YUSHI YUT-2820 User manual

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Contents
CONTENTS ....................................................................................................................................................... I
CHAPTER 1 A BRIEF INTRODUCTION TO YUT-2820............................................................................1
1.1 NAMES OF THE MAJOR COMPONENTS OF THE INSTRUMENT.....................................................................1
1.2 KEYPAD ...................................................................................................................................................1
1.3 DISPLAY SCREEN .....................................................................................................................................2
1.4 BASIC OPERATION OF THE INSTRUMENT ..................................................................................................2
1.4.1 Power Supply...............................................................................................................................................2
1.4.2 Probe Connection.........................................................................................................................................3
1.4.3 Switching On and Off the Instrument...........................................................................................................3
1.4.4 Restore the Initial Parameters of the Instrument ..........................................................................................3
1.5 MAIN MENU AND FUNCTIONS..................................................................................................................3
1.5.1 Functional Keys .........................................................................................................................................3
1.5.2 Main Menu .................................................................................................................................................4
CHAPTER 2 FUNCTIONS, FEATURES, AND PARAMETERS OF THE INSTRUMENT.....................4
2.1 BASIC FUNCTIONS OF THE INSTRUMENT...................................................................................................4
2.2 FEATURES OF THE INSTRUMENT ...............................................................................................................5
2.3 SPECIFICATIONS.......................................................................................................................................6
CHAPTER 3 DETAILED OPERATION INSTRUCTIONS ........................................................................7
3.1 PARAMETER MENU FUNCTIONS ...............................................................................................................7
3.1.1 Sound Path ...................................................................................................................................................7
3.1.2 Sound Velocity.............................................................................................................................................7
3.1.3 Displacement................................................................................................................................................8
3.1.4 Gain..............................................................................................................................................................8
3.1.5 Compensation...............................................................................................................................................8
3.1.6 Scale.............................................................................................................................................................8
3.1.7 Reject...........................................................................................................................................................9
3.1.8 Wave Height Readings.................................................................................................................................9
3.2 SETTING MENU........................................................................................................................................9
3.2.1 Waveform Filling.......................................................................................................................................10
3.2.2 Color Scheme.............................................................................................................................................10
3.2.3 Language....................................................................................................................................................10
3.2.4 Lighting......................................................................................................................................................10
3.2.5 Alarming....................................................................................................................................................10
3.2.6 Automatic Wave Height .............................................................................................................................11
3.2.7 Date............................................................................................................................................................11
3.2.8 Time...........................................................................................................................................................11
3.2.9 Parameter Resetting ...................................................................................................................................11
3.3 SQUARED WAVE MENU ...........................................................................................................................12

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3.3.1 Pulse energy...............................................................................................................................................12
3.3.2 Pulse width.................................................................................................................................................12
3.3.3 Damping.....................................................................................................................................................12
3.3.4 Broadband..................................................................................................................................................13
3.3.5 Repeating frequency...................................................................................................................................13
3.4 GATE MENU..............................................................................................................................................13
3.4.1 Gate A menu...............................................................................................................................................14
3.4.1.1 Starting of gate A ....................................................................................................................................14
3.4.1.2 Width of gate A .......................................................................................................................................14
3.4.1.3 Height of gate A......................................................................................................................................14
3.4.1.4 Mode of gate A........................................................................................................................................14
3.4.1.5 Display choice.........................................................................................................................................15
3.4.2 Gate B menu .............................................................................................................................................15
3.4.2.1 Starting of gate B ....................................................................................................................................15
3.4.2.2 Width of gate B .......................................................................................................................................16
3.4.2.3 Height of gate B ......................................................................................................................................16
3.4.2.4 Mode of gate B........................................................................................................................................16
3.4.2.5 Measuring point ......................................................................................................................................16
3.5 PROBE MENU..........................................................................................................................................17
3.5.1 Dual probes................................................................................................................................................17
3.5.2 Probe zero ..................................................................................................................................................17
3.5.3 Probe K value.............................................................................................................................................17
3.5.4 Front distance.............................................................................................................................................18
3.5.5 Work piece thickness..................................................................................................................................18
3.5.6 Probe type ..................................................................................................................................................18
3.5.7 Probe frequency .........................................................................................................................................19
3.5.8 Probe diameter ...........................................................................................................................................19
3.6 DAC MENU ...........................................................................................................................................19
3.6.1 DAC echo...................................................................................................................................................19
3.6.2 Gate A start.................................................................................................................................................20
3.6.3 Distance compensation...............................................................................................................................20
3.6.4 DAC curve mode .......................................................................................................................................20
3.6.5 RL..............................................................................................................................................................20
3.6.6 SL...............................................................................................................................................................21
3.6.7 EL ..............................................................................................................................................................21
3.7 AVG MENU..............................................................................................................................................21
3.7.1 AVG mode..................................................................................................................................................21
3.7.2 Gate Astart .................................................................................................................................................21
3.7.3 Sensitivity ..................................................................................................................................................21
3.7.4 AVG curve..................................................................................................................................................22
3.7.5 φvalue calculation.....................................................................................................................................22
3.8 MEMORY MENU..................................................................................................................................................22
3.8.1 Memory number.........................................................................................................................................22
3.8.2 Call-out ......................................................................................................................................................22

