Figure 5-24. CRT Display Before Adjusting Sweep Delay

Figure 5-22. Relationship of CRT Sweep to Time Base

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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T.O. 33B-1-1 5-24 Figure 5-24. CRT Display Before Adjusting Sweep Delay. 5.2.1.3.8 Sweep Length/Range. The Sweep Length/Range control determines how much time/distance is represented by the sweep on the display. In Figure 5-25, if the Sweep Length/Range is adjusted to decrease the time/distance represented (that is, the sweep length/range), the spacing between the signals will increase, as seen in Figure 5-26. Note that the front surface signal did not move; only the distances between the front surface signal and the other signals increased. Referring back to Figure 5-23, the four-inch length of the test part and the one-inch depth of the discontinuity are represented by the signals in Figure 5-26 at “4” and “1” respectively. In other words, the Sweep Length/Range control is used to calibrate the time base to the test part using the horizontal scale on the display. Figure 5-25. CRT Display After Adjusting Sweep Delay. Figure 5-26. Effect of Sweep Length on CRT Display.

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