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GAOTek Ultrasonic Flaw Detector with DAC Curve (Warning Function)
GAOTek Ultrasonic Flaw Detector with DAC Curve (Warning Function)

GAOTek Ultrasonic Flaw Detector with DAC Curve (Warning Function)

ID: GT00XY00YY
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Overview

The GAOTek Ultrasonic Flaw Detector with DAC Curve (Warning Function) is designed to resist the severe environment by warning function in the form of an afferent echo/lost wave alarm. The domestically unique Omni seal design enables to resist the damp, sandstorm, dust, pollution and all sorts of environmental extremes ranging from ocean to desert. This instrument features perfect DAC curve functions which enables the curves to change according to the displacement of the gain and the sound path. Two independent measurement shutters monitor the distance of the echo amplitude and the sound path and on using transverse wave to detect flaws, the depths of the second and third waves are automatically calculated according to the slab thickness. It provides TFT LCD and has the function to adjust the brightness of the true color with many free selections of color schemes.

Key Features

  • Full screen function enables the echo wave displaying area to cover the entire screen
  • Two independent measurement shutters monitor the distances of the echo amplitude and the sound path.
  • Adjustable echo signal and repetition frequency
  • Solid waveform for visual contrast
  • DAC/ AVG curve functions enable the curves to change according to the displacement of the gain and the sound path.
  • Distance Compensation
  • Bulk memory can store up to 1000 data sets
  • No zero calibration
  • Wave crest memory can display the highest wave of the flaw and record the maximum value
  • Automatic gain offers adjustable gain to pre-set amplitude height
  • Warning function in the form of Echo and lost wave alarm
  • Real-time clock which automatically records the date and time of the stored waveform
  • Display freeze
  • Data communication with computer to export and print out reports
  • True color TFT LCD with adjustable brightness

Technical Specifications

Working Frequency 0.5 MHz-15 MHz
Material Sound Velocity 0.039 inch/µs – 0.394 inch/µs (1000 m/s -9999 m/s)
Operation Mode pulse echo, double crystal
Pulse Shift (0 in -7.87 in (0 mm – 200 mm)
Probe Zero 0 us – 199.99 us
Gain control 0 dB -110 dB,0.1 dB, 1.0 dB, 2.0 dB, 6.0 dB, Full automatic adjustment of steps
Vertical Linearity Error ≤ 3 %
Horizontal Linearity Error ≤ 0.3 %
Definition ≥ 32 dB
Dynamic Range ≥ 30 dB
Sensitivity Excess ≥ 55 dB (0.787 in, deep Φ2 Flat-bottom hole)
Average Noise Level ≤1 0 %
Battery Working Hours 8 hours
Power Supply 12 V DC,220 V AC
External Dimension 10.6 in × 7.5 in × 2.4 in (270 mm x 190 mm x 60 mm)
Weight 4.41 lbs. (2 Kg) including batteries

Additional Information

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 adjusts 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 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 monitor 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 curve functions, the curves change along with the changes of the gain, sound path, and displacement
  • True color TFT LCD whose brightness is adjustable, with many color schemes to choose from

Standard Configuration:

  • Ultrasonic flaw detection – 1
  • Recharger -1
  • Probe Line -2
  • Instrument case-1
  • Communication software-1
  • Lithium battery-1
  • Communication cable-1
  • Normal Probe/ Angle beam probe- 1 each
  • Strap -1
  • Quality Certificate
  • User manual
  • Warranty card

Names of the major components of the Instrument

  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

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 this device; 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.

Switching On and Off the Instrument

Press On/OFF key to directly start up the instrument and activate the standby mode. After the detection and data storage, press ON/ OFF Key to shut down the instrument.

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 SETUP twice then press the “Up” key or “Down” 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.

Keypad

The keypad plays a role of mediator in the dialogue between human and machine. The keypad is printed in English. 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.

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.

