линейность по высоте экрана

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Note added at 55 mins (2020-01-12 18:27:11 GMT)
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his Mandatory Appendix provides requirements for
checking screen height linearity and is applicable to ultrasonic instruments with A-scan displays.
I-440 MISCELLANEOUS REQUIREMENTS
Position an angle beam search unit on a calibration
block, as shown in Figure I-440 so that indications from
both the 1/2 and 3/4T holes give a 2:1 ratio of amplitudes between
the two indications. Adjust the sensitivity (gain) so
that the larger indication is set at 80% of full screen height (FSH).
http://www.ndt.net/forum/thread.php?msgID=73272

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Note added at 1 hr (2020-01-12 18:57:58 GMT)
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Screen Height Linearity - The ultrasonic instrument should provide linear vertical presentation within ± 5 percent of the full screen height
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