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Turntable System Type 9640 consists of Controllable
Turntable Type 5960, Turntable Controller Type 5997
and Remote Control WB 1254. The Turntable System
is designed to rotate a test object, such as a loudspeaker, microphone, or hydrophone, for measurement of
directional response. Used in combination with a personal computer, Type 9640 becomes part of a system
capable of automatically recording the directional characteristics of many different test objects
Turntable Controller Type 5997 offers three modes of
operation (Turn_Rel, Turn_Abs and Cont.) and three commands Set 0°, Acc. and Max_360. Turn_Rel and
Turn_Abs allow a relative or absolute turn (specified in
degrees) to be made. When a polar plot of a single frequency is required, the CONT mode is to be selected as
it rotates the turnable continuously at a constant speed.