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The generator noise level 9101/ HD HD 9102 is a portable, battery-powered sound source, suitable for calibration of sound level meters ( portable and laboratory) and acoustic measuring stations. And â possible to calibrate directly microphones 1 / 2 â of mechanical dimensions conform to the requirements of IEC 61094-1 ( â Measurement Microphones, Part 1: Specifications for Laboratory Standard Microphonesâ ) and IEC 61094-4 ( â Measurement Microphones. Part 4: Specifications for working Standard Microphones) ADVANTAGES OF CALIBRATORS HD 9101 / HD 9102 ARE: - With the frequency of the sound signal at 1000Hz can perform calibration of sound level meters with any frequency weighting ( LIN, A, B, ...) , without introducing correction factors. - The sound pressure level generated is independent of atmospheric pressure is therefore not necessary to correct the value function of atmospheric pressure. - The calibrator 9101/ HD HD 9102 can be conveniently used in both laboratory and field. - Ease of use allows the use even by unskilled personnel. TECHNICAL SPECIFICATIONS The calibrator HD9101 satisfies Class 1 specifications according to the standard IEC 60942-1988 and complies with the requirements of the standard ANSI S1.40-1984. The calibrator HD9102 satisfies Class 2 specifications according to the standard IEC 60942-1988 and complies with the requirements of the standard ANSI S1.40-1984. - Diameter of microphones that may be calibrated: 23.77 ± 0.05 mm 1â 12.7 ± 0.03 mm 1/ 2â ( with 1/ 2â adapter mod. 9101040) standard according to IEC 61094-1 and IEC 61094-4 - Stabilization time: 60 sec - Frequency HD 9101: 1000Hz ± 2% - Frequency HD 9102: 1000Hz ± 4% - Sound pressure level HD 9101: 94db/ 114dB ± 0.3dB - Sound pressure level HD 9102: 94db/ 114dB ± 0.5dB ( ref.101.3kPa, 23° C ± 3° C and 65% RH) - Total distortion: