REALIZATION OF TOTAL HARMONIC DISTORTION MEASUREMENT OF ACOUSTIC SOURCE SIGNAL SYSTEM FOR FREQUENCY OF 125 HZ AND 1000 HZ

Bondan Dwisetyo, Denny Hermawanto, Dodi Rusjadi, Chery Chaen Putri, Maharani Ratna Palupi, Fajar Budi Utomo

Abstract

The measurement of total harmonic distortion (THD) of an acoustic source signal system has carried out in Laboratory Acoustics and Vibration, Sub-directorate of National Measurement Standards for Acoustics and Vibration - BSN. The aim of this research is, therefore, to measure and analize the THD values that produced by the system that consists of a signal generator, a power amplifier, and a passive loudspeaker with fundamental frequencies of 125 Hz and 1000 Hz. This measurement should be implemented because it has never been performed in this laboratory. Moreover, this system always be used for either calibration or measurement of acoustical instruments such as sound level meter and noise dosimeter. The method used to measure THD is a free field method using a full anechoic chamber with narrow band analysis. Measurand to determine THD is sound pressure level (SPL) with output of loudspeaker are 94 dB, 104 dB, and 114 dB. From result of measurement was found THD value of fundamental frequencies of 125 Hz and 1000 Hz. For the former frequency, the maximum THD was found at SPL of 94 dB where its value was 1,86 %. Meanwhile the later, the maximum value of THD was 1,94 % also at SPL 94 of dB. The results of this measurement can be used into uncertainty budget for either calibration or testing of acoustical instruments, and also support for validation of calibration of noise dosimeter based on percentage of noise exposure dose using acoustic comparison coupler that still under research and development in this year.

Keywords

acoustic source signal system, sound pressure level, total harmonic distortion (THD)

Full Text:

PDF

References

Alegria, F. C. (2016). Precision of the sinefitting-based total harmonic distortion estimator. Metrology and Measurement Systems, 23(1), 37-46.

Associated Power Technologies. (2011). Total harmonic distortion and effects in electrical power systems. Apt (Figure 1), 1–4. http://www.aspowertechnologies.com/resources/pdf/Total Harmonic Distortion. pdf.

Aswal, P., Singh, S. K., Agarwal, N., Sharma, V., & Sharma, G. (2016). Total harmonic distortion at fault in RLC load. Indonesian Journal of Electrical Engineering and Computer Science, 4(2), 325-332.

Corporation, Microsemi. (2015). Basic total harmonic distortion (THD). Measurement,30, 1–7.

Ginter, S. M., & Margolis, R. H. (2013). Acoustic method for calibration of audiometric bone vibrators. II. Harmonic distortion. The Journal of the Acoustical Society of America, 134(1), EL33-EL37.

Huszty, C., Yokoyama, S., & Sakamoto, S. (2010). Application of analytic sweep segments in room acoustic measurements. Red (Brownian), 6, 2.

IEC 60942. (2017). Sound calibrator. International Electroacoustics Commision.

IEC 61672-3. (2013). Electroacoustics-sound level meters-part 3: Periodic test. International Electroacoustics Commision.

Jaisiva, S, Neelan, S and Ilansezhian, T. (2016). Harmonic analysis in non – linear loads of power system.IRJET,3, 1474–78.

Kalibrasi, Sistem et al. (2014).Harmonisasi calibration system for evaluating a harmonic analyzer performance. 187–98.

Masunaga, S., Ikefuji, D., Morise, M., Nakayama, M., & Nishimura, T. (2012). Harmonic distortion measurement for a parametric loudspeaker with logarithmic time stretched pulse. Proc. Acoust, 12.

Meisami-asl, E., Sharifi, A., Mobli, H., Eyvani, A., & Alimardani, R. (2013). On-site measurement of soil moisture content using an acoustic system. Agricultural Engineering International: CIGR Journal, 15(4), 1-8.

Pollard, K. A., Tran, P. K., & Letowski, T. R. (2013). A free-field method to calibrate bone conduction transducers. The Journal of the Acoustical Society of America, 133(2), 858-865.

DOI: http://dx.doi.org/10.31153/js.v21i3.794