Main 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, Lighting 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, Φ value Setting of Making

DAC/AVG Curve

Storage Memory Number, Call Out, Storage, Deletion, Communication Setting of Data Storage

Basic Menu Functions

Press   to start the menu.

Sound Path

On the sound path submenu, you can make the adjustment of the display range, i.e., the frequency of the echo displayed.

On the parameter menu, press “Up” or “Down” to select the sound path submenu, then press “Left” (decrease) or “Right” (increase) to adjust the values.

On the sound path submenu, press OK   to adjust the steps. The steps are 1, 10, 25, and 100.

Sound Velocity

On the sound path submenu, you can adjust the velocity of the ultrasonic wave transmitted in the detected work piece. The range of adjustment is from The range of adjustment is from 0.039 inch/µs to 0.394 inch/µs (1000 m/s to 9999 m/s).

On the parameter menu, press “Up” or “Down” to select the sound velocity submenu, then press “Left” (decrease) or “Right” (increase) to adjust the values.

On the sound velocity submenu, press OK  to adjust the steps. The steps are 1, 10, 100 and V-V. When V-V is selected, you can switch between two preset velocities, namely 5920 m/s or 3240 m/s.

Sound velocities of some materials:

Materials Traverse Sound Velocity Longitudinal Sound Velocity Materials Traverse Sound velocity Longitudinal Sound Velocity
Copper 2260 m/s 4700 m/s Organic Glass 1460 m/s 2730 m/s
Aluminum 3080 m/s 6300 m/s Steel 3230 m/s 5920 m/s
Iron 3230 m/s 5900 m/s Epoxy Resin 1100 m/s 2500 m/s

Displacement

The displacement submenu displays the starting point of the screen. When the value is adjusted, the waveform will move horizontally. The adjustment range is from 0 in to 78.74 in (0 mm to 2000 mm).

On the parameter menu, press “Up” or “Down” to select the displacement submenu, then press “Left” (decrease) or “Right” (increase) to adjust the values.

On the displacement submenu, press OK  to adjust the steps. The steps are 1, 10, 25, and 100.

Gain

The gain submenu enables you to adjust the sensitivity of the instrument. Its unit is dB. The higher is the gain, the more sensitive the instrument is, and vice versa. The adjustment range is from 0 dB to 110 dB.

On the parameter menu, press “Up” or “Down” to select the gain submenu, then press

“Left” (decrease) or “Right” (increase) to adjust the values.

On the gain submenu, press Ok  to adjust the steps. The steps are 0.1, 1.0, 2.0 and 6.0.

Compensation

Owing to the different degrees of roughness of surface of the detected object and the test block calibrating the instrument, in the practical detection, you need to increase (or decrease) the sensitivity of instrument to reduce the influence caused by the surface of the detected object. The range of adjustment is from -40 dB to +40 dB. The values used in the adjustment are related to the gain values.

On the parameter menu, press “Up” or “Down” to select the compensation submenu, then press “Left” (decrease) or “Right” (increase) to adjust the values.

On the compensation submenu, press Ok  to adjust the steps. The steps are 0.1, 1.0, 2.0 and 6.0.

Scale

This function enables you to adjust the display mode of the screen coordinate.

On the parameter menu, press to activate the function. Press “Up” or “Down” to select the scale submenu, then press “Left” or “Right” to switch among various display modes.

  • S Sound Path: the actual distance of the sound wave from the surface of the work piece to the flaw.
  • X Horizontal Distance: the horizontal distance of the sound wave from the point of incidence to the flaw.
  • Y Vertical Distance: the vertical distance of the sound wave from the surface of the work piece to the flaw.

Reject

After you adjust to a value, the echo below the value can be cleaned. For instance, you can remove the structural noise of the detected work piece. The reject setting is shown by % on the screen, and the adjustment range is 0 % – 80 %.

On the parameter menu, press to activate the function. Press “Up” or “Down” to select the reject submenu, then press “Left” or “Right” to adjust the values.

