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AMERICAN STANDARD
16mm 3000-Cycle Flutter Test Film
Ktt. V3. Pal. Office
PH22.43-1953
(Revision of Z22.43-1946) •UDC 778.53
1. Scope and Purpose
1.1 This specification describes a 3000-cycle sound test film for use in determining the presence of flutter in 16mm sound motionpicture projectors.
2. Test Film
2.1 Recording. The test film shall have either an originally recorded, direct-playback positive variable-area sound track or an originally recorded variable-density sound track developed as a toe record. The recorded frequency shall be within ± 25 cycles of the nominal 3000-cycle frequency. The modulation of the recording shall be 80 ± 5%. The output level of the film shall be constant within ± 0.25 db. (This is equivalent to an amplitude tolerance of ± 0.0015 inch when recording variable-area sound track with a nominal amplitude of 0.055 inch.) The recording shall be accomplished in a recorder so constructed as to keep the flutter content to the absolute minimum consistent with the state of the art. The total rms flutter content of the film shall be less than 0.1% upon shipment by the test film manufacturer. The waveform distortion of the recording shall not exceed 5%.
2.2 Film Stock. The film stock used for the test film shall be cut and perforated in accordance with the American Standard Cutting and Perforating Dimensions for 16-Millimeter Sound Motion Picture Negative and Positive
Raw Stock, Z22. 12-1 947, or the latest revision thereof approved by the American Standards Association, Incorporated.
2.2.1 Resistance to Shrinkage. The film stock used for the test film shall have a maximum lengthwise shrinkage of 0.50% when tested as follows: At least 20 strips of film approximately 31 inches in length shall be cut for measurement of shrinkage. After normal development and drying (not over + 80 F (+26.7 C)), the strips shall be placed at least V* inch apart in racks and kept for 7 days in an oven maintained at + 120 F (+ 49 C) and a relative humidity of 20%. The strips shall then be removed, reconditioned thoroughly to 50% relative humidity at +70 F (+21.1 C), and the shrinkage measured by a suitable method. The percent shrinkage shall then be calculated on the basis of deviation from the nominal dimension for the length of 100 consecutive perforation intervals given in American Standard Z22.121947, or the latest revision thereof.
2.3 Standard Length of Film. The standard length of the flutter test film shall be 380 ft.
2.4 Leader and Trailer. Each test film shall be furnished with a suitable leader, title and trailer.
Note: A test film in accordance with this standard is available from the Society of Motion Picture and Television Engineers.
Approved October 26, 1953, by the American Standards Association, Incorporated Sponsor: Society of Motion Picture and Television Engineers
•Universal Decimal Clarification
Copyright 1953 by the American Standard* Association, Incorporated
Printed in U.S.A. ASAV&M10S3
Price, 25 Cents
656
November 1953 Journal of the SMPTE Vol. 61