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Bulgaria, BIM (Bulgarian Institute of Metrology)
Complete CMCs in Acoustics, Ultrasound, Vibration for Bulgaria (.PDF file)
Pressure sensitivity level. Measurement microphone type LS1P. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.08
Pressure sequential comparison
Frequency: 63 Hz to 1 kHz
Approved on 18 October 2005
 
Pressure sensitivity level. Measurement microphone type LS1P. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.12
Pressure sequential comparison
Frequency: 1.25 kHz to 4 kHz
Approved on 18 October 2005
 
Pressure sensitivity level. Measurement microphone type LS1P. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.18
Pressure sequential comparison
Frequency: 5 kHz to 10 kHz
Approved on 18 October 2005
 
Pressure sensitivity level. Working standard microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.14
Pressure sequential comparison
Frequency: 63 Hz to 4 kHz
Approved on 18 October 2005
 
Pressure sensitivity level. Working standard microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.26
Pressure sequential comparison
Frequency: 5 kHz to 10 kHz
Approved on 18 October 2005
 
Free-field sensitivity level. Measurement microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.3
Sequential comparison
Frequency: 63 Hz to 4 kHz
Approved on 18 October 2005
 
Free-field sensitivity level. Measurement microphone. Measurand unit, dB (reference: 1 V/Pa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.5
Sequential comparison
Frequency: 5 kHz to 10 kHz
Approved on 18 October 2005
 
Sound pressure level. Sound calibrator, single frequency 160 Hz to 1000 Hz, 70 dB (reference: 20 µPa) to 125 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.1
Calibrated measurement microphone
Microphone type: LS1P
Approved on 18 October 2005
 
Sound pressure level. Sound calibrator, single frequency 160 Hz to 1000 Hz, 70 dB (reference: 20 µPa) to 125 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.15
Calibrated measurement microphone
Microphone type: WS2P
Approved on 18 October 2005
 
Sound pressure response level. Sound level meter, 94 dB (reference: 20 µPa) to 124 dB (reference: 20 µPa)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.2
Sound calibrator
Frequency: 1 kHz / 250 Hz
Approved on 18 October 2005
 
Free-field response level. Sound level meter. Measurand unit, dB (reference: true sound pressure level)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.4
Sequential comparison
Frequency: 63 Hz to 4 kHz
Approved on 18 October 2005
 
Free-field response level. Sound level meter. Measurand unit, dB (reference: true sound pressure level)
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 0.7
Sequential comparison
Frequency: 5 kHz to 10 kHz
Approved on 18 October 2005
 
Charge sensitivity (shock, modulus). Accelerometer. Measurand unit, C/(m/s2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 2.5
Comparison, ISO 16063-22
Peak value: 10 m/s2 to 2000 m/s2
Duration: 0.5 ms to 10 ms
Approved on 18 October 2005
 
Acceleration. Calibrator, 0.1 m/s2 to 1000 m/s2
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.5
Laser interferometry, ISO 16063-11
Frequency: 0.5 Hz to 1000 Hz
Approved on 18 October 2005
 
Acceleration. Calibrator, 0.1 m/s2 to 1000 m/s2
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1
Comparison, ISO 16063-21
Frequency: 5 Hz to 5 kHz
Approved on 18 October 2005
 
Acceleration. Calibrator, 1 m/s2 to 1000 m/s2
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 2
Comparison, ISO 16063-21
Frequency: 6.3 kHz to 10 kHz
Approved on 18 October 2005
 
Acceleration. Acceleration measuring instrument, 0.1 m/s2 to 1000 m/s2
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.5
Laser interferometry, ISO 16063-11
Frequency: 5 Hz to 1000 Hz
Approved on 18 October 2005
 
Acceleration. Acceleration measuring instrument, 0.1 m/s2 to 1000 m/s2
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1
Comparison, ISO 16063-21
Frequency: 5 Hz to 5 kHz
Approved on 18 October 2005
 
Acceleration. Acceleration measuring instrument, 1 m/s2 to 1000 m/s2
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 2
Comparison, ISO 16063-21
Frequency: 6.3 kHz to 10 kHz
Approved on 18 October 2005
 
Charge sensitivity (magnitude). Accelerometer. Measurand unit, C/(m/s2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.5
Laser interferometry, ISO 16063-11
Frequency: 5 Hz to 1000 Hz
Approved on 18 October 2005