You should handle this function with great caution, as it may happen that you suppress echoes from flaws as well. In addition, some specifications expressly forbid using the reject function.

Wave Height Readings

Ha%: The percentage of the waveform accounting for the screen height in windows.

dBa: The dB difference of the waveform relative gate can be shown in windows. When you use this function, you should use Gate A to catch the echoes. Otherwise, it will result in error in reading.

SL: In the windows, the dB difference of the quantitative line relative to DAC curve will be shown. If there is no DAC curve, then it displays SL —-.

Setting Menu

Press  to select the setting menu.

Waveform Filling

This function enables you to adjust the waveform displaying mode.

Select the setting menu, press “Up” or “Down” to select the waveform filling submenu, then press “Left” or “Right” to select off or on. Off refers to enveloping, and On refers to filling.

Color Scheme

You can use the function to adjust the colors on the screen.

Select the setting menu, then press “Up” or “Down” to select the color scheme submenu. Then press “Left” or “Right” to choose one of seven color schemes.

Language

You can use this function to choose a language.

Select the setting menu, the press “Up” or “Down” to select the language submenu. Then press “Left” or “Right” to choose between Chinese or English.

Lighting

You can use this function to set the display lighting.

Select the setting menu, the press “Up” or “Down” to select the lighting submenu. Then press “Left” or “Right” to choose high lighting or low lighting.

Note: When the screen displays high lighting, the battery working time will shorten corresponding. Therefore, you should regulate the screen brightness according to the practical situation on the spot.

Alarming

You can use this function to set whether there is an alarm.

On the setting menu, press to activate the function. Press “Up” or “Down” to select the alarming submenu. Then press “Left” or “Right” to set the alarm. OFF refers to turning off the alarm, while ON refers to turning on the alarm.

Automatic Wave Height

You can use this function to set the percentage of the height of the automatic gain waveform on the screen. The default status is 80 %.

Select the setting menu, press “Up” or “Down” to select the automatic wave height submenu. Then press “Left” or “Right” to adjust the values. The maximum value is 80 %, while the minimum is 20 %.

Date

On the setting menu, press to activate this function. Press “Up” or “Down” to select the date submenu. Then press “Left” or “Right” to set the date.

Press Ok  to switch among year, month, and day.

Time

On the setting menu, press  to activate this function. Press “Up” or “Down” to select the time submenu. Then press “Left” or “Right” to set the time.

Press Okto switch between hours, minute and second.

Parameter Resetting

Select the setting menu, press “Up” or “Down” to select the parameter resetting submenu. Press “Left” or “Right” to choose whether to reset the parameters, and press Ok  to reset the factory defaults. If you want to cancel the resetting, press any key.

In the setting menu, 10 submenus are displayed on two screens, the former five ones on one screen and the latter five ones on the other. You can switch among them by pressing.

 Gate Menu

The most outstanding feature of the digital flaw detector is the ability to display all the analogue values of echoes on the screen by digital signals. When the instrument is required to compare and compute a signal wave, “human” is needed to tell it which echo to trace. Gate is appointed for locking the echo to be measured. The instrument handles and computes the echo inside the gate as well as displays all the data of the highest echo (including data of the sound path, the horizontal distance, the vertical distance, and the height).

The instrument works in a dual-gate mode with Gate A and Gate B. The reading mode of the gate is single gate one. The user can choose Gate A as the current gate.

Press  to activate the gate menu. Press it for odd times to select Gate A, even times to select Gate B.

 Gate A  Menu

Starting of Gate A

Press   for odd times to select the Gate A menu, then press “Up” or “Down” to select the starting of Gate A submenu. Then press “Left” or “Right” to adjust the values. When you adjust the values, you can press Ok to adjust the steps which are divided into 1, 5 and 10.

 Width of Gate A

Select Gate A menu, press “Up” or “Down” to select the width of Gate A submenu, then press “Left” or “Right” to adjust the values.

