EUT900 Digital Ultrasonic Flaw Detector

Chapter 1 Introduction

This machine is a cost-effective digital ultrasonic flaw detector, which can quickly and cost-effectively detect various defects such as internal cracks, inclusions, pores, and looseness in workpieces. A powerful tool for quality control in pressure vessels and other fields. It better solves the problem of inconvenient operation of some digital instruments. This machine only has a first-level main menu, so there is no need to remember the relationship between the main and submenus in order to change a parameter, and it has a special code The knob can easily change the menu number. After the instrument is adjusted, the sound path, gain, delay, moving gate and other functions can be changed without changing the menu number when detecting flaws, thus improving the flaw detection efficiency. 3 coding knobs are used to adjust parameters and set gain, sound interval, displacement, and change the gate position. Changing parameters is very fast, just like operating a traditional flaw detector, which is very convenient to use. The instrument uses 4 ordinary Ni-MH rechargeable batteries, and the battery update cost is very low. The main board is a single board structure, which uses surface-mounted components and FPGA gate array devices, and has fewer connectors, so its performance is reliable. The size of this machine is about 230x146mm, the thickness is only 37mm, and the weight is about 950 grams with battery. It is very lightweight, the price is close to the analog machine, and the usage method is close to the analog machine.

Please take a closer look at the 36 items exemplified below, some of which were first created by the company, and some were improved. The performance characteristics of this machine are as follows:

1) TFT industrial color LCD display (320x240, 5.7 inches), LED backlight, power saving, long life and reliable.

2) The real-time sampling frequency is 50MHz and the equivalent sampling frequency is 200MHz. This not only reduces costs, reduces power consumption, but also displays waveform details perfectly.

3) * The power consumption of this machine is only about 2W. It can work continuously for about 5 ~ 6.5 hours with 4 No. 5 2500mAh Ni-MH rechargeable batteries. Ordinary No. 5 alkaline batteries can also be used in emergency. Compared with the use of custom lithium battery boards, the battery renewal fee is quite low, and it also saves the trouble of purchasing original batteries.

4) * For normal flaw detectors, the sound path division of the horizontal axis on the display is fixed at 10 equal divisions. When fine-tuning the range of the sound path, the sound path represented by each division also changes slowly, making the sound path estimation very different. Convenience. The company's first integer variable division, the sound path represented by each division is always an integer multiple of 1, 2, 5, 10, and the estimated echo path is very intuitive.

5) The transmitted pulse is a negative square wave with an adjustable width, which improves the probe's emission efficiency and the echo, which improves the ability to find small defects.

6) * The left and right split-screen display mode of the echo display area pioneered by our company. The left screen displays the defect wave of the bottom wave once, and the right screen displays the high order bottom wave, such as 10 times the height of the bottom wave. Clear, visible in the distance.

7) * Has a unique waveform expansion function, the degree of expansion has nothing to do with the width of the entrance gate (most products on the market are related to the width of the entrance gate, in order to change the degree of expansion, you must repeat the operation), you can change the extension arbitrarily After the waveform is expanded, the delay can still be adjusted, so that you can take a closer look at any part and return to the original sound interval and delay when you exit the expansion.

8) * With extension point indication function. After opening the extension, a small triangle is displayed below the horizontal axis, indicating that this point is the extension point. When the sound path is changed, the echo position at this point will not change.

9) * Before the echo chart is frozen, regardless of the sound path size, the sound path, delay and waveform expansion can be adjusted in full range after freezing, which can facilitate the careful analysis of echoes in different places.

10) * The alarm volume can be adjusted in three levels: strong, medium, and weak. You can also connect an external headset to adapt to a noisy working environment.

11) Multi-function power monitoring function. The lower left corner of the display shows the voltage, current, and discharge in a circular manner, so that the operator knows the condition of the battery.

12) * With dynamic waveform drawing function, it can draw dynamic waveform curve (the relationship between moving probe and echo height), which is convenient for analyzing the nature of defects.

