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CHECKING SOUND TRACK DIMENSIONS 125
locating the film accurately with respect to the scanning beam, a guide should be placed where the scanning beam impinges on the film. On the other hand, the requirement of best film motion dictates that the guide shall be as far as possible from the point where the light beam impinges upon the film. It is for such reasons that the standards take the possibility of weave into account and have allowed for greater weave in sound projectors than in other machinery involved in the making and reproducing of 16-mm sound film.
The recommended width of a projector scanning beam is 0.071 in. The center line of this beam should be located 0.058 in. from the edge of the film, as described in Part 1. A quick qualitative check of a machine may be made by playing back an SMPE Buzz Track Test Film; this film has a tone of one frequency recorded beyond one limit of the sound track scanning beam, and a tone of different frequency recorded beyond the other limit of the sound track scanning beam. For measurement, however, the following procedure is suitable.
Checking the Projector Sound-Scanning Beam. The general method is to expose fine-grain positive film in the projector, develop the film, and to measure the track so produced. Obviously, all operations that involve exposing the film must be conducted in a dark room. Turn on the projector; run it without film for a few minutes. While it is running, extinguish all lights except the exciter lamp. The lights to be extinguished include all pilot lights, the picture projection lamp, etc. Shut off the machine. Wind approximately 100 ft. of fine-grain positive film on a reel in such a manner that when the reel is placed on the feed arm of the projector, the emulsion will face the screen. Make certain that the sound optics are correctly set for this emulsion position. Most machines do not provide an adjustment for nonstandard emulsion position films. Thread the projector. Turn on the amplifier so that the exciter lamp is lit. (If your machine is one of the older models that alters the brightness of the exciter lamp to effect volume control, set the volume control at the setting ordinarily used for ordinary blackand-white prints.) Run the film through the projector. After takeup, rewind the film on a core, wrap it, put it in a sealed film can, and send it to a film laboratory for development. An explanatory note should be sent with it explaining just what the film is and how it is to be developed. In most cases, developing at "standard" release print positive developing time will be satisfactory.
On the developed film, measure Z>5 from the edge of the film to the