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Certificate Number 2022001763 <br />1/2" adaptor is used with the preamplifier. <br />Calibration Check Frequency: 1000 Hz; Reference Sound Pressure Level: 114 d6 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 />Pattern approval for IEC 61672-1:2013 / ANSI/ASA S1.4-2014/Part 1 successfully completed by Physikalisch-Technische Bundesanstalt <br />(PTB) on 2016-02-24 certificate number DE-15-M-PTB-0056. <br />The sound level meter submitted for testing successfully completed the periodic tests of IEC 61672-3:2013 / ANSI/ASA S1.4-2014/Part <br />3, for the environmental conditions under which the tests were performed. As evidence was publicly available, from an independent <br />testing organization responsible for approving the results of pattern-evaluation tests performed in accordance with IEC 61672-2:2013 / <br />ANSI/ASA S1.4-2014/Part 2, to demonstrate that the model of sound level meter fully conformed to the class 1 specifications in IEC <br />61672-1:2013 / ANSI/ASA S1.4-2014/Part 1; the sound level meter submitted for testing conforms to the class 1specifications in IEC <br />61672-1:2013 / ANSI/ASA S1.4-2014/Part 1. <br />Description <br />Larson Davis CAL291 Residual Intensity Calibrator <br />Hart Scientific 2626-H Temperature Probe <br />Larson Davis CAL200 Acoustic Calibratar <br />Larson Davis Model 831 <br />PCB 377A13 1/2 inch Prepolarized Pressure Microphone <br />SRS DS360 Ultra Low Distortion Generator <br />Larson Davis 1/2" Preamplifier for Model 831 Type 1 <br />Standards Used <br />Cal Date <br />2021-09-10 <br />2021-02-04 <br />2021-07-21 <br />2021-03-02 <br />2021-03-03 <br />2021-04-13 <br />2021-09-28 <br />Cal Due <br />2022-09-10 <br />2022-08-04 <br />2022-07-21 <br />2022-03-02 <br />2022-03-03 <br />2022-04-13 <br />2022-09-28 <br />Acoustic Calibration <br />Measured according to IEC 61672-3:2013 10 and ANSI S1.4-2014 Part 3: 10 <br />Measurement <br />1000 Hz <br />Adjusted Level: 114.00 <br />As Received Level: 114.24 <br />114.00 <br />Lower Limit [dB] <br />113.80 <br />-- End of ineasurement results-- <br />114.20 <br />Loaded Circuit Sensitivity <br />Measurement Test Result Lower Limit Upper Limit <br />[dB re 1 V/ Pa] [dB re 1 V/ Pa] [dB re 1 V/ Pa] <br />1000 Hz -26.16 -27.82 -24.69 <br />-- End of ineasurement results-- <br />LARSON DAVIS - A PCB PIEZOTRONICS DIV. <br />1681 West 820 North <br />Provo, UT 84601, United States <br />716-684-0001 <br />Test Result [dB] <br />\,,,��,,,,,,,, <br />.. � ,; <br />� <br />�,, <br />��, �j�\ �r ACCREDITED� <br />'',���i^�,�' Cen.=36220t <br />Cal Standard <br />001250 <br />006767 <br />007027 <br />007182 <br />007185 <br />007635 <br />PCB0004783 <br />Upper Limit [dB] <br />Expanded <br />Uncertainty [dB] <br />0.14 <br />Expanded <br />Uncertainty [dB] <br />0.14 <br />Result <br />Pass <br />Result <br />Pass <br />�LARSON DAVIS <br />�.� �.�i: �; <br />2022-2-11T09:43:30 Page 2 of 3 <br />D0001.8406 Rev F <br />