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INDONESIA
Jurnal Instrumentasi
Published by Badan Standardisasi Nasional
ISSN : 01259202     EISSN : 24601462     DOI : 10.31153
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Chemistry Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology
The scientific areas covered by Instrumentasi are those backboned by scientific measurements and thus range from instrument engineering, metrology, testing, and control. All papers submitted are refereed by bona fide reviewers from leading research institutions as well as universities prior to publication to keep their quality meet the standard of the journal. The review is carried out mainly on the basis of originality, novelty, and contribution to scientific measurement. Authors need to complete the ethical clearance form for publication.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "Vol 41, No 2 (2017)" : 6 Documents clear
THE MAIN PURPOSE FOR THE APPLICATION OF DOUBLE LAYER TIPPING BUCKET SENSORS IN RAINFALL MEASUREMENTS Sensus Wijonarko
Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/instrumentasi.v41i2.114

Abstract

The aim of this study was to investigate the main purpose for the application of double layer tipping bucket sensors based on the existing double layer tipping bucket sensor in Tegal Climatological Station, Indonesian Agency for Meteorology, Climatology, and Geophysics. Hydraulic to electric analogy and rainfall interception models from Calder, Rutter, and Gash were used as the investigation method. The result showed that double layer tipping bucket sensors were dedicated to measure high intensity rainfalls.
Measurement of Field Sound Transmission Loss of Blockwall Partition Between Two Rooms of a Tower in Jakarta Maharani Ratna Palupi; Denny Hermawanto
Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/instrumentasi.v41i2.146

Abstract

A field sound transmission loss measurement to obtain the field sound transmission class (FSTC) from partition between spaces on 27th floor Tower "A" in Jakarta was conducted in April 1st, 2017. The measurement graph showed that, although the trend indicates an increase, but the graph shape like saw tooth shape indicates sound leakages. This measurement yielded 41 dB for the FSTC rating, which is considered far from the previous expectation, about 50 dB. After further analysis, the most dominant sound leakage was contributed by flanking noise via ducting works.Keywords: field sound transmission loss measurement, field sound transmission class, FSTC, sound leakage.
EFFECT OF STYLUS POSITION SHIFTINGS TO ECCENTRICITY AND ROUNDNESS VALUE IN GLASS HEMISPHERE MEASUREMENTS Kartika, Nadya Larasati; Rahman, Ardi; Nugraha, Asep Ridwan
Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/instrumentasi.v41i2.68

Abstract

In this research, the effect of stylus position shifting to eccentricity on hemisphere roundness measurement is examined in Research Center for Metrology LIPI (RCM-LIPI). The effect would give the acceptance eccentricity value for center adjustment of hemisphere. Least Square Circle (LSC) data fitting and Gaussian filtering were used in data processing. The result showed that until 3,3 µm shifting value with 3,23 µm in eccentricity the roundness values were constant. However, above this value, the roundness value starting to increase significantly and giving an uncertainty contribution to hemisphere measurement.  
PENGUJIAN KINERJA SERAPAN BUNYI PADA BAHAN KOMPOSIT DAUN JATI DENGAN METODE TABUNG IMPEDANSI Qonitatul Hidayah
Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/instrumentasi.v41i2.85

Abstract

Telah dilakukan pengujian kinerja serapan bunyi dari komposit daun jati berdasarkan komposisi massa bahan. Pengujian kinerja secara eksperimen dilakukan dengan menggunakan tabung impedansi dua mikrofon sesuai standar pengukuran ASTM E-1050-98. Dalam penelitian ini dilakukan 4 variasi komposisi massa bahan komposit daun jati. Variasi komposisi massa bahan tersebut dipress dengan tekanan 1 ton dan menghasilkan ketebalan yang berbeda. Masing-masing sampel komposit diuji dengan menambahkan air cavity 1 cm. Hasil penelitian menunjukkan bahwa kinerja serapan akustik terbaik terdapat pada model sampel D (t = 1,5 cm) dengan penambahan quarter wavelength resonator enam lubang dan air cavity 1 cm. Komposisi massa bahan mempengaruhi nilai koefisien serapan bunyi pada frekuensi medium dan tinggi. Penggunaan resonator dan air cavity efektif dalam meningkatkan kinerja serapan melalui mekanisme redaman viskous.
DEVELOPMENT OF DIGITAL FLUOROSCOPIC PROTOTYPE FOR MANUFACTURING INDUSTRIES Demon Handoyo; Agus Cahyono; Kristedjo Kurnianto; Andeka TS
Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/instrumentasi.v41i2.99

Abstract

Many X-ray applications in non-destructive testing have provided lots of benefits for manufacturing industries. A number of shortcomings of the use of film to capture images and the high-cost of digital radiography equipments make a low-cost equipment that can generate clean and clear images really expected. This paper describes the construction of such equipment. Based on the engineering principles, a prototype of digital fluoroscopy consisting of radioscopy box, belt conveyor, and controlling instrument, has been completed. The design employs fluorescent screen, mirror, and digital camera to record and transmit the images of test specimen to a computer for image processing. A LabView-based program has been built for conveyor control, camera control, and image recording, storing, and processing. Calibration and image enhancement processes have been applied to the images obtained. The success of the development of this equipment is represented by the highly clean and clear quality of the generated images.
APPLICATION OF CIPM 2007 FORMULA AND ITS INFLUENCE IN DETERMINING UNCERTAINTY DUE TO VARIATION OF AIR DENSITY Diina Qiyaman Mushoddiqoh; Nur Tjahyo Eka; Toto Sugiharto
Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/instrumentasi.v41i2.89

Abstract

Air density measurement is an important parameter in standard mass calibration. The value is calculated from four measured components : temperature, relative humidity, mole fraction of carbon dioxide, and air pressure of environment where the calibration takes place. Empirical formula to calculate air density is recommended by Comité International des Poids et mesures (CIPM) in 1981/91, then updated in 2007. In this paper, there will be explanation about the differences between CIPM 1981/91 formula and CIPM 2007, their applications to air density calculation and the effects to uncertainty budget, and uncertainty contribution from air density variation to the standard mass calibration. The data is taken from the environment condition in Mass Laboratory of RCM LIPI. From the calculation, the average air density obtained from CIPM 1981/91 formula is 0.0001 kg/m3 smaller than that obtained from CIPM 2007. Air density variation in the mass laboratory is calculated as 0.00572 kg/m3 for CIPM 1981/91 formula and 0.00566 kg/m3 for CIPM 2007. Very small difference makes it insignificant to the uncertainty budget. Uncertainty contribution to standard mass calibration for both formulas are relatively the same, about 0.031 kg/m3, with the sensitivity coefficient 3.0 x 10-06 m3, making it the third largest contributor to the uncertainty budget of mass calibration.

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