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"Rancang bangun sistem pengukuran impedansi listrik pada temperatur rendah telah dibuat dari temperatur -110˚C hingga temperatur kamar. Pengukuran impedansi listrik menggunakan RCL meter fluke PM6306 yang dapat dikontrol melalui program mikrokontroler. Sistem pendingin dirancang agar mampu mendinginkan bahan uji secara non-kontak dengan menggunakan nitrogen sebagai cairan pendingin. Sistem pendingin juga dilengkapi dengan pemanas yang dapat dikendalikan secara Proporsional hingga temperatur 30˚C. Pengukuran impedansi listrik dilakukan dengan dua metode yaitu pada temperatur konstan dan pada saat peningkatan temperatur. Dari kedua metode pengukuran ini diperoleh impedansi listrik sebagai fungsi frekuensi, Z(f), dan temperatur, Z(T). antar-muka menggunakan LABVIEW melalui program pengendalian temperatur. hasil pengukuran berupa temperatur, impedansi dan sudut phase otomatis tersimpan dalam komputer dan ditampilkan dalam grafik T(t), Z(f), Z(T) dan plot Nyquist.

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Low temperature system for electrical impedance measurement from -110˚C to room temperature has been made by using rcl meter fluke PM6306 controlled by microcontroller program. The cryostat was built to cool the sample without contact. Liquid nitrogen was used as liquid cooling. The cryostat also equipped by heater that can be controlled proportionally to heat up temperatur 30˚C. Impedance measurement can be carried out by two methods which are at constant temperature and during increasing temperature. From these methods, impedance as a function of frequency, Z(f), and as a function of temperature, Z(T), can be obtained. Interfacing was using labview through temperature controlling program. The results of measurement such as temperature, impedance, and its phase automatically recorded in computer and given in graphs T(t), Z(f), Z(T) and Nyquist plot. "

"ABSTRAKTelah dibuat SRC 3 fase dengan penyearah voltage doubler. SRC tersebut memiliki spesifikasi tegangan masukan 520VDC, tegangan keluaran 600VDC dan daya maksimum 2kW. SRC tersebut dikendalikan dengan algoritma kontrol soft start dan kontrol PI menggunakan mikrokontroler TMS320F28027. Pada pengujian secara open loop memiliki rentang error sebesar 2 hingga 2.2 . Pada pengujian secara close loop memiliki rentang error sebesar 7 hingga 9 .

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ABSTRACTThree phase series resonant converter with voltage doublers rectifier had been made. It had the spesification such as 520VDC input voltage, 600VDC output voltage and 2kW maximum power. The SRC controlled by microcontroller TMS320F28027 with soft start algorithm and PI controller. In opened loop testing, it has 2 until 2.2 of error. In the other hand, it has 7 until 9 of error when it tested in closed loop condition."