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3.8.3 Storage .......................................................................................................................................................23
3.8.4 Deletion......................................................................................................................................................23
3.8.5 Communication..........................................................................................................................................23
3.9 OPERATION OF OTHER SPECIAL FUNCTIONAL KEYS................................................................................23
3.9.1 Automatic gain...........................................................................................................................................23
3.9.2 Freezing......................................................................................................................................................24
3.9.3 Wave peak memory....................................................................................................................................24
3.9.4 Full screen..................................................................................................................................................25
CHAPTER 4 APPLICATION OF TESTING............................................................................................25
4.1 CALIBRATION METHOD AND STEPS OF THE INSTRUMENT ......................................................................25
4.2 ZERO CALIBRATION OF THE STRAIGHT BEAM PROBE.............................................................................25
4.2.1 Calibration Procedures...............................................................................................................................26
4.2.2 Operation Steps..........................................................................................................................................26
4.2.3 Measurement of the Sound Velocity of the Material ..................................................................................27
4.3 CALIBRATION OF THE ANGLE BEAM PROBE...........................................................................................28
4.3.1 Calibration Procedures...............................................................................................................................28
4.3.2 Operation Steps..........................................................................................................................................28
4.4 MAKING OF DAC CURVE..........................................................................................................................31
4.5 MAKING OF AVG CURVE ..........................................................................................................................32
CHAPTER 5 SKILLS OF USING THE INSTRUMENT............................................................................33
5.1 FLEXIBLE USAGE OF THE GATE..............................................................................................................34
5.2 MAKING THE BEST OF THE PROMPTING MESSAGES ON THE SCREEN DRUING THE OPERATION PROCESS...34
5.3 SAVING AND CALLING THE INSTRUMENT STATUS AND THE DETECTION PARAMETERS .............................34
5.4 USING BATTERIES TO REDUCE INTERFERENCE........................................................................................34
5.5 SWITCHING THE DISPLAY MODES ...........................................................................................................35
5.6 PEAK VALUE MEMORY FUNCTION...........................................................................................................35
CHAPTER 6 APPLICATION AND PRACTICE OF FLAW DECTETION .............................................36
6.1 APPLICATION ON STEEL PLATE FLAW DETECTION ...................................................................................36
6.1.1 The adjustment of testing scope.................................................................................................................36
6.1.2 The adjustment of sensitivity .....................................................................................................................36
6.1.3 the identification of flaws...........................................................................................................................37
6.1.4 Flaw Evaluation .........................................................................................................................................37
6.1.5 Flaw Quantify ............................................................................................................................................37
6.1.6 The identification of the defect location.....................................................................................................38
6.2 THE APPLICATION ON THE WELDING LINE FLAW DETECTION......................................................................38
6.2.1 Operating steps...........................................................................................................................................39
6.2.2 Measurement of the flaw length.................................................................................................................39
CHAPTER 7 MAINTENANCE AND REPAIRING....................................................................................40
7.1 OPERATORS’TRAINING..........................................................................................................................40
7.2 INSTRUMENT MAINTENANCE..................................................................................................................40
7.3 ENVIRONMENT REQUIREMENTS .............................................................................................................40

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7.4 MAINTENANCE OF RECHARGEABLE BATTERY...........................................................................................41
7.5 BATTERIES REPLACEMENT........................................................................................................................41
7.6 REPAIRING................................................................................................................................................42
CHAPTER 8 COMMUNICATION BETWEEN THE INSTRUMENT AND THE COMPUTER.........42
8.1 THE COMMUNICATION BETWEEN YUT-2820AND THE COMPUTER AND THE USE OF DATA PROCESSING
SOFTWARE....................................................................................................................................42
8.2 MAIN FUNCTIONS ....................................................................................................................................43
APPENDIX I FLAW DETECTION REPORTS..........................................................................................44
APPENDIX II TERMINOLOGY..................................................................................................................45

