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Proposed American Standard
16mm Motion Picture Projector
For Use With Monochrome Television Film
Chains Operating on Full-Storage Basis
(Fourth Draft)
PH22.91
17.4 Adjustment of Scanning Beam.
17.4.1 Lateral Adjustment. Means shall be provided for adjusting the lateral position of the scanning beam such that the projector does not reproduce either signal on a buzz-track test film complying with the requirements of American Standard Z22.57-1947.
17.4.2 Azimuth Adjustment.
17.4.2.1 Means shall be provided for adjusting the azimuth of the scanning beam.
17.4.2.2 The azimuth shall be adjusted to secure maximum response using a 7000cycle test film complying with the requirements of American Standard Z22.42-1946.
17.4.3 Focus Adjustment.
1 7.4.3.1 Means shall be provided for adjusting the focus of the sound optics to place the plane of optimum focus in coincidence with the emulsion plane.
17.4.3.2 Focus shall beadjusted to secure maximum response using a test film complying with the requirements of American Standard Z22.421946.
1 7.4.3.3 Means shall be provided for rapidly and accurately shifting the plane of optimum focus to coincide with the emulsion position on either side of the film.
1 7.5 Light Distribution. The light distribution in the scanning aperture shall be sufficiently uniform to produce a signal across a resistive
P. 6 of S pp.
load at the output of the preamplifier which is constant within ± 1.5 db when reproducing a Scanning Beam Uniformity Test Film complying with the requirements of American Standard Z22.80-1950 or Z22.81-1950. 17.6 Exciter Lamp.
17.6.1 The exciter lamp shall be so mounted as to permit rapid replacement.
17.6.2 It is not desirable that uniformity of illumination in the scanning aperture be critically dependent upon exciter lamp position. If this condition exists, means shall be provided for independent horizontal and vertical adjustment of the exciter lamp position.
17.6.3 The exciter lamp shall be a prefocused type unless the lamp holder is a replaceable type equipped with adequate adjustments which can be preset, and a spare lamp holder is provided.
1 7.6.4 The exciter lamp shall be operated at all times within any applicable ratings established by the manufacturer of the lamp.
18. Sound Amplification System
Any statement of sound-reproduction characteristics must necessarily cover the performance of a preamplifier which is specifically designed as a component of the projector. However, it is not essential that all or even any part of the preamplifier be included in the projector structure. Wherever they are mounted, all parts of the preamplifier should be readily accessible.
18.1 Output Impedance. There shall be available output impedances of 600 and 150 ohms, both to be balanced outputs.
NOT APPROVED
150
August 1952 Journal of the SMPTE Vol. 59