T.O. 33B-1-15-77Figure 5-76. Impedance Plane Display of a Pitch/Catch Impulse Method.5.4.6.2.1The pitch/catch impulse probe is directionally sensitive such that both active tips must be over the same condition ofbond for unambiguous signal interpretation. For example, Figure 5-77 shows the proper way to align the active tips forprecise mapping of unbonds.Figure 5-77. Pitch/Catch Probe Positions for Mapping Unbonds.5.4.6.2.2Some pitch/catch instruments permit the operator to select the frequency, while in others the frequency is fixed.Typically, selectable frequencies range from 2.5 to 70 kHz; the frequency providing the largest received signal, due to
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