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.