This paper presents two methods for determining the complex antenna factor (CAF) of a shielded loop antenna for HF magnetic field measurements. A circuit model is introduced to apply the field-transferred 3-antenna method to double-loaded shielded loop antennas. In addition, a new 3-antenna method is proposed, where theoretical calculation and circuit measurement are combined. Experiments are made in an anechoic chamber in the frequency range of 50 MHz to 1000 MHz. The magnetic CAF of various shielded loop antennas can be determined by the proposed methods.

The paper deals with the measurement of harmonic magnitude and phase angle of a periodic voltage v(t) in power systems. The proposed procedure is based on Walsh spectrum measurement followed by digital computation to provide the Fourier spectrum of v(t) in magnitude and phase. Computer simulation results are presented to validate this method.

Sampling methods are nowadays commonly accepted for measurements of various signals and here we present our achievements in measurement of pure sine wave at low frequencies (up to about 500 Hz), that is, measurement of phase difference between two sinusoids. Firstly, we briefly discuss the mathematical form of samples and its implications on the calculations needed to determine the phase difference. We continue with deep explanations of an alghoritm for very accurate calculation of one parameter of the measured signals, the most important one for phase difference calculation. At the end, we present results of real laboratory measurements as the final proof of declared accuracy.

The two well known digital signals used in system identification are the squarewave and Pseudo Random Binary Sequence (PRBS) signals. In data measurement, symbols with the aid of the identification coding theorems are used to capture information using an identification channel. Previously signal engineering design techniques involving descriptive languages, symbolic codes, shift keyed symbols were used to design new sets of test signal, which were based on the squarewave. These symbols are used to form digital signals for narrowband or wideband multifrequency testing. In this paper, symbolic codes are used to simplify the description of PRBS signals. Phase shift keyed modulation is then used to design new band limited PRBS test signals using a 15 bit Maximum length (M) PRBS. In narrowband frequency response measurement, the bandwidth of these new PRBS signals may be adjusted with the aid of a zoom factor. A new approach to the symbolic description of these phase shift keyed signals is given. It simplifies the software production of these test signals from their measurement zoom codes.

This introduction to the Virtual Workshop presents the scope and recalls some related papers presented in the latest IMEKO World Congress in 2000. Links to relevant documents and files are also included. They are operative during the Workshop, some of them even later on.