
controls of traditional instruments, users can use the new units without spending
considerable time in learning and familiarizing with operation. For faster adjustment to
ease testing, there is an [AUTO] key to instantly display the appropriate waveform and
range position.
The performance features listed below will explain why UT4000 series can fully satisfy
your testing and measurement requirements :
z2GS/c real-time sampling rate (dual channel 1GS/s, single channel 2GS/s) and
50GS/s equivalent sampling rate (UT4152C/UT4202C/UT4302C)
zDual time base function; unrivaled waveform detail observation and analysis
capabilities
z6k storage depth; 60M equivalent storage depth; 1024k recording length
z16-channel logic analyzer; 3½ digital multimeter
zUnique envelop sampling feature with direct visual display of carrier wave details
after amplitude modulation
zQuick waveform acquisition and colour change function that visually describes the
strength of waveform
zScroll display in scan mode for continuous monitoring of signal variations
zHD colour LCD system at 320 x 240 pixel aspect ratio
zUnique XY mode that displays the waveform and Lissajous figure concurrently
zUSB drive system software upgrade
zSupports plug-and-play USB storage devices and capable of communicating with a
computer through the USB storage device
zAutomatic waveform and status configuration
zStorage of waveforms, setup and bit map; waveforms and setups reproduction
zAutomatic measurement of 27 waveform parameters; parameters testing and
customization
zAutomatic cursor tracing measurement
zUnique wave recording and replay function
zBuilt-in FFT
zMultiple waveform mathematics functions (including add, subtract, multiply and
divide)
zEdge, video, pulse width, slew rate and alternate trigger functions
zVisual system help messages
UT4000 accessories :
z2 x 1.5m, 1:1/10:1 probe. For details refer to the probe instructions. These
accessories conform with EN61010-031: 2002 standards
zPower line conforming to international standards applicable in the country of use
zUser Manual
zProduct Warranty Card
zUSB connecting cable : UT-D04
zUT4000 communication control software (USB-DEVICE)
z2 x multimeter pen; 2 x current-to-voltage converter module; UT-M03/UT-M04
zUT4000 logic analyzer probe (including clamps and cable, flex cable) : UT-P06

UNI-T®UT4000 User Manual
Table of Contents
Item Page
General Safety Rules
Preface
Chapter 1 User Guide 1
General Inspection 5
Functional Check 5
Probe Compensation 8
Automatic Setups for Waveform Display 8
Getting to Know the Vertical System 9
Getting to Know the Horizontal System 10
Getting to Know the Trigger System 12
Chapter 2 Instrument Setups 14
Setting Up the Vertical System 15
Setting Up the Horizontal System 24
Setting Up the Trigger System 27
Setting Up the Sampling System 34
Setting Up the Display System 37
Storage and Recall 39
Setting Up Utility Functions 41
Automatic Measurement 44
Cursor Measurement 47
Using the Run Button 48
Logic Analyzer (LA) Measurement 49
Multimeter Measurement 51
Chapter 3 Practical Example Illustrations 54

UNI-T®
UT4000 User Manual
Item Page
Illustration 1 : Measuring simple signals 52
Illustration 2 : Observing the delay caused by a
sine wave signal passes through the circuit
53
Illustration 3 : Acquiring single signals 54
Illustration 4 : Reducing random noise of signals 55
Illustration 5 : Using cursors for measurement 56
Illustration 6 : Using the X-Y function 57
Illustration 7 : Video signal triggering 59
Illustration 8 : Pass/fail check 61
Illustration 9 : Quick acquisition 62
Illustration 10: Using the dual time base function 62
Illustration 11: Using the Logic Anaylzer 63
Illustration 12: Using the multimeter 64
Chapter 4 System Prompts and Trouble-shooting 65
Definitions of System Prompts 65
Troubleshooting 65
Chapter 5 Service and Support 67
Warranty 67
Using the USB Upgrade Program 67
Contact Us 74
Chapter 6 Technical Indicators 75
Appendix A : Technical indicators 75
Appendix B : Accessories for UT4000 Oscilloscopes 81
Appendix C : Maintenance and Cleaning 81
Index 83

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UNI-T®UT4000 User Manual
Chapter 1 ⎯User Guide
UT4000 Series digital storage oscilloscopes are small and compact portable devices. The
user-friendly front panel enables easy operation for basic testing and measuring tasks.
This chapter provides notes on the following :
UGeneral inspection
UFunctional check
UProbe compensation
UAutomatic setups for waveform display
UGetting to know the vertical system
UGetting to know the horizontal system
UGetting to know the trigger system
When beginning to use your UT4000 oscilloscope, first familiarize yourself with the
operation front panel. This chapter briefly describes the operation and functions of the
front panel, so you can get started with your UT4000 series digital storage oscilloscope as
quickly as possible.
Your UT4000 oscilloscope comes with a front panel with at-a-glance functions for easy
operation. There are buttons and function keys on the front panel. The functions of knobs
are similar to other oscilloscopes. The row of 5 keys on the right of the display panel are
menu operation keys (designated as [F1] to [F5] from top down). With these keys you can
set up different options of the current menu. The other keys are function keys. You can
use them to enter different function menus or access particular functions directly.

