What is screen height linearity?
The screen height linearity is rarely an issue in modern instruments with digital display monitors and the 5% screen-height tolerance should be very easy to achieve even with the difficulties of maintaining coupling on the targets suggested by ASME. The Amplitude Control linearity assesses the amplifier performance.
How do I calibrate my UT machine?
Ultrasonic equipments used to develop weld or material flaw detection and sizing, need to be calibrated prior to the inspection, so one of the mandatory calibrations is the well known time base calibration that can be defined as the process developed to establish a correspondence between the time spend by the wave to …
What is vertical linearity in ultrasonic testing?
For the vertical linearity, bring the first echo to full screen height, and note that it is indeed 100% full screen height, then reduce the gain by 1dB and the amplitude should drop by an expected value.
How do you calibrate ultrasonic flaw?
The term “calibration” has come to be used for three different processes associated with ultrasonic flaw detectors: velocity/zero calibration, which must be performed whenever a new test material or transducer is being used, reference calibration, which is done to set up a test with respect to a reference standard, and …
How often should NDT equipment be calibrated?
Depending on their usage, you may have to calibrate equipment on a monthly, quarterly or semiannually basis. One way of achieving this is to use a circuit with known readings, a proprietary calibration card or check box.
What is the dead zone in ultrasound?
The dead zone is the distance between the front surface of the transducer and the echo of the first visible “near field” structure (Figure 1). The existence of the dead zone is caused, among other reasons, by the finite length of each emitted pulse.
Where is ultrasonic testing used?
In industrial applications, ultrasonic testing is widely used on metals, plastics, composites, and ceramics. The only common engineering materials that are not suitable for ultrasonic testing with conventional equipment are wood and paper products.
What should I do if my computer monitor is not the right height?
If your monitor isn’t the right height, move the monitor not your body. Strain and injury to your neck or shoulders can be avoided with products that alter monitor height. Monitor stands and risers save desk space and rise your screen to the correct viewing position. A stand also gives you an extra surface reducing the clutter from your desktop.
What does the linearity error in sensor mean?
Because the linearity error applies to the analog output of the sensing system, recognition must be given to other errors that can affect the output besides sensor non-linearity. To fully comprehend what the linearity error specification actually means, there are several pre-conditions that must apply to the measurement process.
How tall should my monitor be in relation to my eyes?
Monitor tips Adjust the monitor height so that the top of the screen is at—or slightly below—eye level. Your eyes should look slightly downward when viewing the middle of the screen. Position the monitor at least 20 inches (51 cm) from your eyes—about an arm’s length distance.
How does the availheight of the screen work?
More “Try it Yourself” examples below. The availHeight property returns the height of the user’s screen, in pixels, minus interface features like the Windows Taskbar. Tip: To get the width of the screen (excluding the Windows Taskbar), use the availWidth property.
