Figure 1-9a. Establishing a Field Indicator Reference Standard

Figure 1-9b. Checking In-Use Field Indicators

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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T.O. 33B-1-1 Figure 1-9a. Establishing a Field Indicator Reference Standard 1.6.14 Checking the In Use Field Indicators. (See Figure 1-9b.) a. Place a small bar magnet (approximately 1 by 1/2 inch) vertically near the bottom of an 8 1/2- by 11- inch sheet of paper and trace around the magnet with a marker. (It does not matter which pole of the magnet is up.) b. Place the field indicator reference standard on a sheet of paper with the bottom of the indicator above and in line with one pole of the magnet. Change 3 1-50.1/(1-50.2 Blank)

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