Flaw Detector with Automated Calibration (Metal Housing)

This Flaw Detector with Automated Calibration (Metal Housing) is designed to locate, evaluate and diagnose various defects with scanning range of 0 inches to 393.70 inches (0 mm to 10000 mm).

GT00XY00ZB

Description

Overview

GAOTek Flaw Detector with Automated Calibration (Metal Housing) is a high speed flaw detector with scanning range of 0 inches to 393.70 inches (0 mm to 10000 mm). It is designed to locate, evaluate and diagnose various defects without any distraction. An automated three staff gauge switch makes it a unique instrument.  Data communication can be performed using RS232 interface 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. This instrument can be also be broadly used in the active safety inspection and service-life evaluation in such fields as aerospace, railway transportation and boiler pressure vessels, etc.

Key Features

  • Automated calibration of transducer Zero Offset and/or Velocity
  • Automated gain, Peak Hold and Peak Memory
  • Automated display precise flaw location(Depth d, level p, distance s, amplitude, sz dB
  • Automated switch three staff gauge ((Depth d, level  p, distance s)
  • 500 independence setup, any criterion can be input freely, we can work in the scene without test block
  • Big memory of 1000 A graph.
  • Gate and DAC alarm, Acoustic-Optical alarm
  • USB port, communication with pc is easy
  • The embedded software can be online updated
  • Li battery, continue working time up to 10 hours
  • There are 14 standards of DAC
  • Display freeze
  • Automated echo degree
  • Angles and K-value
  • Lock and unlock function of system parameters
  • Electronic clock calendar
  • Two gates setting and alarm indication
  • High-speed capture and very low noise
  • DAC, AVG, TCG, B Scan. Solid metal housing (IP65)
  • Automated calculates the size of the flaw with wide bottom type in AVG function.
  • 6dB DAC functions
  • Provides high contrast viewing of the waveform from bright, direct sunlight to complete darkness and easy to read from all angles
  • Powerful pc software and reports can be export to excel

Technical Specifications

Scanning Range 0 in to 393.70 in (0 mm to 10000 mm)
D-Delay -20 µs to +3400 µs
P-Delay 0.0 µs to 99.99 µs
MTLVEL 1000 m/s to 15000 m/s
Working Mode Single probe (receiving and sending), double probe (one for receiving and another for sending), transmission  (transmission probe)
Frequency Range 0.5 MHz to 20 MHz
Gain Adjustment 0 dB to 130 dB
Reject 0% to 80% of screen height, step: 1 %
Vertical Linear Error Vertical linear error is not more than 3 %
Horizontal Linear Error Not more than 0.2 % in the scanning range
Sensitivity Leavings ≥62 dB
Dynamic Range ≥34 dB
Alarm Three modes, i.e. forbidden wave, loss wave and auto
A-Scan Display Area Full screen or local

A-Scan display freezing and de-freezing  A-Scan filling

Data Save 800 A-Scan images (including setting of instrument)
Standard Communication Interface USB
Measuring Unit Inch/mm
Battery Li battery 7.4V  4800 mAh
Power Adaptor Input 100 V to 240 V/50 Hz to 60 Hz

Output 9 VDC/1.5 A

Working Temperature -4 F x 122F (-20 C to 50 C)
Working Humidity 20 % to 90 %
Port Type BNC
Overall Dimension 9.44 in x 7.08 in x 1.96 in (240 mm × 180 mm× 50 mm)
Weight 3.96 lbs (1.8 kg)

Additional Information

Designation of the Instrument’s Components

How to Use:

  1. Get ready the job;
  2. Insert the probe plug into the probe socket of the host, rotate tightly the locking nut;
  3. press , turn on the instrument;
  4. It will carry out self-test; In normal case, when you turn on the unit, it will automatically enter into the status that it is in during last turning off. The instrument parameters are consistent with last turning off, but the waveform during last turning off will not display.
  5. Check voltage of the battery; if the power monitor shows that the voltage is low, it will turn off automatically 1 min after alarming bell.
  6. According to your application, ten independence setups can be applied, any criterion can be input freely, and we can work in the scene without test block. Whether it needs to calibrate the instrument, if yes, ask a professional technician to calibrate it;
  7. Measure;
  8. Save the results, big memory of 300 A graph
  9. Turn off the instrument;

3 Description of Screen Display

Three Display Modes of Screen

Manual B-scanning

Description of functions and operation way

Adjustment of BASE Group

In the BASE functional group, users can adjust and set the functional items relative with the display range, including RANGE, MTLVEL, D-DELAY and T-VALUE.

