TM 1-1520-264-23Figure 1-8. Typical Metal Sorting DisplayElectrical equipment shall not be operated in areas where combustible gases or vapors may be present,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.1.4.12.2 Ultrasonic 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:1-40
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