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Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Length for Mexico (.PDF file)
Laser radiations. Stabilized laser of the mise en pratique: absolute frequency, 474 THz
Absolute expanded uncertainty (k = 2, level of confidence 95%) in kHz: 24
Optical beat frequency
Internal NMI service identifier: CENAM/1
 
Laser radiations. Other stabilized laser: vacuum wavelength , 633 nm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: 2E-09
Optical beat frequency
Internal NMI service identifier: CENAM/2
 
Pressure sensitivity level. Measurement microphone type LS2. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.2
Pressure reciprocity IEC 1094-2:1992
Frequency: 20 kHz
Internal NMI service identifier: CENAM/510-F013-001
 
Pressure sensitivity level. Measurement microphone type LS2. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.11
Substitution IEC 1094-5
Frequency: 250 Hz
Internal NMI service identifier: CENAM/510-F012-002
 
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
 
Sound pressure response level. Sound level meters. Measurand unit, dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.3
Comparison IEC651 and IEC804
Frequency: 250 Hz to 1 kHz
Internal NMI service identifier: CENAM/510-F015-001
 
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
 
Force response level. Mechanical coupler system. Measurand unit, dB (reference: reference equivalent threshold force)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.3
Comparison IEC 60373
Frequency: 125 Hz to 4 kHz
Internal NMI service identifier: CENAM/510-F012-011
 
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
 
Charge sensitivity (phase shift). Accelerometer, 0 ° to 360 °
Absolute expanded uncertainty (k = 2, level of confidence 95%) in °: 2
Laser interferometry ISO 16063-11
Frequency: 50 Hz to 5 kHz
Sinusoidal excitation
Internal NMI service identifier: CENAM/510-F011-001
 
Voltage sensitivity (phase shift). Acceleration measuring chain, 0 ° to 360 °
Absolute expanded uncertainty (k = 2, level of confidence 95%) in °: 2
Laser interferometry ISO 16063-11
Frequency: 50 Hz to 5 kHz
Sinusoidal excitation
Internal NMI service identifier: CENAM/510-F011-001
 
Pressure sensitivity level. Measurement microphone type LS1. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.04
Pressure reciprocity IEC 1094-2:1992
Frequency: 31.5 Hz to 250 Hz
Internal NMI service identifier: CENAM/510-F013-001
 
Pressure sensitivity level. Measurement microphone type LS1. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.03
Pressure reciprocity IEC 1094-2:1992
Frequency: 500 Hz to 3.1 kHz
Internal NMI service identifier: CENAM/510-F013-001
 
Pressure sensitivity level. Measurement microphone type LS1. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.05
Pressure reciprocity IEC 1094-2:1992
Frequency: 4 kHz to 5 kHz
Internal NMI service identifier: CENAM/510-F013-001
 
Pressure sensitivity level. Measurement microphone type LS1. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95%) in dB: 0.06
Pressure reciprocity IEC 1094-2:1992
Frequency: 6.3 kHz
Internal NMI service identifier: CENAM/510-F013-001