Description

Modular Precision Sound Level Meter Type 2231 is a type 1 precision instrument with a wide range of measurement capabilities. It is convertible, a family of interchangeable modules enabling it to be used for numerous applications. The characteristics of the Sound Level Meter are determined by the module selected for use. The software contained in the module is loaded into the Sound Level Meter, defining the parameters that can be measured. In general, the Type 2231 performs simultaneously a number of mea¬surements on a signal. A unique feature is that Peak and RMS detection arc carried out in parallel, allowing each portion of the same signal to be viewed at the same time. A very wide frequency range of 2Hz to 70 kHz allows measurements in the infrasound and ultrasound regions. A number of Special Functions can be implemented with Type 2231, including automatic printout of data at the end of preset time periods. Also, a data inhibit function ensures that sound measurements incor¬porating time wise integration are not spoiled by spurious events. Since Type 2231 has a selectable polarization voltage, almost any mi¬crophone in the Bruel & Kjaer range may be used. With Microphone Type 4133 plus extension cable UA0027 it becomes a type 0 instru¬ment, in accordance with IEC 651 recommendations.