13) * With interface wave lock function, liquid immersion method can be used for flaw detection or thickness measurement. The interface wave is locked at the beginning of the sound path (zero point of the sound path), so that the jitter of the interface wave is eliminated, and the defect echo or the workpiece bottom wave will not be shaken. The entire display area can be used to display the echo, and Change the sound path arbitrarily without affecting the interface wave lock. In the upper right corner of the display

Open a small window of 64x40 dots, similar to the picture-in-picture function of a TV, displaying the interface wave lock in a small window in real time.

14) 30 flaw detection configuration channels can be preset, no need to bring test blocks to the scene for adjustment.

15) Can store 127 echoes and parameters, and 4000 thickness measurement data.

16) There is a measuring gate (also called the entrance gate), which is displayed by a solid line, and a missing wave alarm gate (also called the B gate), which is shown by a dashed line. The missing gate can be closed when not in use.

17) The parameters such as the sound path, height, and equivalent aperture of the highest echo in the entrance gate are displayed in real time, and various parameters are refreshed about 4 times per second (refreshing too fast but not clear).

18) Can measure material sound velocity, probe delay and K value.

19) DAC, AVG curve is automatically generated, and it can float with changes of gain, pitch, and delay (translation). When making DAC curve multi-point sampling, the sampling order is arbitrary (the sampling point is not required to be near to far, and sampling can be skipped, which can reduce the number of flips of the test block). When multi-point sampling, the gain, sound interval, Delay. When making AVG curves, you can also sample the bottom wave.

20) For oblique probes, the 2nd to 4th wave depths are automatically calculated based on the plate thickness and expressed as Y2 to Y4.

21) With peak memory and echo envelope function. The peak echo or envelope is shown as a dashed line, while the real-time echo is still shown as a solid line. The color of the dashed and solid lines can be different, allowing the operator to observe the relationship between the two in real time.

22) With B-scan function, it can display the cross section of the workpiece.

23) * High-speed auto height function. Press the auto height key once to adjust the echo in the entrance door to about 80% height within 1 ~ 2S. Press the key once to adjust the gain quickly, so that the echo can be adjusted to a reasonable height.

24) There is a calendar clock display and when the echo map is stored, the time of saving the map is automatically recorded.

25) Distance (time) -gain increase function to increase the amplitude of distant echoes.

26) * With search sensitivity increase ON / OFF switch, you can quickly switch between search / quantity. The search sensitivity increase setting range is 0 ~ 20dB.

27) Suppression does not affect linearity.

28) With RS-232 communication port, after transmitting the recorded data to the PC, the report is output on the PC (the editing software is provided free of charge) and printed.

29) * There is a relative gain zero key, which can read the gain change directly. If it is used to express the attenuation, you can adjust the gain to the maximum first, and then press this key to see the relative gain value is the attenuation.

30) * When using an oblique probe, the interval scale can also display two rows of scale values ​​at the same time, which represent the horizontal component and the vertical component, respectively, without having to switch back and forth. Knowing the component values ​​in both directions can determine the location of the defect.

31) * Fast zero return function for sound path delay. Press the delay coding knob 0.6S, the delay amount will return to zero quickly.

32) * Curve position prompt function. If the DAC or AVG curve is not in the display area of ​​the display, after changing the gain, pitch and delay, it will prompt the curve position is too high or too left or too right. Determine the correct operation direction (only set this function in menu 7).

33) This unit uses large signal detection to improve linearity and extend dynamic range.

34) There are two thickness measurement modes (starting wave and bottom wave mode or bottom wave and bottom wave mode) to meet different thickness measurement requirements.

35) * Quick start, the flaw can be detected after pressing the power switch for 3S. After shutting down for 1S, you can turn it on again to return to the original state, so that you can extend the battery life by turning off the power during the detection interval.

36) In order to allow beginners to quickly grasp the basic knowledge of ultrasonic flaw detection, the special channel 0 simplifies the less commonly used functions and simplifies the operation of the instrument. Just enter 5 parameters on the menu 16 to test.

Instrument technical parameters