During the detection, the display range of screen is in great relation to the material of work piece and probe’s nature. The work piece material will influence the transmission velocity of ultrasonic wave.

Detection Range (RANGE)

It is to set the measuring range for screen display during detection

Range: 0 in to 39.3 in (0mm to 1000mm)

If what selected currently is RANGE functional menu, then by pressing , it is allowed to shift between Rough and Fine adjustment.

Operation:

By <Page up> key, switch the function page.

Select BASE functional group by <F1> key, and by “↑” or “↓” key, select the functional menu for RANGE, and then adjust parameters for RANGE by  “+” or “﹣”  key.

Users can shift the Rough and Fine adjusting mode by key

Material velocity (MTLVEL)

Users are allowed to set the transmission velocity of ultrasonic wave in work piece.

Range: 1,000m/s to 15000m/s

If what selected currently is MTLVEL function menu, then by the key , it is allowed to shift between Rough and Fine adjustment.

Operation:

By <Page up> key, switch the function page.

Select BASE functional group By <F1> key, and by “↑” or “↓” key, select the functional menu for MTLVEL, and then adjust parameters for MTLVEL by  “+” or “﹣”  key.

Users can shift the Rough and Fine adjusting mode by Enter key .

Thickness of work piece (T-VALUE)

It is to set the thickness of work piece during detection.

Thickness range: 0.039 in to 3.93 in (1mm to 1000mm)

Rough and Fine adjustment can be switched by the key .

Operation:

By <Page up> key switch the function page.

By <F1> key select BASE functional group, and by “↑” or “↓” key, select the functional menu for T-VALUE, and then adjust the job’s thickness by  “+” or “﹣”  key.

Users can shift the Rough and Fine adjusting mode by Enter key .

Adjustment of PROBE Group

With this functional group, it is allowed to adjust and set the functional items in relation to ultrasonic sending and receiving, including PROBE TYPE/ PROBE POS, ANGLE/K-VALUE, P-DELAY/ X-VALUE, X-COORD/ PART DIA

PROBE TYPE/ PROBE POS

This menu is multipurpose for setting probe type and probe pos; by key , shift between probe type and probe pos.

PROBE TYPE:

Setting of ultrasonic probe: If the current probe is an echo probe, then set it to single (straight or angle); if it is a double-wafer probe, set it to DUAL, and if it is a through transmission probe, set it to THRU.

Select position of probe when we detect a pipe.

Options: Outside surface

Probe is placed on the outside surface of pipe, now, the corrected d value show the depth of the flaw from the outside surface of pipe, L value show the distance between flaw and probe front edge follow outside surface.

Inside surface:

Probe is placed on the inside surface of pipe, Now, the corrected d value show the depth of the flaw from the inside surface of pipe, L value show the distance between flaw and probe front edge follow inside surface.

Operation:

By <Page up> key switch the function page.

By <F2> key select PROBE functional group, and by “↑” or “↓” key, select the functional menu for PROBE POS, and then select probe posting by  “+” or “﹣”  key.

Probe Angle (ANGLE)/Probe K Value (K-VALUE)

This menu is multipurpose for setting probe angle and probe k value by key  , shift between ANGLE and K-VALUE.

ANGLE:

It is to adjust the angle of a probe.

Operation:

By <Page up> key switch the function page.

By <F2> key select PROBE functional group, and by “↑” or “↓” key, select the functional menu for ANGLE, and then adjust the probe angle by “+” or “﹣” key.

