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Session:
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13P - Poster Session
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Date & Time:
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Wednesday August 9, 10:00 AM - 10:45 AM
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Paper Title:
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Setting up of acoustic standards and calibration facility at SCL
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Speaker:
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Aaron Yan, Engineer
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CoAuthors:
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W.K. Sin
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Speaker Info
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Company:
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SCL
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Department:
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LF
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Address:
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36/F., Immigration Tower
, 7 Gloucester Road Hong Kong, 11, Hong Kong SAR
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Phone:
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852-2829-4855
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Fax:
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852-2824-1302
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Email:
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ykyan@itc.gov.hk
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Abstract:
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The Government of The Hong Kong Special Administrative Region Standard and Calibration Laboratory (SCL) is the primary standards laboratory for Hong Kong. SCL has recently set up standards and calibration facility for acoustic measurements. The facility includes a primary calibration system for laboratory standard microphones, a calibration system for working microphones, a calibration system for sound calibrators and sound level meters. The calibration system for laboratory standard microphones is based on the primary calibration method of reciprocity as described in International Standard IEC 61094-2. The system is capable of calibrating one-inch laboratory standard microphones (63 Hz to 10 kHz) and half-inch laboratory standard microphones (63 Hz to 25 kHz). The measurement uncertainty of the system ranges from 0.04 dB to 0.14 dB. The calibration system for working microphones is based on the method of comparison in a coupler as described in International Standard IEC 61094-5. The calibration system for sound calibrators makes use of a calibrated laboratory standard microphone to measure the sound pressure level of a sound calibrator in accordance with International Standard IEC 60942. The calibration system for sound level meters measures the electrical as well as the acoustic responses of a sound level meter in accordance with International Standards IEC60651 and IEC 60804. All the calibration systems are highly automated to improve the quality of calibration and to increase the productivity. The laboratory has participated in a recent Asia Pacific Metrology Programme (APMP) key comparison on LS2P laboratory standard microphones APMP.AUV.A-K1. The preliminary comparison results showed that SCL's results agreed well with the reference values. SCL is in the process of developing other acoustic calibration services for audiometers and ear simulators.
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