Widyaningrum Indrasari, Widyaningrum
Universitas Negeri Jakarta

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Pembuatan prototipe sensor potensial listrik sebagai perangkat penunjang pada Receiver Controlled Source Electromagnetic Indrasari, Widyaningrum; U, Umiatin; Djamal, Mitra; Trihatmoko, Danang
Jurnal Spektra Vol 11, No 1 (2011): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Telah dilakukan pembuatan dan karakterisasi prototype sensor potensial listrik. Berdasarkan kalibrasi sensor potensial listrik X  terhadap kalibrator kesalahan absolut maksimum dan kesalahan relatif maksimum pada kenaikkan tegangan input kalibrator masing-masing yaitu mencapai 0,013 V - 0,0288V dan 0,21% - 0,41% pada daerah kerja 0,041V-0,05V. Kesalahan absolut maksimum dan  kesalahan relatif maksimum dengan penurunan tegangan input kalibrator masing-masing yaitu mencapai 0,011V-0,034V dan 0,025% - 0,034% pada daerah kerja 0,035V - 0,049V. Sensor potensial listrik yang diperoleh pada penelitian ini memenuhi syarat untuk  digunakan sebagai perangkat penunjang receiver Controlled Source Electromagnetic (CSEM). Kata kunci: Sensor potensial listrik, kalibrasi, CSEM, receiver.
PEMBUATAN DAN KARAKTERISASI DATA LOGGER PADA SISTEM DETEKSI PERANGKAT ELEKTROMAGNETIK INDUKSI Indrasari, Widyaningrum; Nanda, Rahmondia; Djamal, Mitra
Jurnal Spektra Vol 16, No 1 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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AbstrakTelah dilakukan pembuatan dan karakterisasi data logger sebagai perangkat akuisisi data digital pada sistem deteksi elektromagnetik induksi. Perangkat dibangun menggunakan ADC (Analog to Digital Converter) 16-bit dengan kecepatan 500 kilo samples per second (ksps). Untuk mengendalikan kerja ADC digunakan prosesor jenis mikrokontroler ATmega64A, sementara sebagai rangkaian pendukung kerja sistem digunakan multiplekser, rangkaian penguat, filter aktif lolos rendah Sallen Key tipe Butterworth, dan program antar muka. Sistem akuisisi data yang dibangun dapat merekam sinyal dengan frekuensi maksimum 10 kHz dari empat saluran masukan (channel). Rentang tegangan yang digunakan adalah ±2,5 Volt dengan resolusi ADC 76 µV, dan dapat mengakuisisi data setiap 2 µs. Hasil karakterisasi menggunakan input tegangan DC dari kalibrator diperoleh kurva keluaran ADC masing-masing channel mempunyai persamaan yang cukup identik dengan gradien sebesar 0,90. Sedangkan hasil karakteristik ADC terhadap sumber tegangan AC dari sensor magnetik fluxgate, menunjukkan adanya distorsi pada sinyal dengan frekuensi > 6 kHz.AbstractIt has been made and characterized data logger as a digital data acquisition devices on the electromagnetic induction detection system. This device was built using the ADC (Analog to Digital Converter) of 16-bit with the speed of 500 kilo samples per second (KSPS). The processors of microcontroller ATmega64A used as a controller of ADCs working. Several electronics circuits was used as a working supporting system, there are a multiplexer circuit, an amplifier circuit, an active low pass filter (Sallen-Key filter type Butterworth), and the interface program. Data acquisition system consists of four channels which is able to record the signal with a maximum frequency of 10 kHz. The working voltage range used is ± 2.5 Volts, with ADCs resolution of 76 μV, and able to obtain data every 2 μs. The characterization result of ADCs output using a DC voltage input from the calibrator, obtained that ADC output curve of each channel identical equation with a gradient of 0.90. Meanwhile the characterization result of ADCs output using the AC voltage source of fluxgate magnetic sensors, showed a distortion in a signal with a frequency > 6 kHz .Keywords: electromagnetic induction, data logger, ADC, resolution, fluxgate
THE EFFECT OF SETS LEARNING MODEL AND SCIENTIFIC ATTITUDE TOWARD STUDENT’S PHYSICS ACHIEVEMENT Amelia, Riski; Supriyati, Yetti; Indrasari, Widyaningrum
Unnes Science Education Journal Vol 8 No 3 (2019): December 2019
Publisher : Department of Integrated Science, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang in Collaboration with Perkumpulan Pendidikan IPA Indonesia

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The purpose of this study is determine the effect of science, environment, technology, and society (SETS) learning model and scientific attitude toward student’s physics achievement in XI grade student. This study was conducted at SMAN 2 Indramayu. This study used quasi experiment method with Two Way Anova design. There are 64 students as the sample and it was selected by purposive sampling. Students in experimental group learned through Science, Environment, Technology, and Society. Meanwhile, in control group, students learned through Inquiry Learning. The result of this study are: the student’s achievement given by Science, Environment, Technology and Society is higher than Inquiry; there is influence of interaction between learning models and scientific attitude toward student’s achievement; student’s achievement given by Science, Environment, Technology, and Society is higher than Inquiry in group of student’s with high scientific attitude; and student’s achievement given by Science, Environment, Technology, and Society is lower than Inquiry in group of student’s who have low scientific attitude.