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| | | Mexico, CENAM (Centro Nacional de Metrologia) | | | Complete CMCs in Acoustics, Ultrasound, Vibration for Mexico (.PDF file)
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| 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 |
| | | Air-conduction response level. Audiometers. Measurand unit, dB HL (reference: threshold of hearing) | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.38 | | IEC60645-1 | | Frequency: 125 Hz to 8 kHz | | Internal NMI service identifier: CENAM/510-F016-001 |
| | | Bone-conduction response level. Audiometers. Measurand unit, dB HL (reference: threshold of hearing) | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.4 | | IEC60645-1 | | Frequency: 125 Hz to 4 kHz | | Internal NMI service identifier: CENAM/510-F016-001 |
| | | Mechanical impedance. Mechanical coupler system. Measurand unit, dB (reference: 1 N/(m/s) ) | | Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.2 | | Comparison IEC 60373 | | Frequency: 125 Hz to 4 kHz | | Internal NMI service identifier: CENAM/510-F012-011 |
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