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Instrumentasi
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Instrumentasi is a scientific journal with high standard of papers that issued biannually by the Research Center for Metrology (Puslit KIM) – LIPI in cooperation with the Association of Instrumentation Society of Indonesia (HiMII). In its first years, Instrumentasi was categorized as a semi-popular magazine in the field of measuring techniques and measuring instruments which has been rapidly improved towards modern technology, and consequently, upgraded to a unique scientific journal in its class. Further, it is also accredited by the Indonesian Institute of Sciences (LIPI). 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.
Articles
57
Articles
Desain Akselerometer Menggunakan Mikrokontroler Arduino Due

Purwowibowo, Purwowibowo ( Puslit Metrologi LIPI ) , Prasasti, Ninuk Ragil ( Puslit Metrologi LIPI )

Instrumentasi Vol 41, No 1 (2017)
Publisher : LIPI Press, Anggota IKAPI

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Abstract

Pengembangan sistem pengukuran vibrasi memiliki dampak yang besar dalam sistem pengamatan kondisi dari jalan. Agar dapat memudahkan sistem pengamatan, maka dibutuhkan akselerometer yang terkalibrasi dan dikendalikan oleh mikrokontroler untuk merekam data vibrasi yang didapat dan disimpannya secara otomatis untuk mengevaluasi hasil dari perekaman. Pembuatan akselerometer ini menggunakan open source Arduino sebagai mikrokontroler sehingga sangat mudah untuk dibuat dan dikembangkan lebih lanjut untuk memajukan teknologi pengukuran vibrasi. Hasil pengukuran dari akselerometer ini langsung ditampilkan dalam layar LCD (Liquid Crystal Display) sehingga bisa dimonitor oleh pengamat.  Akselerometer yang dibuat memiliki rentang ukur sampai dengan 16 g dan prototipe akselerometer ini dikalibrasi menggunakan reference accelerometer B&K tipe 8305 nomor seri 1499872 dari Laboratorium Akustik dan Vibrasi Pusat Penelitian Metrologi-LIPI untuk rentang ukur sampai dengan 5 g dengan prosedur ISO 16063-21 sehingga nilai pengukurannya dapat terjamin kebenarannya. Hasil kalibrasi dalam rentang pengukuran sampai dengan 5 g dalam frekuensi sampai dengan 63 Hz menunjukan bahwa sensor akselerometer ini memiliki kemungkinan deviasi sampai 0.34g. Hasil perhitngan dan pengolahan data dari kalibrasi ini menghasilkan akurasi sebesar 98.4% pada frekuensi 31.5 Hz dan 40 Hz.

EFFECT OF STYLUS POSITION SHIFTINGS TO ECCENTRICITY AND ROUNDNESS VALUE IN GLASS HEMISPHERE MEASUREMENTS

Kartika, Nadya Larasati ( Research Center for Metrology-LIPI ) , Rahman, Ardi ( Research Center for Metrology-LIPI ) , Nugraha, Asep Ridwan ( Research Center for Metrology-LIP )

Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

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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.  

Measurement of Field Sound Transmission Loss of Blockwall Partition Between Two Rooms of a Tower in Jakarta

Palupi, Maharani Ratna ( Research Center for Metrology ) , Hermawanto, Denny ( Research Center for Metrology )

Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

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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.

THE MAIN PURPOSE FOR THE APPLICATION OF DOUBLE LAYER TIPPING BUCKET SENSORS IN RAINFALL MEASUREMENTS

Wijonarko, Sensus ( RCM-LIPI )

Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

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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.

PENGUJIAN KINERJA SERAPAN BUNYI PADA BAHAN KOMPOSIT DAUN JATI DENGAN METODE TABUNG IMPEDANSI

Hidayah, Qonitatul ( Department of Physics - Universitas Ahmad Dahlan )

Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

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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.

APPLICATION OF CIPM 2007 FORMULA AND ITS INFLUENCE IN DETERMINING UNCERTAINTY DUE TO VARIATION OF AIR DENSITY

Mushoddiqoh, Diina Qiyaman ( Research Center for Metrology LIPI ) , Eka, Nur Tjahyo ( Research Center for Metrology LIPI ) , Sugiharto, Toto ( Research Center for Metrology LIPI )

Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

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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.

