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April, 1946
AMERICAN STANDARDS ON MOTION PICTURES
295
American Standard Specifications for
3000-Cycle FlutterTestFilm
for 1 6-Millimeter Sound Motion Picture Projectors
Reg. V. S. Pat. Off.
Z22.43-1946
1. Scope and Purpose
1.1 This specification describes a 3000-cycle sound test film for use in determining the presence of flutter in 16-mm sound motion picture 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 =b 5 percent. The output level of the film shall be constant within it !4 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 percent upon shipment by the test film manufacturer. The wave-form distortion of the recording shall not exceed 5 percent.
2.2 Film Stock. The film stock used for the test film shall be cut and perforated in accordance with the American Standard 16Mm Sound Motion Picture Film; Cutting and Perforating for Negative and Positive Raw Stock, Z22.12-1941, or latest revision thereof.
2.2.1 Resistance to Shrinkage. The
film stock used for the test film shall have a maximum lengthwise shrinkage of 0.50 percent 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 +80F [+26.7C]), the strips shall be placed at least V* inch apart in racks and kept for seven days in an oven maintained at -f 1 20 F (+ 49 C) and a relative humidity of 20 percent. The strips shall then be removed, reconditioned thoroughly to 50 percent relative humidity at +70F (+21.1 C), and the shrinkage measured by an adaptation of the pin-gage method outlined in Research Paper RP-1051 of the National Bureau of Standards. 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. 12-1 941, or latest revision thereof.
2.3 Standard Length of Film. The
standard length of the flutter test film shall be 380 feet.
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 Engineers.