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Calibration <br />Certificate Number 2022001763 <br />Customer: <br />ESI Engineering Inc <br />Suite 218 <br />7831 Glenroy Road <br />Minneapolis, MN 55439, United States <br />Model Number 831 <br />Serial Number 0003553 <br />Test Results Pass <br />Certificate <br />Initial Condition AS RECEIVED same as shipped <br />Description Larson Davis Model 831 <br />Class 1 Sound Level Meter <br />Firmware Revision: 2.403 <br />Evaluation Method Tested with: <br />Larson Davis PRM831. S/N 029391 <br />Larson Davis CAL200. S/N 9079 <br />Larson Davis CAL291. S/N 0108 <br />PCB 377C20. S/N 315625 <br />Procedure Num6er <br />Technician <br />Calibration Date <br />Calibration Due <br />Temperature <br />Humidity <br />Stafic Pressure <br />D0001.8384 <br />Jacob Cannon <br />11 Feb 2022 <br />11 Feb 2023 <br />23.34 °C ± 0.25 °C <br />51.9 %RH ± 2.0 %RH <br />86.69 kPa ± 0.13 kPa <br />Data reported in d8 re 20 NPa. <br />Compliance Standards 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 17025:2017. <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 9001:2015. <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 - APCB PIEZOTRONICS DIV. ,,,,,�,,,,,, <br />.� � ,; <br />1681 West 820 North ' �i % <br />Provo, UT 84601, United States ,� �► LARSON DAVIS <br />%IE)-E>H4-OOOI ��i�n �; ACCREDITED. A i�O�� I)�\�15�(_)n <br />����/��I������� Cert.x3622.01 <br />2022-2-I1T09:43:30 Page 1 of 3 D0001.8406 Rev F <br />