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United States, NIST (National Institute of Standards and Technology)
Complete CMCs in Acoustics, Ultrasound, Vibration for United States (.PDF file)
Pressure sensitivity level. IEC 61094-1 type LS1Pn or LS1Po microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.08
Comparison with calibrated microphone used as sound source
Frequency: 0.05 kHz to 4 kHz
20 cm3 coupler filled with air up to 0.7 kHz, filled with hydrogen above 0.7 kHz
Approved on 05 November 2001
Internal NMI service identifier: NIST/25010C, NIST/25020C
 
Pressure sensitivity level. IEC 61094-1 type LS1Pn or LS1Po microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.09
Comparison with calibrated microphone used as sound source
Frequency: 4.001 kHz to 7 kHz
20 cm3 coupler filled with hydrogen
Approved on 05 November 2001
Internal NMI service identifier: NIST/25010C, NIST/25020C
 
Pressure sensitivity level. IEC 61094-1 type LS1Pn or LS1Po microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.26
Comparison with calibrated microphone used as sound source
Frequency: 7.001 kHz to 10 kHz
20 cm3 coupler filled with hydrogen
Approved on 05 November 2001
Internal NMI service identifier: NIST/25010C, NIST/25020C
 
Pressure sensitivity level. IEC 61094-1 type LS1Pn or LS1Po microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.17
Comparison with calibrated microphone used as sound source
Frequency: 10.001 kHz to 17 kHz
4 cm3 coupler filled with hydrogen
Approved on 05 November 2001
Internal NMI service identifier: NIST/25020C
 
Pressure sensitivity level. IEC 61094-1 type LS1Pn or LS1Po microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.32
Comparison with calibrated microphone used as sound source
Frequency: 17.001 kHz to 20 kHz
4 cm3 coupler filled with hydrogen
Approved on 05 November 2001
Internal NMI service identifier: NIST/25020C
 
Pressure sensitivity level. IEC 61094-1 type LS1Pn or LS1Po microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.04
Reciprocity in pressure field
Frequency: 0.05 kHz to 4 kHz
20 cm3 coupler filled with air up to 0.7 kHz, filled with hydrogen above 0.7 kHz
Approved on 05 November 2001
Internal NMI service identifier: NIST/25060S (microphone)
 
Pressure sensitivity level. IEC 61094-1 type LS1Pn or LS1Po microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.04
Reciprocity in pressure field
Frequency: 4.001 kHz to 7 kHz
20 cm3 coupler filled with hydrogen.
Approved on 05 November 2001
Internal NMI service identifier: NIST/25060S (microphone)
 
Pressure sensitivity level. IEC 61094-1 type LS1Pn or LS1Po microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.12
Reciprocity in pressure field
Frequency: 7.001 kHz to 10 kHz
20 cm3 coupler filled with hydrogen.
Approved on 05 November 2001
Internal NMI service identifier: NIST/25060S (microphone)
 
Pressure sensitivity level. IEC 61094-1 type LS1Pn or LS1Po microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.05
Reciprocity in pressure field
Frequency: 10.001 kHz to 17 kHz
4 cm3 coupler filled with hydrogen.
Approved on 05 November 2001
Internal NMI service identifier: NIST/25060S (microphone)
 
Pressure sensitivity level. IEC 61094-1 type LS1Pn or LS1Po microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.14
Reciprocity in pressure field
Frequency: 17.001 kHz to 20 kHz
4 cm3 coupler filled with hydrogen.
Approved on 05 November 2001
Internal NMI service identifier: NIST/25060S (microphone)
 
Free-field sensitivity level. IEC 61094-1 type LS2P or LS2F microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.21
Reciprocity in free field
Frequency: 2.5 kHz to 6.3 kHz
Free-field conditions in anechoic chamber.
Approved on 05 November 2001
Internal NMI service identifier: NIST/25050C
 
Free-field sensitivity level. IEC 61094-1 type LS2P or LS2F microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.15
Reciprocity in free field
Frequency: 6.301 kHz to 20 kHz
Free-field conditions in anechoic chamber.
Approved on 05 November 2001
Internal NMI service identifier: NIST/25050C
 
Sound pressure level. Sound calibrator, single-frequency (pistonphone). Nominal measurand range, 114 dB (reference: 20 µPa) to 124 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.09
Calibrated reference microphone
Frequency: 0.250 kHz
Approved on 05 November 2001
Internal NMI service identifier: NIST/25060S (pistonphone)
 
Sound pressure level. Sound calibrator, multi-frequency. Nominal measurand range, 74 dB (reference: 20 µPa) to 124 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.1
Calibrated reference microphone
Frequency: 0.125 kHz to 2 kHz
Approved on 05 November 2001
Internal NMI service identifier: NIST/25060S (sound calibrator)
 
Sound pressure level. Sound calibrator, multi-frequency. Nominal measurand range, 74 dB (reference: 20 µPa) to 124 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.2
Calibrated reference microphone
Frequency: 2.001 kHz to 4 kHz
Approved on 05 November 2001
Internal NMI service identifier: NIST/25060S (sound calibrator)
 
Charge sensitivity. Accelerometer (single ended). Measurand unit, C/(m/s2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1
Fringe counting
Frequency: 2 Hz to 160 Hz
Sinusoidal excitation.
Approved on 05 November 2001
Internal NMI service identifier: NIST/24010C
 
Charge sensitivity. Accelerometer (single ended). Measurand unit, C/(m/s2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 2
Comparison
Frequency: 10 Hz to 50 Hz
Sinusoidal excitation.
Approved on 05 November 2001
Internal NMI service identifier: NIST/24020C, NIST/24030C
 
Charge sensitivity. Accelerometer (single ended). Measurand unit, C/(m/s2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1
Comparison
Frequency: 51 Hz to 2 kHz
Sinusoidal excitation.
Approved on 05 November 2001
Internal NMI service identifier: NIST/24020C, NIST/24030C
 
Charge sensitivity. Accelerometer (single ended). Measurand unit, C/(m/s2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 2
Comparison
Frequency: 2.001 kHz to 3.5 kHz
Sinusoidal excitation.
Approved on 05 November 2001
Internal NMI service identifier: NIST/24020C
 
Charge sensitivity. Accelerometer (single ended). Measurand unit, C/(m/s2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 2
Comparison
Frequency: 2.001 kHz to 10 kHz
Sinusoidal excitation.
Approved on 05 November 2001
Internal NMI service identifier: NIST/24030C