When you adjust the values, you can press Ok to adjust the steps which are divided into 1, 5 and 10.

Height of Gate A

Select Gate A menu, press “Up” or “Down” to select the height of Gate A submenu, then press “Left” or “Right” to adjust the values.

When you adjust the values, you can press Ok to adjust the steps which are divided into 0.5, 2.5, and 5.

Mode of Gate A

Select Gate A menu, press “Up” or “Down” to select the mode of Gate A submenu, then press “Left” or “Right” to adjust the values.

Off – Turning off the gate which is turning off the alarming and measurement functions.

Display Choice

Display Meaning Display Meaning
Sa The sound path value of the echo in Gate A Ha The height of the echo in Gate A
Sb The sound path value of the echo in Gate B Hb The height of the echo in Gate B
ba The path difference of the echoes in Gate A and B Da The vertical distance from the surface of the work piece to the flaw echo in Gate A
Ra The projection distance from the probe front edge to the flaw echo in Gate A. Db The vertical distance from the surface of the work piece to the flaw echo in Gate B
Rb The projection distance from the probe front edge to the flaw echo in Gate B dBa The dB difference from the echo peak in Gate A to the gate level position
off Close display dBb The dB difference from the echo peak in Gate B to the gate level position

 Gate B Menu

Starting of Gate B

Press  for even times to select the Gate B menu, then press “Up” or “Down” to select the starting of Gate B submenu. Then press “Left” or “Right” to adjust the values.

When you adjust the values, you can press Ok to adjust the steps which are divided into 1, 5, and 10.

Width of Gate B

Select Gate B menu, press “Up” or “Down” to select the width of Gate B submenu, then press “Left” or “Right” to adjust the values.

When you adjust the values, you can press Ok to adjust the steps which are divided into 1, 5, and 10.

Height of Gate B

Select Gate B menu, press “Up” or “Down” to select the height of Gate B submenu, then press “Left” or “Right” to adjust the values.

Mode of Gate B

Select Gate B menu, press “Up” or “Down” to select the mode of Gate B submenu, then press “Left” or “Right” to adjust the values.

Off – Turning off the gate which is turning off the alarming and measurement functions.

Measuring Point

You can use this function to set the measuring point position of the gate.

Select the Gate B menu, press “Up” or “Down” to select the measuring point submenu. Then press “Left” or “Right” to choose the values.

The peak mode refers to the highest information of the echo in the gate, and the front mode refers to the first information when the echo goes through the gate.

Probe Menu

Press   to select the probe menu.

Dual Probes

You can use this function to set the probe types.

Select the probe menu, press “Up” or “Down” to select the dual probes submenu.    Then press “Left” or “Right” to adjust the values.

Probe Zero

There is a certain sound path distance between the probe chip and the coupling surface of the work piece to be detected, thus there will be a sonic time delay. The delay effect can be compensated by setting the probe zero submenu.

Select the probe menu, press “Up” or “Down” to select the probe zero submenu. Then press “Left” or “Right” to adjust the values.

Probe K Value

When the angle beam probe is used, the included angle value (β) between the sound beam in the work piece of the incidence of the sound wave and the surface normal should be set as: K value – k=tgβ.

Select the probe menu, press “Up” or “Down” to select the probe K value submenu. Then press “Left” or “Right” to select the probe K value and the probe angle.

 Front Distance

In the menu, you can set the front edge length value of the probe (referring the distance between the front edge of the angle beam probe to the point of incidence of the probe).

Select the probe menu, press “Up” or “Down” to select the front distance submenu. Then press “Left” or “Right” to adjust the values.

 Work Piece Thickness

On the work piece thickness submenu, you can set the work piece thickness in the vertical direction of the detection plane. When using angle beam probe, the positioning of the vertical depth of the flaws need this value set. The reason is that when non-primary reflection is used in the detection, if the work piece thickness is not considered, it will result that the instrument might produce an outcome that the vertical depth value is larger than the actual thickness of the work piece when it automatically measure the vertical depth.

