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166 CATALOG OF TEST FILMS Vol 49, No. 2
TEST FILM
CODE NO.
LENGTH (in Feet)
PRICE
35-Mm Transmission Test Film TA-1 250 $17.50
The Transmission Test Film is a print on safety stock and is used to check the position of the scanning beam, the electrical frequency response of the system, and flutter.
The film contains two sound tracks, one on each side of the film, which are printed head to tail thereby making rewinding unnecessary when playing both tracks.
The first track, entitled multifrequency test, starts with a short section of buzz track to check the guide-roller adjustment. Next is a series of the following constant frequencies: 1000, 40, 70, 130, 300, 500, 2000, 3000, 7000, and 8000 cps. The low frequencies are recorded at a reduced level and announcements precede all sections up to and including the 3000-cycle section. An unmodulated track of average density is included between the 7000 and 8000-cycle tones to evaluate the effect of film noise on the readings.
The second track, on the opposite side of the film, entitled flutter test, contains 60 ft of sustained piano chords followed by a 3000-cycle tone. While the flutter in this print is low, it is intended only as an aural check. For the bridge-type of flutter measurement, the toe-recorded variable-density negative (A3KC-1) should be used. 35-Mm Buzz-Track Test Film ABZT-1 50 min $0 . 04/f t
The Buzz-Track Test Film is a print on nitrate base and is used for checking scanning-beam placement. The track consists of an 0.087-in. opaque center with a frequency of 300 cycles on the picture side and a frequency of 1000 cycles on the sprocket side. These tracks are accurately located on the film so that when the film is run on a projector in correct adjustment and free from weave, no sound is heard. If the scanning-light beam is out of adjustment laterally, either the 300or the 1000-cycle tone will be heard.
This film is available in 50 to 500-ft lengths in multiples of 50 ft. 35-Mm Scanning-Beani Illumination Test Film
Type ,4— 17-Position Track A17P-1 230 $12.50
Type B— Snake Track AST8-1 8 0.50
The Scanning-Beam Illumination Test Film is a print on nitrate base and is used to check the uniformity of illumination across the scanning slit.
Type A (17-Position Track) is used by manufacturers or on new installations. The film contains 17 incremental 1000-cycle tracks, all with the same amplitude of approximately 0.007 in. The tracks appear on the film in succession, each preceded by an announcement identifying the track number. The 17 tracks cover a width greater than the standard scanning beam. By running this test film and observing the indications of the output meter it is possible to correct unevenness of illumination and bring the variation of output within a limit of Z 1.5 db, which is the recommended maximum variation. This is accomplished by adjusting or replacing the exciter lamp.
A calibration sheet giving the exact position of each track from the guided edge is provided with each film.