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6.5 Deflection and Distortion Measurement Precision:6.5.1 The means of measuring deflections of structural ribsbetween the reaction supports and movement of the ribs at thesupports shall provide readings within a tolerance of 60.01 in.(0.25 mm).6.5.2 The means of measuring pan distortion shall providereadings within a tolerance of 61⁄16 in. (1.5 mm).6.5.3 The means of measuring rib spread, when required,shall provide readings within a tolerance of 61⁄16 in. (1.5 mm).6.6 Reading Locations:6.6.1 Support deflection gages or measuring devices so thatreadings are not influenced by movements of, or within, thespecimen or member supports.6.6.2 Measure the maximum mid-span and span end (atanchor support) deflections of at least one structural rib notinfluenced by the attachment or seal to the test chamber.Additional locations for deflection measurements, if desired,shall be stated by the specifier of the test
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