An experimental study about uncertainty in measurements of conducted emissions generated by a variable speed drive in the frequency band 150 kHz to 30 MHz due to variations in the power voltage, driving conditions and amplitude of torque applied to an electrical load is presented. A global index based on the weighted distance between measurements and standard limits is introduced to help to single out which factors have the largest influence on emissions. Results show that frequency of motor and torque applied to it can in fact cause relevant changes. One interesting takeaway is that when testing power drive systems for compliance to conducted emission standards, more specifications should be given about operating conditions in order to keep uncertainty related to test conditions at acceptable levels.

CC-LINK network and its communication method were researched to build a network remote measurement platform for the simulated loading experiment of the ship electric propulsion system. FR Series inverter controlled the marine electric propulsion motors and FX series Programmable Controller (PLC) controlled and monitored function stations in real time. The platform adopts the idea of field-bus control system. CC-LINK (Control and Communication Link), was a kind of the field-bus control system, which was communication medium of master station (FX series PLC) and slave stations (FX Series PLC& FR- A540 Series Inverters), the communication program was written based on ladder instruction. We realized control & measurement for the simulated loading experiment of the ship electric propulsion system. We also realized the collection and analysis of the data by network remote measurement platform.

This paper presents the results of a one year period survey of the 50 Hz magnetic fields in some dwellings and laboratories. By performing a great number of measurements, the authors considered the spatial and temporal variability. Thus, we determined the daily, weekly, monthly and annual variability of the magnetic field. We also made the time and frequency domain measurements of B, to characterize the harmonics contents of the residential magnetic field. This study is important in the field exposure estimation and the design of the power supply systems for the generated magnetic field reduction.

The paper presents the implementation of a low cost, small size portable measuring system based on a personal digital assistant (PDA) for heart rate and blood pressure variability evaluation. The signals obtained from electrocardiogram (ECG) electrodes and non-invasive arterial blood pressure (BP) sensors are pre-processed using a set of filters for noise reduction and acquired using two analogue channels of a data acquisition board. A distributed processing of ECG and BP acquired data is performed. In the most interesting configuration, the PDA does the data acquisition, display and data communication while the main part of data processing is performed in a host laptop PC. Data communication is performed under an ad-hoc wireless network (802.11g).

This paper presents a FIR adaptive filter to cancelling interference due to 50 Hz power line in human electroencephalographic (EEG) inspection. An overview of EEG techniques to study brain activity will be outlined. Then, the problem of spurious signal rejection, in this particular handset, shows the meaningfull application of adaptive filter structure. Poles of filter are driven to find an optimum bandwidth to eliminate noise. Least-Mean-Square (LMS) algorithm is used for adaptive process. Effect of finite filter length and non-zero response time, and their effect on time response will be also showed.