Select the probe menu, press “Up” or “Down” to select the work piece submenu. Then press “Left” or “Right” to adjust the value.

 Curve Menu

Owing to the diffusion and attenuation of the sound velocity, the echo heights of the reflectors of the same size depend on the distance between the reflector and the probe. The distance amplitude curve is made according to different reference reflectors which are the same size but different in their depths and a curve diagram mode displays the influences and the changes. When the DAC curve is being made, the material of the reference block with artificial flaws should be same as the work piece to be tested.

DAC Echo

Select the DAC menu, press “Up” or “Down” to select the DAC echo submenu. Then press “Left” or “Right” to adjust the value.

Note: The functional option of the DAC echo is used to display the current number of the echo reference points, the maximum quality is 9, and confirm the echo reference points.

Gate A Start

Select the DAC menu, press “Up” or “Down” to select the Gate A start submenu. Then press “Left” or “Right” to adjust the value.

Note: adjust the Gate A position to catch the reference echo.

Distance Compensation

When penetrating through the work-piece, the sonic power of ultrasonic waves always attenuates along with the enlargement of the spreading distance. When detecting the flaws of large work-pieces and severe attenuated materials, the high receiving sensibility is required to discover the small flaw signals.

However, with the ultra-high sensitivity, the crystal interface refection and probe disordered echoes will be high and the near field blind area is enlarged. To solve this problem, this instrument is designed for distance compensation. When the resolving power in the near field is not influenced, only the remote signal will be compensated for its sensitivity so as to improve the testing range of the device significantly. Before using this function, DAC curve should be made first.

Select the DAC menu, press “Up” or “Down” to select the TVG submenu. Then press “Left” or “Right” to adjust.

DAC Curve Mode

This instrument can make DAC curve. Customers can choose straight line or curve line to connect and make DAC curve. This menu can adjust the curve mode.

Select the DAC menu, press “Up” or “Down” to select the Curve mode submenu. Then press “Left” or “Right” to alter between straight line and curve line.

RL

Press twice to select the DAC menu, press “Up” or “Down” to select the RL submenu. Then press “Left” or “Right” to adjust the values.

Note: based on step of 0.5 dB, you can adjust free in the range of -20 dB to +12 dB above the DAC reference line. DAC reference line: a curve formed by the peak values of the echoes of the reference points recorded.

SL

Select the DAC menu, press “Up” or “Down” to select the SL submenu. Then press “Left” or “Right” to adjust the values.

Note: SL can be adjusted free in a range 12 dB higher than the DAC reference line with a step of 0.5 dB, or 20 dB lower, but it cannot be lower than the EL or higher than the RL.

EL

Select the DAC menu, press “Up” or “Down” to select the EL submenu. Then press “Left” or “Right” to adjust the values.

Note: based on step of 0.5 dB, you can adjust free in the range of 0 dB to 20 dB lower than the DAC reference line.

AVG mode

The instrument offers two modes for making AVG curve: bottom and hole.

Press “Curve” key for three times to select the AVG menu, press “Up” or “Down” to select the AVG mode submenu. Then press “Left” or “Right” to change between the two modes.

AVG Curve

This function is used for making AVG curve with the know φ value.

Press “Curve” key three times to select the AVG menu, then press “Up” or “Down” to select the AVG curve submenu. Then press “Left” or “Right” to change the value. In other words, this function is to make curve of φ X. The adjustment range is from φ 0 to φ 90.

Φ Value Calculation

This function is used for calculating the flaw equivalent.

Press “Curve” key three times to select the AVG menu, then press “Up” or “Down” to select the φ value submenu. Then, press Ok to calculate the flaw equivalent value of the present flaw echo in gate A.

