TM 1-1520-265-23WARNINGElectrical equipment shall not be operated in areas where combustible gases or vapors may bepresent, unless the equipment is explosion-proof.a.If instrument is operated using AC power, use a grounded power cord.b.Turn power OFF before connecting or disconnecting transducer cable or power cable.1.4.12.2Ultrasonic Instrument Standardization. The ultrasonic instrument used in ultrasonic inspection proceduresdescribed throughout this manual is listed in Table 1-7. Reference blocks, instrument settings, and standardizationinstructions for the ultrasonic instrument are included in the individual ultrasonic inspection procedures. Because ofvaried circumstances under which the inspections may be performed, instrument settings, as they are given in thismanual, should be considered typical. Slight adjustment to the settings may be necessary to achieve the desired CRTpresentation. Illustrations representing typical CRT presentation will, in most cases, include reference signalsrepresenting initial pulse, transducer, and/or wedge echoes that have been moved off the scope to make room forrelevant indications. An effective ultrasonic inspection will depend largely upon the proper handling of the transducer;therefore, the following steps are recommended:a.Clean ultrasonic transducer with a low-lint cloth, MIL-C-85043 or equivalent. Clean all contact surfaces whenusing a wedge or delay block. Apply couplant to these contact surfaces and carefully tighten the assembly priorto test.NOTEScratches or similar surface blemishes remaining on the transducer or wedge may give falseindications.b.Use prescribed or equivalent couplant and in sufficient quantity to achieve proper coupling. The use of lubricantscontaining graphite, silicones, and glycerines is prohibited.c.Apply adequate pressure to keep transducer in contact with part.d.Use moderate speed for transducer search pattern. If transducer movement is too fast, a flaw could be passedover without a proper indication.1-36
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