K-VALUE:

Operation:

By <Page up> key switch the function page.

By <F2> key select PROBE functional group, and by “↑” or “↓” key, select the functional menu for K-VALUE, and then adjust the probe k value by “+” or “﹣” key.

P-DELAY/ X-VALUE

This menu is multipurpose for setting p-delay and x-value by key , shift between P-DELAY and X-VALUE.

P-DELAY:

User can set the zero point of probe during detection, viz. P Delay. It is necessary to compensate the delay in probe resulted from acoustic beam in the pitch interval from energy exchanger to work piece by P Delay.

Range: 0µs to 99.99 µs

Step graduation:  0.01 µs

Operation:

By <Page up> key, switch the function page.

Select PROBE functional group By <F2> key, and by “↑” or “↓” key, select the functional menu for P-DELAY, and then adjust parameters for P-DELAY by  “+” or “﹣”  key.

X-VALUE:

It is to set the front edge of probe.

Range: 0 in to 0.39 in (0.00 mm to 50.0 mm)

Step:    0.039 in (0.01mm)

Operation:

By <Page up> key switch the function page.

By <F2> key, select PROBE functional group, and by “↑” or “↓” key, select the functional menu for X-VALUE, and then adjust the probe front edge by “+” or “﹣” key.

X-COORD/ PART DIA

This menu is multipurpose for setting X-COORD and PART DIA, by key  , shift between X-COORD and PART DIA.

X-COORD

Coordinate mode means the definition of the horizontal coordinate line, including “S-PATH” “P-VAL” and “DEPTH”, when the refraction angle is not zero, the function above is effective, when it is zero, and the coordinate is defined as S-PATH.

Options: S-PATH, P-VAL, DEPTH

Operation:

By <Page up> key switch the function page.

By <F2> key select PROBE functional group, and by “↑” or “↓” key, select the functional menu for X-COORD, and then adjust the coordinate mode by “+” or “﹣” key.

PART DIA:

When we detect a pipe, we must input the outside diameter of part and thickness exactly. Part diameter is the outside diameter of pipe.

Operation:

By <Page up> key switch the function page.

By <F2> key select PROBE functional group, and by “↑” or “↓” key, select the functional menu for PART DIA, and then adjust diameter value by  “+” or “﹣”  key.

Adjustment of MEM Group

This is for adjusting the memorizing modes, calling out, deleting and saving the configured data and detection parameters. It includes such functional menus as DATA NO, RECALL, SAVE and DELETE.

Function group MEM (DATA NO.)

It is for setting the MEM group No. after selecting the functional menu for Group No..

Operation:

By <Page up> key switch the function page.

By <F4> key select MEM functional group, and by “↑” or “↓” key, select the functional menu for DATA NO, and then set group no. by  “+” or “﹣”  key.

Recalling a stored data set (RECALL)

It is to recall data under Waveform Save mode, and call out the data corresponding to current group when the recalling succeeds, the current waveform and detection parameters will be substituted by the saved waveform and detection parameters, and the waveform is frozen.

Operation procedure:

By <Page up> key switch the function page.

By <F4> key select MEM functional group, and by “↑” or “↓” key, select the functional menu for

Storing a data set (SAVE)

This functional menu is for saving data. It is to save the current waveform data into the current group no. depending on the displayed save mode. Operation:

By <Page up> key switch the function page.

By <F4> key select MEM functional group, and by “↑” or “↓” key, select the functional menu for SAVE, and then carry out saving by“+” or “﹣” key.

  1. Before saving data, do make sure that there is no data in the data group corresponding to current group no, otherwise it will not work
  2. Set the current saving mode correctly
  3. If you need to upload the DAC curve to PC, please adjust the settings and DAC parameters firstly, and then save the data
  4. If the current group has already got waveform data, the saving action is invalid and it will prompt with buzz.

Deleting a data set (DELETE) /CLEAR ALL

It is to delete data. This is to delete the data corresponding to current group no, when the deletion succeeds, “*” before this group no. disappears.

Operation:

By <Next Page > key switch the function page.

