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Calibration Certificate <br />Certificate Number 2017004807 <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 />Evaluation Method <br />Compliance Standards <br />Tested with: <br />Larson Davis PRM831. S/N 017139 <br />PCB 3771302. S/N 120629 <br />Larson Davis CAL200. S/N 9079 <br />Larson Davis CAL291. S/N 0203 <br />Procedure Number D0001.8384 <br />Technician Ron Harris <br />Calibration Date <br />9 May 2017 <br />Calibration Due <br />9 May 2018 <br />Temperature <br />23.89 °C ± 0.25 °C <br />Humidity <br />50.7 %RH ± 2.0 %RH <br />Static Pressure <br />85.85 kPa ± 0.13 kPa <br />Data reported in dB re 20 NPa. <br />Compliant to Manufacturer Specifications and the following standards when combined with <br />Calibration Certificate from procedure D0001.8378: <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. <br />Test points marked with a $ in the uncertainties column do not fall within this laboratory's 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 />For 1/4" microphones, the Larson Davis ADP024 1/4" to 1/2" adaptor is used with the calibrators and the Larson Davis ADP043 1/4" to <br />Larson Davis, a division of PCB Piezotronics, Inc ®LAR50N DAVIS <br />1681 West 820 North �`, <br />Provo, UT 84601, United States <br />AC REDITEDI A PCB PIEZOTRONICS DIV. <br />716-684-0001 Cert.#3622.01 <br />2017-5-9T14:42:42 Pagel of 3 D0001.8406 Rev B <br />