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Chapter 1 A Brief Introduction to YUT-2820
1.1 Names of the Major Components of the Instrument
Figure 1-1
1.2 Keypad
The keypad plays a role of mediator in the dialogue between human and machine. The keypad is
printed in Chinese and the layout of the keypad is shown in Figure 1-2. All the control instructions given
by the user to the flaw detector are finished entirely by the keypad. With the process of the keypad
operation, the instrument is able to identify various meanings of each key according to different
conditions and then to carry out the instructions of the operator. The detailed usage of each key will be
introduced respectively in the following chapters.
1. TFT True Color Display
2. Touch Keypad
3. D Ring
4. Hand Strap
5. Rotatable Stand
6. Power Adapter Port
7. Communication Port
8. T/R Probe Cable Port
9. R Probe Cable Port
The names of the major components of the instrument
are shown in Figure 1-1.
Figure 1-2

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1.3 Display Screen
Press to power the instrument on (the probe is not connected), and the screen is shown as
Figure 1-3.
1.4 Basic Operation of the Instrument
During the operation of the instrument, directly press the corresponding menu key, and the relevant
menu will be displayed on the screen. There are 6 main menus in YUT-2820; and each main menu
consists of several sub-menus, which can be switched through up and down keys among the operation
pages. The selected menu is highlighted; and its value can be adjusted through left and right keys.
1.4.1 Power Supply
Using AC Adapter
Alternating current can be used to power YUT-2820 through an AC adapter. Plug the power output
terminal of the AC adapter into the socket on the YUT-2820. Pay attention to alignment of the red
spots on the socket when connecting the charger and the main unit. Otherwise, the instrument
doesn't work.
Using Batteries
A pack of exclusive rechargeable built-in batteries can be used in YUT-2820, as shown in Figure
1-4.
Figure 1-3
Figure 1-4

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1.4.2 Probe Connection
When you use YUT-2820, we recommend using our stock probe connecting cable with the
appropriate probes. Various types of our standard stock probes can be used directly.
The probe should be plugged into the socket upside the instrument. When it is the mode of single
probe, the probe cable should be connected to T/R socket; when it is the mode of dual probe (one for
transmitting, the other for receiving), you should plug the transmitting probe into the T/R socket and the
receiving probe into the R socket. If these factors are not paid attention to, unfavorable results might be
loss or disordered echo waveform.
1.4.3 Switching On and Off the Instrument
Press to directly start up YUT-2820 and activate the standby mode. After the detection and
data storage, press to shut down the instrument.
1.4.4 Restore the Initial Parameters of the Instrument
If the instrument crashes or some functions are in disorder or the parameters of the instrument need
resetting, press twice then press (up) key or (do) key to select the submenu resetting
parameters. Then press (left) key or (right) key to adjust the parameters. When the screen
displays resetting parameters confirmation, press Ok to restore the parameters.
Note: after the instrument is initialized, all the parameters are reset to the factory defaults.
1.5 Main Menu and Functions
1.5.1 Functional Keys
Automatic gain
Increase or decrease the highest wave inside the gate to 80% of the
screen
Freezing
Waveform freezing
Wave Peak Memory
Automatically store the highest wave
Full screen
Full screen display
On/off
Switch on and off
Menu control keys
Up, down, left, right,
Ok
Up/down keys are used to switch among options, left/right keys are
used to adjust values.

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1.5.2Main Menu
Main
Menu
Submenu
Functions
Basic
Gain, Compensation, Sound Velocity, Sound Path,
Displacement, Scale, Reject, Wave Height Readings
Basic Parameters in
Detection
Setting
Waveform Filling, Color Scheme, Language, Alarm, Automatic
Wave Height, Date, Time, Parameter Resetting,
Basic Functions of the
Instrument
Gate
Gate A Start, Gate A Width, Gate A Height, Gate A Mode,
Display Mode, Gate B Start, Gate B Width, Gate B Height,
Gate B Mode, Measurement Point
Relevant Options
Setting Gate
Probe
Dual Probes, Probe Zero, Probe K Value, Front Edge Length,
Work Piece Thickness, Probe type, Probe frequency, Probe
diameter
Relevant Options
Setting Probe
Curve
DAC Echo, Gate A Start Position, TVG, Curve mode, RL, SL,
EL; AVG mode, Sensitivity, Aperture, AVG curve, Φvalue
Setting of Making
DAC/AVG Curve
Storage
Memory Number, Call Out, Storage, Deletion, Communication
Setting of Data Storage
Squared
wave
Pulse Energy, Pulse Width, Damping, Broadband, Repeating
Frequency
Match the probe
perfectly
Chapter 2 Functions, features, and parameters of the instrument
2.1 Basic functions of the instrument
Wave peak memory: real time envelopes show the highest wave of the flaws and record the
maximum value of the flaws, it is helpful to position the flaws precisely and scan the work piece quickly.
With the help of envelope waveform, the quality of the flaws can be determined.
Automatic gain: automatically adjust the gain to the preset amplitude height
Alarming function: afferent echo/echo loss alarming
Real-time clock: automatically record and store the date and time of waveforms
Display freezing: catch waveforms and sound path data at any moment, and the gate can be moved
after freezing to measure the echo parameters
Flaw positioning: real-time display sound path S, horizontal X, depth Y, and wave height H
Digital Reject: 0-80%, increase by 1%, unaffecting the linearity and gain
Wave height reading: three display modes, namely relative wave height, dB difference relative to
the gate, and dB difference relative to DAC curve
Data communication: communicate with the computer through RS232 port to transmit waveforms