DEVELOPMENT OF DIGITAL FLUOROSCOPIC PROTOTYPE FOR MANUFACTURING INDUSTRIES

Handoyo, Demon ( Centre for Nuclear Facility Engineering – BATAN ) , Cahyono, Agus ( Centre for Nuclear Facility Engineering – BATAN ) , Kurnianto, Kristedjo ( Centre for Nuclear Facility Engineering – BATAN ) , TS, Andeka ( Centre for Nuclear Facility Engineering – BATAN )

Instrumentasi Vol 41, No 2 (2017)
Publisher : LIPI Press, Anggota IKAPI

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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.

THE FUTURE OF POWER SEMICONDUCTOR DEVICES ROLE IN SMART GRID IMPLEMENTATION IN INDONESIA

Supono, I, Ardiatna, W

Instrumentasi Vol 39, No 2 (2015)
Publisher : LIPI Press, Anggota IKAPI

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Abstract

The use of power semiconductor devices as interfaces of distributed power generators in the smart grid is the key justification for the device advancement. It is the important forthcoming energy scheme for Indonesia to overcome the national electrical power shortage. The study of semiconductor devices focuses on their application in circuit breaker based on power semiconductor device, (solid-state circuit breaker/SSCB), which is a key element for the safety system in the smart grid scheme. An investigation on several devices in the market recommends a power semiconductor device type to be promoted in the near future for this specified application. The associated standardization infrastructure for the future of power device research, development and manufacturing in Indonesia is also presented. This paper presents the benefit of strengthening the role of power semiconductor devices in the electrical energy sector in Indonesia. It also shows that the IGCT will be the most promising device to be implemented in circuit breakers for transmission and distribution system.

PERBANDINGAN ANTARA METODE HIDROTERMAL DAN METODE PENGADUKAN UNTUK PEMBUATAN GOETHITE DENGAN PARAMETER KEMURNIAN

Kartika, Nadya Larasati, Nugroho, A. Agung

Instrumentasi Vol 39, No 2 (2015)
Publisher : LIPI Press, Anggota IKAPI

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Abstract

Struktur kristal goethite dapat berubah pada temperatur yang cukup rendah, seperti sedikit struktur hematite (α-Fe2O3) yang terbentuk pada temperatur 140oC. Pada penelitian ini, goethite (α-FeOOH) disintesis melalui dua metode, yaitu metode hidrotermal dan metode pengadukan. Hasil pengukuran difraksi X-ray dari kedua metode dibandingkan satu sama lain untuk mendapatkan metode sintesis yang paling optimal. Berdasarkan hasil fitting antara hasil pengukuran dan literatur melalui metode rietveld, metode pengadukan memiliki parameter kecocokan pola difraksi yang lebih baik dibandingkan metode hidrotermal. Metode pengadukan menghasilkan parameter GOF sebesar 3,8, sedangkan metode hidrotermal sebesar 122 akibat munculnya fase baru yang tumbuh, yaitu hematite (Fe2O3).

KETERSEDIAAN DAN KEBUTUHAN PERANGKAT UKUR NANO DI INSTITUSI PUSAT PENELITIAN ILMU PENGETAHUAN DAN TEKNOLOGI (PUSPIPTEK)

Febrian, Rizki, Nugraha, Asep Ridwan, Pusaka, Jimmy

Instrumentasi Vol 39, No 2 (2015)
Publisher : LIPI Press, Anggota IKAPI

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Abstract

Secara luas, terminologi nanoteknologi berarti bidang sains dan rekayasa material di dalam rentang ukur nanometer (10-9 meter). Di dalam rentang ukur tersebut bisa diamati properti dari material yang selama ini tidak diketahui dalam rentang mikrometer–nanometer (μm–nm). Oleh karena itu, perangkat-perangkat ukur yang akurat pun dibutuhkan. Survei dilakukan melalui kuesioner tentang perangkat ukur pada institusi yang ada di kawasan Puspiptek dan lembaga metrologi nasional di negara lain sebagai informasi pembanding. Perangkat ukur dengan jumlah penggunaan yang tinggi di Puspiptek adalah scanning electron microscopy (SEM) sebesar 39,24%, X-ray diffraction (XRD) sebesar 14,75%, dan transmission electron microscopy (TEM) sebesar 14,12%. Digunakan pada kegiatan rekayasa presisi, elektronik, optik, dan ilmu bahan, perangkat ukur ini memiliki standar acuan berupa reference material berdasarkan cara kerja perangkat ukur tersebut.