Note: to make AVG curve with “Bottom” mode, the sensibility should be preset when the height of the curve in gate A is 20 %-90 % of the full screen; with “Hole” mode, the sensitivity submenu will change into aperture submenu automatically to set the diameter of the hole.

 Memory Menu

Press  to enter the memory menu.

Memory Number

Select the memory menu, press “Up” or “Down” to select the memory number submenu. Then press “Left” or “Right” to adjust the values.

Note: the memory number can be chosen recurrently in the data set ranging from 1 to 1000. When setting the memory, if there is a before the data set memory number, that means the data set is occupied. If you save the data, the original data will be covered. When you adjust the memory number, you can press Ok to set the steps, which are divided into 1, 10, and 100.

Call-out

After the data set is called out, the instrument parameters will be set same as those which are stored, and they will be displayed in freeze mode of the waveform stored.

First, set the memory number as the one you need, then select the option of call-out, press “Left” or “Right”. When it comes to confirm calling out the file on the screen, press Ok to confirm and press any other key to cancel.

Storage

You can store the current parameter setting of the instrument, DAC curve and the waveforms into the data set of an appointed memory number.

First, set the memory number as the number you want, then select the option of storage, press “Left” or “Right”. When it comes to confirm storing the file on the screen, press Ok to confirm and press any other key to cancel.

Note: if there is a before the memory number, that means the data set is occupied. The storage will cover the stored data at this moment.

Deletion

First set the memory number, then select this option, press Ok to confirm, any other key to cancel. If there is a before the memory number, that means the data set is occupied. You can delete the set.

Communication

The flaw detector can exchange data with PC.

Operation of Other Special Functional Keys

  • Automatic Gain: Move the gate to lock the echo that you want. Press to start the automatic gain. The instrument will repeatedly compute the echo inside the gate automatically and adjust the gain automatically until the amplitude height of the largest echo is set to 80 % of the screen height.

Note: the wave height after the automatic gain is related to the automatic wave height setting in the setting menu. If the automatic wave height is set as a certain value (in between 20 % – 80 %), the wave height after the automatic gain is the height of the value on the screen.

  • Freezing: The function can freeze and lock the display on the current screen. In the freezing mode, you can move the gate to measure the echoed signal frozen on the screen.

If you want to freeze the current display, press FREEZE key. If you want to return the normal mode, press again to unfreeze.

  • Wave Peak Memory: Wave peak memory is a function that the instrument compares the “new” with the “old” highest dynamic echoes automatically and preserves the highest still echo.
  • Full Screen: Press FULL SPLIT to enlarge the waveform display area to full screen so that you can observe the echo and the measurement values conveniently. At this moment, the main menu display is canceled. If you want to return to the normal display mode, press FULL SPLIT

 Calibration of the Angle Beam Probe

Concerning the contact detection by angle beam probe, distance calibration is a must before any detection task. There are various kinds of angle beam probes with different structures and sizes, and different detection objects require different K values, thus the sound paths in wedge blocks are not same, in other words, the front edge length of each angle beam probe of transverse wave should be measured to decide the zero-bias value. Along with the probe abrasion during the usage, the angle beam probe need recalibration after a period time of usage.

Calibration Procedures

Set the sound velocity and sound path of the material known on the parameter menu, primary echo is adopted generally.

  • Calibration of the front edge of the probe.
  • Calibration of the zero of the probe.
  • Calibration of the probe K value (angle).

Skills of Using the Instrument

When you use the instrument to detect the work piece, it is very necessary to make full use of all sorts of powerful functions of the instrument to guarantee the accuracy of the detection and to improve efficiency.

Flexible usage of the Gate

By adjusting the start of Gate A, its width, and its height, you can use Gate A to catch the echo signal to be measured, you can also directly read the sound path, the horizontal distance, the vertical distance, and other values of the echo inside the gate on the screen.

By setting the gate mode, you can set Gate A and B as the afferent echo alarm gate and the echo loss alarm gate.