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UNI-T®
UT4000 User Manual
Figure 1-1 Front panel of UT4000 Oscilloscopes

3
UNI-T®UT4000 User Manual
Figure 1-2 Schematic diagram for operating the UT4000 front panel

4
UNI-T®
UT4000 User Manual
Figure 1-3 Schematic diagram for the display interface

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UNI-T®UT4000 User Manual
General Inspection
We suggest checking your new UT4000 oscilloscope in the following steps.
1. Check the unit for possible shipping damages
If the package carton or foam plastic protective lining is seriously damaged, do not
discard until you have carried out an electrical and mechanical check and found the
product and accessories performing satisfactorily.
2. Check the accessories
A checklist of accessories that come with your UT4000 oscilloscope is provided in the
section “UT4000 Accessories” of this user manual. Please check for any missing items
against this list.
If any item is missing or damaged, please contact your UNI-T dealer or our local office.
3. Thorough inspection of the entire unit
If the exterior of the unit is damaged, or it is not operating normally, or it fails to pass the
performance test, please contact your UNI-T dealer or our local office.
Functional Check
Carry out a quick functional check in the following steps to make sure your oscilloscope
is operating normally.
1. Power on the unit
Power on the unit. Power supply voltage is 100-240V AC, 45-440Hz. After connecting to
power, start the self calibration process by pressing the [UTILITY] button (utility
function) once and [F1] twice. Then press [SELECT] to run.
To go to the next page press [UTILITY], [F1], THEN [F5]. To run the factory default
setup, press[F1] then [SELECT], as shown in Figure 1-4.
When the above procedure is complete, press [CH1] to enter the CH1 menu.

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UNI-T®
UT4000 User Manual
Figure 1-4
Warning : To avoid danger, ensure the digital storage oscilloscope is safely grounded.
2. Accessing signals
Your UT4000 oscilloscope has dual input channels and one external trigger input channel.
Please access signals in the following steps :
cConnect the probe of the digital storage oscilloscope to the CH1 input, and set the
attenuation switch of the probe to 10X (Figure 1-5).
Figure 1-5 Setting the attenuation switch
UTILITY button
Power ON/OFF button

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UNI-T®UT4000 User Manual
dYou have to set the probe attenuation factor of the oscilloscope. This factor changes the
vertical range multiple to ensure the measurement result correctly reflects the amplitude
of the signal being tested. Set the attenuation factor of the probe as follows : Press [F4]
then [F2] to display 10X on the menu.
Figure 1-6 Setting the probe deflection factor of the oscilloscope
eConnect the probe tip and ground clamp to the corresponding probe compensation
signal terminals. Press [AUTO] and you will see a square wave in the display (about 3V
peak-to-peak at 1kHz) in a few seconds, as shown in Figure 1-7.
4Repeat these steps to check CH2. Press the [OFF] function button to close CH1, then
press [CH2] function button to open CH2. Repeat steps 2 and 3.
Figure 1-7 Probe compensation signal
Probe ration

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UNI-T®
UT4000 User Manual
Probe Compensation
When connecting the probe to any input channel for the first time, perform this
adjustment to match the probe to the channel. Skipping the compensation calibration step
will result in measurement error or fault. Please adjust probe compensation as follows :
1. In the CH1 menu set the probe to 10X. Move the switch on the probe to 10X and
connect the probe to CH1. Connect the probe tip to the probe compensator’s signal
output connector, then connect the ground clamp to the ground wire connector of
the probe compensator. Display CH1 and press [AUTO].
2. Observe the shape of the displayed waveform.
Overcompensation Correct Compensation Undercompensation
Figure 1-8 Probe compensation calibration
3. If you see an “Undercompensation” or “Overcompensation” waveform display,
adjust the adjustable tab inside the adjustment hole at the tip of the probe with the
adjusting rod in the probe accessory pack, until a “Correct Compensation”
waveform shown in Figure 1-8 is displayed.
Warning : To avoid electric shock when measuring high voltage with the probe,
ensure the probe’s insulation lead is in good condition. Do not touch the metal part
of the probe when connected to HV power.
Automatic Setups for Waveform Display
Your UT4000 oscilloscope features an autoset function. It can automatically adjust the
vertical deflection factor, scanning time base and trigger mode based on the input signal,
until the most appropriate waveform is displayed. The autoset function can only be
operated when the signal to be measured is 50Hz or above and the duty ratio is larger than
1%.
Using theAutoset Function :
1. Connect the signal to be tested to the signal input channel.
2. Press [AUTO]. The oscilloscope will automatically set the vertical deflection factor,
scanning time base and trigger mode. Should you require to make more detailed
check, you can adjust manually after the autoset process until you get the optimal
waveform display.

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UNI-T®UT4000 User Manual
Getting to Know the Vertical System
As shown in the figure below, there are a series of buttons and knobs in the vertical
control zone. The following steps will get you familiar with the use of these controls.
Figure 1-9 Vertical controls
1. Turn the vertical position knob [POSITION] to enable the waveform to display the
signal in the centre of the window. The vertical position knob controls the vertical
display position of the signal. When you turn the vertical position knob, the sign
indicating vertical reference of the [GROUND] channel will move up and down with
the waveform.
Measurement Tips
If the channel coupling is DC, you can test the signal’s DC% quickly
b
y checking
the difference between the waveform and signal ground.
In the case of AC coupling, the DC% within the signal will be intercepted. In this
coupling mode you can display the AC% of the signal with higher sensitivity.
Shortcut key for resetting the vertical
p
osition of the dual analo
g
channel to
zero [SET TO ZERO]
This shortcut key can reset vertical shift, horizontal shift and holdoff to the zero
position (center point).