Title :
Digital Compensation Unit for Impedance Metrology
Author_Institution :
Fac. of Electr. Eng., Czech Tech. Univ., Prague
Abstract :
A two-channel compensation unit based on an application of a digital signal processor is described. This special device, having implemented the algorithm of the synchronous filtering, is used for the compensations of spurious voltages in the measurement set-up of the three-voltmeter method. The unit works in frequency range of 500 Hz-5 kHz. If the compensation unit is applied into the system, it has attained the level of residual spurious voltages about a few muVs. Thanks to this fact, the calibration of inductance standards in range 1mH-100mH can be made with the uncertainty less than 1 part in 104
Keywords :
calibration; digital signal processing chips; electric impedance measurement; measurement standards; measurement uncertainty; units (measurement); voltmeters; 0.5 to 5 kHz; digital compensation unit; digital signal processor; impedance metrology; inductance measurement; inductance standards; synchronous filtering; three-voltmeter method; two-channel compensation unit; Calibration; Digital signal processors; Filtering algorithms; Frequency; Impedance; Inductance; Metrology; Signal processing algorithms; Uncertainty; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2004 Conference on
Conference_Location :
London
Print_ISBN :
0-7803-8494-6
Electronic_ISBN :
0-7803-8494-6
DOI :
10.1109/CPEM.2004.305399