By F4 key select MEM functional group, and by Up/Down key, select the functional menu for DELETE.

If current group no. has no data in it, by the rotary knob, this functional menu will always display OFF; if there is data existing in the group, by  “+” or  “﹣” key, it will show “Yes/No”, and now press the <Enter> key, the data will be delete, and press any other key to cancel delete.

CLEAR ALL:

By <Next Page > key switch the function page.

By F4 select MEM functional group, and by Up/Down key, select the functional menu for DELETE.

By “+” or “﹣” key, the menu will show “Yes/No”, if you press the <Enter> key then you will delete all datas. And by pressing any other key, you will cancel the clear.

It is used for adjustment of gate settings, including Gate logic, Gate alarm, Gate start, Gate width and Gate height.

Functions of gate during detection:

To monitor whether the job has flaws in the set logic and range, if yes, it will alarm.

It is equipped with double-gate function: Gate A and Gate B, normally Gate A is used alone for detecting the work piece flaw, and the double-gate is usually used in the measuring and calibration of multi-echo.

GATE LOGIC/ ALARM

This menu is multipurpose for gate logic and gate alarm. Users can shift the functions for GATE LOGIC and ALARM by Enter key .

GATE LOGIC:

Gate logic has four options: NONE, POS, NEG, and MUL.

POS:      when the echo amplitude is higher than the preset threshold of the gate, it will alarm

NEG:    when the echo amplitude is lower than the preset threshold of the gate, it will alarm

MUL:    state of double gates

Operation:

By <Page up> key switch the function page.

By <F5> key select GATE functional group, and by “↑” or “↓” key, select the functional menu for GATE LOGIC, and then adjust the gate logic by  “+” or  “﹣” key.

Response and measurement threshold (a THRESH/thresh)

This functional menu is multipurpose for Threshold of Gate A and Gate B, when this menu is selected, by  you can shift the two functions.

ATHRESH:

It is to set the threshold of Gate A. The parameter is expressed in percentage, i.e. the percentage in relative to the full amplitude.

Parameter range: 2 % to 90 %

Operation procedure:

By <Page up> key switch the function page.

By <F5> key select GATE functional group, and by “↑” or “↓” key, select the functional menu for a THRESH, and then adjust the threshold of Gate A by “+” or  “﹣” key.

BTHRESH:

It is to set the threshold of Gate B. The parameter is expressed in percentage, i.e. the percentage in relative to the full amplitude.

Parameter range: 2 % to 90 %

Operation procedure:

By <Page up> key switch the function page.

By <F5> key you select GATE functional group, and by “↑” or “↓” key, you select the functional menu for b THRESH, and then adjust the threshold of Gate B by “+” or “﹣” key.

Auto C (Automated calibration of transducer)

Calibration of straight probe (CSBT)

For the convenience of user’s calibration of probe zero point and sound speed of material, the function of calibration is built in the gauge. Furthermore, users can also do the calibration of probe.

Calibration of angle probe (CABT)

For the convenience of user’s calibration of probe angle, front edge, zero point and sound speed of material, the function of calibration is built in the gauge. Furthermore, users can also do the calibration of probe as per below image. Angle probe can be calibrated with the following method. Before calibration, you must select type of calibration, IIW TYPE2 and Two holes.

  1. IIW TYPE2

2.Two holes

CSK-IIIA

Types of calibration

IIW TYPE2 and Two holes are the two kinds of calibration. There is only a difference of angle probe; the calibration of straight probe is only one way.

Calibrate the probe

  • Set Velocity.
  • Set right display range
  • Put the probe on test block reference hole, For example IIW Type I, 1.5 mm dia. Hole. Adjust the gain until back echo raise to 80% full screen
  • Press “ Gate”, move a Gate across the echo, adjust the gate length, high
  • Press “FN” key move the high-light cursor to “AWS” position. Select AWS REFRNCE dB, press “+” key to get REFRNCE dB.

Now the instrument will automatically adjust the gain, the echo in the A Gate will automatically raise or decrease to 50% full screen.

