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Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Acoustics, Ultrasound, Vibration for Mexico (.PDF file)
Sound pressure level. Pistonphone, single frequency 250 Hz, 70 dB (reference: 20 µPa) to 130 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.09
Calibrated measurement microphone
Microphone type: LS1P
Internal NMI service identifier: CENAM/510-F012-003
 
Sound pressure level. Pistonphone or sound calibrator, single frequency 125 Hz to 1 kHz, 70 dB (reference: 20 µPa) to 130 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.11
Calibrated measurement microphone
Microphone type: LS2P
Internal NMI service identifier: CENAM/510-F012-003
 
Sound pressure level. Sound calibrator, single frequency 125 to 1 kHz, 70 dB (reference: 20 µPa) to 130 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.16
Calibrated measurement microphone
Microphone type: WS2P
Internal NMI service identifier: CENAM/510-F015-003
 
Sound pressure level. Sound calibrator, multi-frequency, 70 dB (reference: 20 µPa) to 115 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.16
Calibrated measurement microphone
Frequency: 125 Hz to 1 kHz
Microphone type: LS2P
Internal NMI service identifier: CENAM/510-F012-008
 
Sound pressure level. Sound calibrator, multi-frequency, 70 dB (reference: 20 µPa) to 115 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.21
Calibrated measurement microphone
Frequency: 31.5 Hz to 8 kHz
Microphone type: LS2P
Internal NMI service identifier: CENAM/510-F012-008