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Calibration Certificate <br />Certificate Number 2017004790 <br />Customer: <br />LSA Associates Inc <br />20 Executive Park <br />Irvine, CA 92614, United States <br />Model Number 831 <br />Serial Number 0002441 <br />Test Results Pass <br />Initial Condition AS RECEIVED same as shipped <br />Description Larson Davis Model 831 <br />Class 1 Sound Level Meter <br />Firmware Revision: 2.311 <br />Procedure Number D0001.8378 <br />Technician <br />Ron Harris <br />Calibration Date <br />9 May 2017 <br />Calibration Due <br />9 May 2018 <br />Temperature <br />23.54 °C ± 0.25 °C <br />Humidity <br />49.4 %RH ± 2.0 %RH <br />Static Pressure <br />85.93 kPa ± 0.13 kPa <br />Evaluation Method Tested electrically using Larson Davis PRM831 S/N 017139 and a 12.0 pF capacitor to simulate <br />microphone capacitance. Data reported in dB re 20 NPa assuming a microphone sensitivity of 50.0 <br />mV/Pa. <br />Compliance Standards Compliant to Manufacturer Specifications and the following standards when combined with <br />Calibration Certificate from procedure D0001.8384: <br />IEC 60651:2001 Type 1 <br />IEC 60804:2000 Type 1 <br />IEC 61252:2002 <br />IEC 61260:2001 Class 1 <br />IEC 61672:2013 Class 1 <br />ANSI S1.4-2014 Class 1 <br />ANSI S1.4 (R2006) Type 1 <br />ANSI S1.11 (R2009) Class 1 <br />ANSI S1.25 (R2007) <br />ANSI S1.43 (R2007) Type 1 <br />Issuing lab certifies that the instrument described above meets or exceeds all specifications as stated in the referenced procedure <br />(unless otherwise noted). It has been calibrated using measurement standards traceable to the International System of Units (SI) <br />through the National Institute of Standards and Technology (NIST), or other national measurement institutes, and meets the <br />requirements of ISO/IEC 17025:2005. Test points marked with a $ in the uncertainties column do not fall within this laboratory's <br />scope of accreditation. <br />The quality system is registered to ISO 9001:2008. <br />This calibration is a direct comparison of the unit under test to the listed reference standards and did not involve any sampling plans to <br />complete. No allowance has been made for the instability of the test device due to use, time, etc. Such allowances would be made by <br />the customer as needed. <br />The uncertainties were computed in accordance with the ISO Guide to the Expression of Uncertainty in Measurement (GUM). A <br />coverage factor of approximately 2 sigma (k=2) has been applied to the standard uncertainty to express the expanded uncertainty at <br />approximately 95% confidence level. <br />This report may not be reproduced, except in full, unless permission for the publication of an approved abstract is obtained in writing <br />from the organization issuing this report. <br />Correction data from Larson Davis Model 831 Sound Level Meter Manual, 1831.01 Rev O, 2016-09-19 <br />Calibration Check Frequency: 1000 Hz; Reference Sound Pressure Level: 114 dB re 20 NPa; Reference Range: 0 dB gain <br />Periodic tests were performed in accordance with precedures from IEC 61672-3:2013 / ANSI/ASA S1.4-2014/Part3. <br />Larson Davis, a division of PCB Piezotronics, Inc ®LAR50N DAVIS <br />1681 West 820 North �, <br />Provo, UT 84601, United States <br />716-684-0001 '; ACCREDITED A PCB PIEZOTRONICS DIV. <br />Cert.#3622.01 <br />2017-5-9T12:09:20 Pagel of 24 D0001.8407 Rev B <br />