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MAINTENANCE OF SOUND EQUIPMENT 647
One other qualification is the possession of proper tools for his work. ( 5 ) A good workman never blames his tools because he knows the value of obtaining good ones. He knows that having the proper tools and keeping them in good shape is the only condition on which he can do good work. The projectionist is entitled to demand of the theatre the test equipment necessary to find trouble quickly and accurately. If such equipment is not supplied a broken wire may take two hours to find or sound quality continue consistently bad.
Instruments Used in Trouble-Shooting
(6) Perhaps the most necessary single instrument for trouble-shooting is a pair of good, high-resistance headphones. Next to these, and practically as indispensable, is a multiple-range combination voltmeter-milliammeter of good quality and high internal resistance.
Do not buy either cheap, low-resistance phones or cheap, low-resistance meters. They are not only useless for sound work, but may prove seriously dangerous to the apparatus because they pass too much current. Buy such equipment from a reliable source only and explain the purpose for which it is to be used.
A rectifier-type a. c. voltmeter and ammeter is likewise extremely useful. The same instrument can be used as an output or volume indicator. The supplier will provide a correction chart by means of which voltage readings of this meter can be converted into decibels, the units in which sound volume is commonly measured. Sound power can be expressed in either decibels or watts. (The decibel is usually chosen because it is the more convenient unit. Tn the same way water can be measured in quarts or in ounces, but it is generally more convenient to figure in quarts.)
The theatre should by all means have a reel, or at least loops, of test film. The reel is preferable, and lasts longer. Either reel or loops should contain sound recording of excellent quality for testing the system, and in addition pure-tone recordings of a number of frequencies. If disc is of importance in the theatre records of high quality