After complete AWS setting, it can start inspection

Move the probe detected the flaw.

Move A Gate cross flaw echo.

Select AWS INDICA dB, press “+” key to get INDICA dB.

Now the instrument will automatically adjust the gain, the echo in the A Gate will automatically raise or decrease to 50% full screen.

Now, the instruments will automatically calculate the ATTEN and RATING.

Test Data Display

We can select display method of measure result on the top right corner of display area. One of S-path, Projection and Depth will be displayed here and the other two will appear in the status bar. When dB is displayed, values S-path data got from DAC curve will appear on the screen. If DAC curve is turned off or the waveform in gate is over the screen, dB will appear as “*”.

Options: S-PATH, P-VAL, DEPTH, VAL-SZ, VAL-mm

Calibration and Measurement of the instrument:

Before working, it is necessary to calibrate the sound speed, pitch interval and probe delay for the instrument, so as to be adaptive to the detection condition. Where, the reason for calibrating sound speed and probe delay is that the calculation of parameters displayed in the status line is relative with sound speed and probe delay, therefore you must calibrate before detection; while the purpose for calibrating pitch interval is to make it display waveform in proper range of pitch interval on the screen, so as to judge and evaluate the defects better.

In order to operate the instrument safely and correctly, the calibrated shall be calibrated by a professional technician from field of ultrasonic detection.

In order to illustrate well the calibrating way and steps, examples will be given later.

Calibrating of Single Probe

You should determine the calibrating procedures depending on the known condition of sound speed and probe delay. If the sound speed is unknown, you first calibrate the sound speed by way of “Two Points”; if the sound speed is known, calibrate the probe delay by one-point way after adjusting the sound speed into the known one.

Calibrating with Known MTLVEL

Procedure:

The MTLVEL setting is the known sound speed of the material,

Couple the probe with the calibrating test block,

Set the Gate Logic into Single-Gate mode, i.e. Positive or Negative logic, loop the gate on the primary echo, now the pitch interval measured is the pitch interval at primary echo,

Adjust the probe delay, so that the measurement of pitch interval in the status line is the same with the known thickness of the test block.

Calibrating with Unknown MTLVEL

Procedure:

First set a rough sound speed value;

Adjust the gate logic into Double Gate mode;

Couple the probe with a test block for which the thickness is known and that is of the same material with the job;

Move the start of gate A to the primary echo and make them intersect, adjust the height of gate A to be lower than the max. Amplitude of primary echo and to a proper position, and gate A shall not intersect with the secondary echo;

Move the start of gate B to the secondary echo and make them intersect, adjust the height of gate B to be lower than the max. Amplitude of secondary echo and to a proper position, and gate B shall not intersect with the primary echo;

Then adjust the sound velocity, so that the pitch interval displayed in the status line is same with the actual thickness of the test block. The sound velocity got now is the actuate sound velocity under this detection condition;

Set the Gate Logic into Single-Gate mode, i.e. Positive or Negative logic, the pitch interval measured at this time is the pitch interval at primary echo;

Adjust the probe delay, so that the measurement of pitch interval in the status line is the same with the known thickness of the test block. The probe delay measured at this time is the exact P delay of this probe.

Calibrating with unknown MTLVEL

MTLVEL is unknown, set the approximate MTLVEL as 5920m/s, set the Gate Logic as double gate mode, meanwhile set the P delay as 0;

Couple the probe with a calibrating test block of 1.96 in (50 mm), and adjust the gate A to a position intersecting with the primary echo, Adjust gate B to a position intersecting with secondary echo;

Calibrating MTLVEL Calibrating P-DELAY

Increase MTLVEL, till the displayed pitch interval between the primary and secondary echo is 50mm, now we get the exact sound velocity of the material, i.e. 5891m/s; Set again the gate as Single Gate mode, measure the pitch interval at the primary echo, adjust continuously P Delay till the pitch interval measured at the primary echo is 50 mm, now we get the exact P Delay, i.e. 0.05us.

Calibrating of Double Probe

Calibrating procedure:

Set double-probe state in PROBE group;

Set the pitch interval, functional items in PROBE group depending on current testing task and probes selected;

Couple the probes with the calibrating test block, adjust the P Delay in Base group till the calibrating echo approaches to the desired position, meanwhile the secondary echo is also within the display range;

Adjust the gain till the echo with the max. Amplitude approaches to the full-screen height;

Turn on double gates in Gate group;

Select Front-edge measuring way in CFG group;

Move the start of Gate A to the primary echo and intersects with it, and Gate A shall not intersect with the secondary echo;

Move the start of Gate B to the secondary echo and intersects with it and Gate B shall not intersect with the primary echo;

Adjust gate heights, so that they are at the same positions of the front edges of two standard echoes;

Change the sound velocity, till it displays the thickness value of the standard test block;

Set the Gate Logic into Single-Gate mode, i.e. Positive or Negative logic, the pitch interval measured at this time is the pitch interval at primary echo;

Adjust the probe delay, so that the measurement of pitch interval in the status line is the same with the known thickness of the test block.

Calibrating of Angle Beam Probe

Calibrating of angle beam probe is usually as following:

  1. Calibration of incidence angle (X-Value)

Test the probe zero point with W test block (Holland test block) or CSK-A test block, firstly adjust the sound speed to 3230m/s, detecting range to 5.90 in (150 mm), then start the testing, locate the probe on test block and move it as the right figure to make sure you have got the highest echo on R 3.93 in (100 mm)  reflector, measure the distance, which is the X-Value of probe, between the front face of probe and cycle centre of R 3.93 in (100 mm) arc. The point corresponding to the cycle centre of R 3.93 in (100 mm) arc is just the incidence point of probe.

  1. Calibration of probe angle (K-Value):

The probe plotted with angle value can be calibrated with W test block, and the probe plotted with K-Value can be calibrated with CSK-A test block. Both the two kinds of test blocks have the scales of angle and K-Value, select the proper scale for the probe ( as shown on the right figure, on the upside of W test block probe of 60 to 76 degrees can be calibrated, the downside is suitable for the probe of 74 to 80 degrees. And on the upside of CSK-A test block probe of K2.0, K2.5, K3.0 can be calibrated, the downside is suitable for probe of K1.0, K1.5). Locate the probe as the right figure shows, move the probe back and forth to make sure you have got the highest echo, and now the scale corresponding with incidence point is the probe angle or K-Value.

When the focus on angle menu, press  key , we can input L value (above picture ),and then press  key again, the unit will calculate the angle value.

  1. Calibration of sound speed:

find out the highest echo in item 1, and adjust the detecting range to make sure the second echo of this echo can be displayed on the screen, switch the gate mode to double gate, adjust the A gate to cut with the first echo, and adjust B gate to cut with the second echo, adjust the sound speed to make the value of sound path(S) be 100, now the sound speed value you get is the actual sound speed.

  1. Calibration of probe zero point:

Keep the testing status above, and change the gate mode to plus or minus, adjust the probe zero point to make the value of sound path (s) return to 100, now the zero point value is the actual zero point value.

Angle beam probe can be calibrated in many ways, not only by standard test blocks, it can also be done with a thickness known hole, theoretically, smaller of the reference reflector more accurate calibration you will get, however, it will be more difficult to do so. When calibrating with holes, we can do the calibration on angle by working out slope through measuring the depth and level position of hole, and with which processing the calibration of sound speed and probe zero point.

Application of DAC Curve

DAC curve is used for distinguishing the reflectors with the same size and different distance. Normally, in work piece, reflectors with the same size and different distance cause change in amplitude because of the attenuation of material and pervasion of beam. The DAC curve compensate for attenuation of material, magnetic field influence, pervasion of beam and surface smoothness in the way of graph. Normally, the echo peak points are all located in the same DAC curve. And in the same way, the echo created by smaller reflectors will be located under this DAC curve, and the bigger one will be above the curve.

The screen is divided into three areas. The three curves will be drawn on the screen during the detecting; users can determine the flaw character by the height of the echoes.