Making the best of the prompting messages on the screen during the operation process

When you operate the instrument and some operations need confirming by the operator, on the upper part of the screen displays the prompting messages.

Examples are storage, deletion, freezing, etc., when we operate the instrument, there will be corresponding prompts on the screen.

Saving and calling the instrument status and the detection parameters

The instrument is able to store 1000 sets of detection status data (including echo waveforms, DAC, etc.).Therefore, you can store the detection status data and DAC curves which are calibrated well for different probes or various work pieces into different records, and you can call out the corresponding saved record before detection. The detection can start as soon as the data are unfrozen so that you can switch among different detection statuses. It is easy for management, and at the same time, the complicated calibration work is alleviated.

Using batteries to reduce interference

When the AC mains are disturbed by the strong interference signals, you should use batteries. By using batteries, you can cut off the interference signals in the AC mains effectively, and other external interference signals will not influence the instrument. When you work in an outdoor place, you should prepare spare batteries.

Switching the display modes

In the normal display mode, Press full screen, the echo display will be enlarged to the entire screen, at this point, the main menu and the submenu are hidden as shown in the figure

In the full screen mode, except the functions of automatic gain, wave peak memory, and freezing are available, other functions will be locked and unavailable. This feature is helpful to prevent mal operation when the detection is on site. If you want to return the normal mode, press the full screen again. After the instrument has been calibrated, and when you start detection, you can switch to the magnification display mode to observe the echo conveniently.

 Peak value memory function

When the function is enabled, the screen will record the highest point of the echo and join all the points with dashed line to form an envelope line, when a higher echo emerges, it will refresh the memory point at this position, otherwise, it keeps unchanged.

Instrument maintenance

Use the standard connecting cables and communication cables and other accessories attached with the probes. Unmatched cables may result in electric circuit breakdown inside the instrument or cause damage to the sockets. Any liquid should be absolutely prevented from flowing into the instrument.

In the process of transporting or moving, don’t drop and hit the instrument. Strong vibration, getting wet in snow and rain should be avoided.

The outside of the instrument should be cleaned each time after operation. Then put it at a dry and ventilated place indoors.

 Batteries replacement

The batteries in this instrument usually can be used for 3 years. When they don’t work, users can replace them with batteries of the same type. Please follow the steps below:

  1. Unscrew the battery compartment behind the main unit.
  2. Uncover the battery compartment and take out the failed batteries.
  3. Install the recharged batteries or new batteries correctly (Do not connect the wires inversely with the anode and the cathode of batteries). Please use six LR14 batteries and pay attention to the directions of the anode and the cathode.
  4. After the new batteries installed, turn on the power and check whether the instrument can work.
  5. Cover the battery compartment and tighten the screws.

Communication between the Instrument and the Computer

 The Communication between Ultrasonic Flaw Detector with DAC Curve (Warning Function) and the computer and the use of data processing software.The communication function means transporting the pre-saved waveforms and related parameters in the instrument into the computer and generating flaw detecting reports, which can enable the computer to control and manage the ultrasonic refractometer. It can realize single width transfer and continuous transfer. Connect one end of the communication cable with the communication interface. The red pot of the interface should be aligned with the red pot on the instrument. The other end of the communication cable should be connected with the COM1 (or COM2) interface on the PC. The instrument will transmit the saved graphs and data to the PC. The client software installed on PC can edit, save or print these graphs and data.

 Operating steps:

  1. Connect the instrument and PC with the communication cable.
  2. Press to enter the save menu. Use the up and down keys to select the communication submenu. Use right and left keys to turn it on. Then the instrument is ready to connect the PC.
  3. Open the communication software DDIclient.exe, and tap in the file scopes for download. Then press the download button.

Note:

  1. Pulling out the communication cable or shutting down the software during communicating will fail the communication and lead to the breakdown of the instrument.
  2. Restart the instrument if the communication fails. The software is programmed with C++.

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