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Sound in air

Working group 1.61

 

Calibration of microphones and sound calibrators

(Traceable to the german national reference)

I. Pressure sensitivity for measurement microphones according to IEC 61094-2, -4 , -5
Microphone types, e.g. Uncertainty
(1000 Hz)
Procedure Typical duration Frequency range
in Hz
B&K 4180, 4134, 4192
GRAS 40AG,
..........
0,1 dB  Comparison 5 days 125 - 16000
(17 frequencies)
0,06 dB (250 Hz) Reference to sound calibrator 5 days 250 and 1000
B&K 4144,
LD 2575
.......
0,1 dB Substitution 5 days 125 - 8000
(11 frequencies)
0,05 dB Reciprocity 4 weeks
(on request)
31,5 - 10000
(23 frequencies)
B&K 4136  0,12 dB Comparison 5 days 63 - 20000
(26 frequencies)
B&K 4160 0,03 dB Reciprocity 4 weeks
(on request)
31,5 - 10000
(23 frequencies)
B&K 4180 0,06 dB Reciprocity 4 weeks
(on request)
63 - 20000
(26 frequencies)
B&K 4134 0,06 dB Reciprocity 4 weeks
(on request)
63 - 20000
(20 frequencies)

On request, microphones can be calibrated at higher or lower frequencies.

II. Sound pressure level of sound calibrators
Type
Measurement uncertainty Measuring technique Typical test time Frequency range in Hz
Single frequency calibrator 0,05 dB - 0,2 dB with calibrated microphone 7 days 250 / 1000
Multifrequency calibrator 0,10 dB - 0,25 dB with calibrated microphone 7 days 16 - 16000

On request, sound calibrators can be calibrated at higher or lower frequencies.

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