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National standard of the unit of sound pressure in air medium in the frequency range from 20 Hz to 20 kHz

The standard is produced and is in operation since 2003

Standard composition:

  • A set of converters of sound pressure:

a set of priming caps of laboratory standard microphones of 4160 and 4180 types;
a set of priming caps of working standard microphones of 4192 and 4145 types

  • A set of electronic equipment:

microphone preamplifiers (types 2673 and 2669); power-supply unit, microphone acoustic calibrators (types 4228 and 4226); two-channel microphone power supply unit of 5935 L type; two-channel microphone conditioning intensifier of 2690А-OSI type; signal generator of DS360 type; digital multimeter HP 3458A; electrometer «Keithley 6517A»

  • A set of acoustic chambers of connection

Metrological characteristics:

  • graduation error on pressure of standard microphones (working and laboratory) by means of comparison in the comparator (closed communication device) within the range of frequencies 63 Hz - 1 kHz does not exceed 0,2 dB; graduation error on pressure of working standard microphones by means of electrostatic actuator, with reference to absolute sensitivity of the microphone on the reference frequency by means of comparison with laboratory standard microphones in the closed communication device, within the frequency range of 20 Hz - 20 kHz does not exceed 0,4 dB
  • The value of the expanded uncertainty of measurement of sensitivity range according to pressure of the standard microphones within the frequency range of 63 Hz - 1 kHz: type LS1 and WS1 does not exceed 0,1 dB;
  • type LS2 and WS2 does not exceed 0, 12 dB.
  • The value of the expanded uncertainty of measurement of the level of sound pressure of acoustic calibrators of sound at one frequency within the frequency range 125 Hz - 1 kHz with the use of standard microphones: LS1Р type does not exceed 0,1 dB; LS1Р type does not exceed 0,1 dB; LS2Р and WS1Р type does not exceed 0,12 dB; WS2Р type does not exceed 0,16 dB.

BelGIM calibration and measurement capabilities (СМС) in the field of acoustics are included into Attachment С KCDB and are published on International Bureau of Weights and Measures website.

Sources of traceability:

Russia, FSUE «All-Russian Research Institute of Physicotechnical and Radiotechnical Measurements», State primary standard of the unit of sound pressure (Pa) in air medium (GET 19-94)

Scope of application:

  • metrological control of acoustic measurement instruments, tests, metrological attestation, verification, calibration; acoustic measurements in the branches of national economy and public health;
  • regional metrological centers of Gosstandart; accredited testing centres;
  • services for labour protection and safety techniques; services of sanitary epidemiological surveillance; scientific subdivisions of the National Academy of Sciences of Belarus

Refitted in 2006 – 2008.

 

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