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In the CMCs uncertainty statements, the notation Q[a, b] stands for the root-sum-square of the terms between brackets: Q[a, b] = [a 2 + b 2]1/2
Unless otherwise stated the expanded uncertainties given below correspond to k = 2 (at a 95 % level of confidence)
Ireland, NSAI NML (NSAI National Metrology Laboratory)
Sound calibrators ,
Sound pressure level
:
84 dB (reference: 20 µPa)
Sound calibrator, single frequency 1 kHz
Absolute expanded uncertainty
:
0.26 dB
Calibrated measurement microphone
Microphone type : WS2P (IEC 61094-4)
Approved on 31 March 2011
Institute service identifier : NMLI_A001
CMC ID :
EURAMET-AUV-IE-000005TS-1
Sound calibrators ,
Sound pressure level
:
124 dB (reference: 20 µPa)
Pistonphone, single frequency 250 Hz
Absolute expanded uncertainty
:
0.12 dB
Calibrated measurement microphone
Microphone type : WS2P (IEC 61094-4)
Approved on 31 March 2011
Institute service identifier : NMLI_A003
CMC ID :
EURAMET-AUV-IE-000005TU-1
Sound measuring instruments ,
Sound pressure response level
:
94 dB (reference: 20 µPa)
Sound level meter
Absolute expanded uncertainty
:
0.3 dB
IEC 61672-1, IEC 60651
Frequency : 125 Hz and 1 kHz
Approved on 31 March 2011
Institute service identifier : NMLI_A004
CMC ID :
EURAMET-AUV-IE-000005TV-1
Sound calibrators ,
Sound pressure level
:
94 dB (reference: 20 µPa) to 114 dB (reference: 20 µPa)
Sound calibrator, single frequency 1 kHz
Absolute expanded uncertainty
:
0.13 dB
Calibrated measurement microphone
Microphone type : WS2P (IEC 61094-4)
Approved on 31 March 2011
Institute service identifier : NMLI_A002
CMC ID :
EURAMET-AUV-IE-000005TT-1
