3M BK4936, Version A: QE7052 manual Table A.41- Broad Band C Weighting

Page 30

Linear Operating Range

1/3 Octave Band

Table A.40(Continued)

IEC 651

Range 80 dB to 170 dB

	Frequency		SPL A Weighting
			Linear Operating Range (dB)
31.5		124		174
1000		83		173
4000		83		174
8000		84		174

IEC 804

Range 80 dB to 170 dB

		SPL A			LEQ A
	Weighting			Weighting
		Linear			Linear
Frequency	Operating			Operating
	Range (dB)			Range (dB)
4000	84		174	84		174

Table A.41- Broad Band C Weighting

Testing was performed using an 18pf input adapter under the following conditions: Reference level 114 dB @ 1 kHz, Reference Range 50 dB to 140 dB, Cal level 394.9 mV for testing level ranges – 20 dB to 70 dB through 50 dB to 140 dB. This represents a nominal sensitivity QE4936 microphone, 34.45 mV for testing level ranges 60 dB to 150 dB and 70 dB 160 dB this represents a nominal sensitivity QE-4110 microphone, 10.29 mV for testing level range 80 dB to 170 dB this represents a nominal sensitivity .

IEC 61672

Range -20 dB to 70 dB

			LEQ C
			Weighting
	SPL C Weighting		Linear
Frequency	Linear Operating		Operating
	Range (dB)		Range (dB)
31.5	26	75	26	75
1000	22	75	22	75
4000	24	74	24	74
8000	25	75	25	75
12500	29	75	29	75

Range -10 dB to 80 dB

			SPL C
		Weighting			LEQ C Weighting
Frequency		Linear Operating			Linear Operating
		Range (dB)			Range (dB)
31.5	25			85	25	85
1000	22			85	22	85
4000	24			84	23	84
8000	25			85	25	85
12500	29			85	29	85
		Range 0 dB to 90 dB
			SPL C
		Weighting			LEQ C Weighting
Frequency		Linear Operating			Linear Operating
		Range (dB)			Range (dB)
31.5	25			95	25	95
1000	22			95	22	95
4000	23			94	23	94
8000	25			95	25	95
12500	28			95	28	95

ANSI S1.4

Range -20 dB to 70 dB

		LEQ C Weighting
Frequency		Linear Operating Range
			(dB)
31.5	26			75
1000	23			75
4000	24			74
8000	26			75

Range -10 dB to 80 dB

	Frequency		LEQ C Weighting
			Linear Operating Range (dB)
31.5		25		85
1000		22		85
4000		24		84
8000		25		85
	Range 0 dB to 90 dB
	Frequency		LEQ C Weighting
			Linear Operating Range (dB)
31.5		25		95
1000		22		95
4000		24		94
8000		25		95

053-469 RevC

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