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Sound Level Meter Model: 820A Serial Number: A1584 <br />Certificate of A -Weight Electrical Conformance <br />This Type 1 Sound Level Meter (including attached PRM828 preamplifier and ADP005 18 pF input adapter) was <br />calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's A -weighted response <br />was then electrically tested using.a 1.8 Vrms sinewave at exact frequencies as specified in IEC 60651 (2001-10) <br />and ANSI S1.4-1983. <br />5.01 1- <br />0.0 <br />-5.0 <br />-10.0 <br />-15.0 <br />-20.0 <br />-25.0 <br />-30.0 <br />Level -35.0 <br />(dB) <br />-40.0 <br />-45.0 <br />-50.0 <br />-55.0 <br />-60.0 <br />-65.0 <br />-70.0 <br />-75.0 L <br />10 <br />31.6 100 316.2 1000 <br />Frequency (Hz) <br />3162.3 10000 31500 <br />Freq (Hz) <br />Theor <br />Measured <br />Error <br />Tolerance <br />Freq (Hz) <br />--------- <br />Theor <br />----- <br />Measured <br />-------- <br />Error <br />----- <br />Tolerance <br />---------- <br />--------- <br />10.00 <br />----- <br />-70.4 <br />-------- <br />-70.30 <br />----- <br />0.10 <br />---------- <br />+1.8, <br />-1.8 <br />630.96 <br />-1.9 <br />-1.90 <br />0.00 <br />+0.4, <br />-0.4 <br />12.59 <br />-63.4 <br />-63.40 <br />0.00 <br />+1.5, <br />-1.5 <br />794.33 <br />-0.8 <br />-0.90 <br />-0.10 <br />+0.4, <br />-0.4 <br />15.85 <br />-56.7 <br />-56.50 <br />0.20 <br />+1.2, <br />-1.2 <br />1000.00 <br />0.0 <br />0.00 <br />0.00 <br />+0.4, <br />-0.4 <br />19.95 <br />-50.5 <br />-50.50 <br />0.00 <br />+1.0, <br />-1.0 <br />1258.90 <br />0.6 <br />0.50 <br />-0.10 <br />+0.4, <br />-0.4 <br />25.12 <br />-44.7 <br />-44.60 <br />0.10 <br />+0.9, <br />-0.9 <br />1584.90 <br />1.0 <br />0.80 <br />-0.20 <br />+0.4, <br />-0.4 <br />31.62 <br />-39.4 <br />-39.50 <br />-0.10 <br />+0.7, <br />-0.7 <br />1995.30 <br />1.2 <br />1.10 <br />-0.10 <br />+0.4, <br />-0.4 <br />39.81 <br />-34.6 <br />-34.80 <br />-0.20 <br />+0.7, <br />-0.7 <br />2511.90 <br />1.3 <br />1.10 <br />-0.20 <br />+0.4, <br />-0.4 <br />50.12 <br />-30.2 <br />-30.20 <br />0.00 <br />+0.5, <br />-0.5 <br />3162.30 <br />1.2 <br />1.00 <br />-0.20 <br />+0.4, <br />-0.4 <br />63.10 <br />-26.2 <br />-26.20 <br />0.00 <br />+0.5, <br />-0.5 <br />3981.10 <br />1.0 <br />0.80 <br />-0.20 <br />+0.4, <br />-0.4 <br />79.43 <br />-22.5 <br />-22.70 <br />-0.20 <br />+0.5, <br />-0.5 <br />5011.90 <br />0.5 <br />0.30 <br />-0.20 <br />+0.5, <br />-0.5 <br />100.00 <br />-19.1 <br />-19.30 <br />-0.20 <br />+0.5, <br />-0.5 <br />6309.60 <br />-0.1 <br />-0.30 <br />-0.20 <br />+0.5, <br />-0.7 <br />125.89 <br />-16.1 <br />-16.00 <br />0.10 <br />+0.5, <br />-0.5 <br />7943.30 <br />-1.1 <br />-1.30 <br />-0.20 <br />+0.5, <br />-1.0 <br />158.49 <br />-13.4 <br />-13.30 <br />0.10 <br />+0.5, <br />-0.5 <br />10000.00 <br />-2.5 <br />-2.70 <br />-0.20 <br />+0.7, <br />-1.3 <br />199.53 <br />-10.9 <br />-10.90 <br />0.00 <br />+0.5, <br />-0.5 <br />12589.00 <br />-4.3 <br />-4.50 <br />-0.20 <br />+1.0, <br />-2.0 <br />251.19 <br />-8.6 <br />-8.80 <br />-0.20 <br />+0.5, <br />-0.5 <br />15849.00 <br />-6.6 <br />-6.90 <br />-0.30 <br />+1.0, <br />-7.4 <br />316.23 <br />-6.6 <br />-6.80 <br />-0.20 <br />+0.4, <br />-0.4 <br />19953.00 <br />-9.3 <br />-9.80 <br />-0.50 <br />+1.0, <br />-8.7 <br />398.11 <br />-4.8 <br />-4.90 <br />-0.10 <br />+0.4, <br />-0.4 <br />25119.00 <br />-12.4 <br />-13.00 <br />-0.60 <br />+3.5, <br />-9.6 <br />501.19 <br />-3.2 <br />-3.30 <br />-0.10 <br />+0.4, <br />-0.4 <br />31623.00 <br />-15.8 <br />-17.50 <br />-1.70 <br />+4.3, <br />-10.7 <br />This instrument is in compliance with IEC 60651 (2001-10) 6.1 and 9.2.2, ANSI S1.4-1983 5.1 and 8.2.1, and <br />IEC 60804 (2001-10) 5.1 for Type 1 sound level meters when used with a Larson Davis Type 1 microphone. <br />Technician: Sean Childs Test Date: 28AUG2017 <br />