Measurement

To use the detector for measuring, you shall carry out the following works:

Set the start of gate, gate width, gate threshold and gate alarming way.

Matters needing attention before measuring:

The calibration including sound speed and P delay shall be completed, and the measuring way can be selected as front-edge and peak way. The wave amplitude measured is the max. Echo amplitude within the gate. With front-edge measuring way, the pitch interval measured is the pitch interval at front edge of echo within gate (up line of echo waveform curve).Therefore, when front-edge way is selected, the measurement on echo amplitude in the gate is influenced by the gate threshold (height).

The measurement of pitch interval can be done only when the gate is open, before measuring, you should select the measuring way: edge way and peak way. Then select single or double gate way. Under single-gate way, the measurement is the pitch interval at echo’s front edge or peak in the gate. Under double-gate way, the measurement is the pitch interval starting from the echo within gate A and ending at the echo in the gate B.

List of Operations

All operations are realized by direct triggering of different key(s) on the panel or combination of them. The following list shows the concrete icons, names and functions of panel keys.

Figure Name Function
  Fn Press Fn key to select corresponding function group listed at the bottom, and all function items in this group will display at the right.
  Direction Press “←” or “→” key to adjust parameters; and press “↑” or “↓” key to select items in the group.
  Confirm Press “Confirm” key for switch of multi-used function item. Primary or fine adjustment of function items (if available) can be selected via “Confirm” key.
  Gain + Press Gain + key to increase the gain by set step. Gain adjustment range is 0 dB to 130 dB.
   Gain – Press Gain – key to decrease the gain by set step. Gain adjustment range is 0 dB to 130 dB.
  Gain step Press “Gain Step” key, the gain step will display 12.0 dB, 6.0 dB, 2.0 dB, 1.0 dB, 0.5 dB, 0.2 dB and 0 dB in cycle. Select suitable gain step for fast adjustment of gain.
  Freezing During operation, press “Freezing” key to freeze the wave and data displayed on the screen. Press again for defreezing.
  Extend key To extend the display and show detail of waveform
  PageUp/PageDown All function groups are arranged in different pages, press “PageUp/PageDown” key to go to expected page.
  Auto gain Adjust the amplitude of the echo in gate to X % (10 % to 100 %) of the screen height automatically.
  Peak Memory Press “Peak Memory” key to enable/disenable peak memory.
  Measure Display Press “Measure Display” key to select display method of measure result.
  Soft power switch Start/shutdown the machine.
+ Combined Key 1

↑ key

+

Gain Step

1. Press “Combined Key 1” as start up and loading of the program to restore ex-factory configuration.

2. To avoid accident change to current flaw detection parameters in the operation window, press “Combined Key 1” to lock the menu. Press “Combined Key 1” again to unlock.

+ Combined Key y 2

↓ key

+

Freezing

1. Press “Combined Key 2” as start up and loading of the program to enter communication status.

2. To avoid accident deletion of stored flaw detection curve in the operation window, press “Combined Key 2” to lock the curve. Press “Combined Key 2” again to unlock.

3. To avoid accident deletion of configuration of current setting in the operation window, press “Combined Key 2” to lock the setting. Press “Combined Key 2” again to unlock.

C Charge LED This LED (Green) illuminates during charging and goes off as charge ends.
A Sleep LED This LED (Red) illuminates as the machine sleeps and goes Off at other status.

6 dB DAC CURVE SETTING STEPS

1.Open DAC. Set the DAC MODE to Line.

2. Record the first point.

3. Record the second point.

4. Record the third point.

5. Press  to inter 6dB DAC. Two conditions:

1) Focus on RECORD;

2) The count of DAC points >=3

‘A’ mark will appear. And the echo will be doubled (6dB) from the third point. (The start point must >=3)

  1. Record the fourth point.

7.Record the fifth point.

8.Record the sixth point.

9.If we want to exit 6dB DAC mode, we must delete the points behind the start point (the third point), then Press to inter 6dB DAC. When the focus is on ‘RECORD’;

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