TY - JOUR N2 - An implemented impedance measuring instrument is described in this paper. The device uses a dsPIC (Digital Signal Peripheral Interface Controller) as a processing unit, and a DDS (Direct Digital Synthesizer) to stimulate the measurement circuit composed by the reference impedance and the unknown impedance. The voltages across the impedances are amplified by programmable gain instrumentation amplifiers and then digitized by analog to digital converters. The impedance is measured by applying a seven-parameter sine-fitting algorithm to estimate the sine signal parameters. The dsPIC communicates through RS-232 or USB with a computer, where the measurement results can be analyzed. The device also has an LCD to display the measurement results. L1 - http://www.czasopisma.pan.pl/Content/89762/PDF/Journal10178-VolumeXVIII%20Issue2_02paper.pdf L2 - http://www.czasopisma.pan.pl/Content/89762 PY - 2011 IS - No 2 EP - 198 DO - 10.2478/v10178-011-0002-0 KW - impedance measurement KW - dsPIC KW - ADC KW - sine-fitting A1 - Santos, José A1 - Ramos, Pedro PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation DA - 2011 T1 - DSPIC-Based Impedance Measuring Instrument SP - 185 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/89762 T2 - Metrology and Measurement Systems ER -