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and data so as to manage the result of detection on the computer, and generate the flaw detection reports,
as well as print out reports
2 independent measurement gates, monitoring the echo amplitude and the sound path distance
When using transverse wave to detect flaws, the depths of the second and third waves are
automatically calculated according to the slab thickness.
Perfect DAC/AVG curve functions, the curves change along with the changes of the gain, sound
path, and displacement
2.2 Features of the instrument
The firm and durable YUT2820 are specially designed for the hostile site environment. The
pan-seal design which is particular in the nation enables it to defend against dampness, sandstorm, dust,
or pollution caused by all sorts of harsh environments from sea to desert.
Pan-seal design, including tool housing, battery case, fastening screws, and external interface
31 copper screw nuts are inlaid in the hard plastic casing
The innovative rotating positioning stand is convenient
The hand strap can be installed for both hands so that you can hold the machine with your left
or right hand
The probe interface is optional for BNC or Lemo
The D-shaped ring on the instrument is convenient for you to install a cheststrap
The nice surface of the casing is antiskid with eroded textures
Innovative high power lithium batteries of notebook style
Full screen function, the echo display area can cover the entire screen, which provide you with the
sense of the maximum window
Solid waveform display, the visual contrast of waveforms is increased so the undetection is hard to
happen when fast scan is carried out
Bulk storage, up to 1000 data sets can be stored, including waveforms, curves, and parameters
(containing the traditional 1000 channels)
Echo-echo thickness measurement, zero calibration is avoided, and the net thickness of the base
material can be directly measured through the coating
Two operation interfaces are available, i.e., Chinese and English
Easy to use, the user can master the operation method very fast
Squared ultrasonic pulse generator with changeable width and scope is initiative domestically.
It replaces the traditional method of matching probe by changing damping with adjusting the pulse
energy and pulse width. Thus, the probe can be exactly fit for the testing and the resolution and
penetrating power of the approaching surface can be enhanced significantly. It is specially fit for the
testing of large scale of forge piece, casting piece and non-metal with the requirement of higher

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penetrating power and lower electric noise.
●The voltage of the pulse generator can be changed between 50V to 400V continuously, so that
no matter thin plate or hard-penetrated work-piece can be matched with the most fitful probe.
●The width of the pulse can be change d between 25ns to 1000ns continuously, so that the best
sensitivity can be realized with the help of different probes with different frequency.
Damping can be changed among 4 levels: 33/50/100/500Ω, so that the best performance of the
probe can be attained and the different requirements of the sensitivity and resolution can be realized.
Wave signal filter can be changed between 2 levels: 1-4MHz/0.5-15MHz. Each individual
advantage of narrowband and broadband filter can be achieved.
Repeating frequency can be changed freely to avoid unreal signal.
2.3 Specifications
Working frequency: (0.5-15) MHz
Detection coverage: (0-177) inch
Sound Velocity of the Material: (0.039 to 0.394) inch/µs
Operation mode: pulse echo, dual crystal
Pulse displacement: (0-78.7) inch
Probe zero: (0-99.99) µs
Damp: 33/50/100/500Ω
Gain adjustment: (0-110)dB0.1dB1.0dB2.0dB6.0dB Full automatic adjustment of steps
Reject scope: 0-80% adjustable
Vertical linearity error: ≤3%
Horizontal linearity error: ≤0.3%
Resolution: ≥32dB (5P14)
Dynamic range: ≥30dB
Sensitivity allowance: ≥55dB 0.787’’ deep Φ2 Flat-bottom hole)
Data storage: 1000 data sets, including flaw detection status parameters, echoes, DAC curves
Average electric noise and level: ≤10%
Battery types: high power lithium battery
Power supply: 220VAC, 11VDC
Working hours of the batteries: 9 hours.
Casing: pan-seal design of IP67 standard, real waterproof, dampproof, and dustproof.
External dimension: 10.63’’X7.48’’X2.36’’
Weight: 1.4kg without batteries
Working temperature: 14to 122