The Model CAL291 is a dual channel Sound Calibrator. It is designed for measuring the residual intensity of sound intensity measurement systems. The following specifications apply: - When used with external signal generators the CAL291 Calibrator shall produce matched dual channel outputs of: ٠Sinusoids; Pink/White BB Noise. ٠1/3 Octave/White PRN.
Under IEC and ANSI standards, a sound intensity measuring system consists of a two microphone sound intensity probe and a dual channel processor. The accuracy of the intensity measurement is strongly dependent upon the phase accuracy between the two measurement channels, including the microphones. Sound intensity measurement systems are classified into Class 1 or 2 based upon the pressure-residual-intensity index which is measured using a residual intensity testing device. For direct calibration or verification of the accuracy of a sound intensity measurement system, IEC 1043 and ANSI S1.9 call for the use of a sound intensity calibrator which delivers to the probe microphones the simulated intensity at a specified temperature, atmospheric pressure and nominal microphone separation.
The Larson Davis Model CAL291 Residual Intensity Calibrator satisfies the residual intensity test device specifications of both IEC 1043:1993 and ANSI S1.9-1996.
Meets the residual intensity test device specifications as presented in IEC 1043:1993 “Instruments for the measurement of sound intensity” and ANSI S1.9-1996 “Instruments for the measurement of sound intensity”.
Impedance: 1 MW