The research is devoted to investigate about the coordination in the time domain of the operations executed by the Measurement Instruments (MIs) connected by Hardware Interface (HI) to the node of the Distributed Measurement System. A new architecture of HI is proposed to trigger the MIs in order to (i) avoid the random effects of concurrency of the software processes running on PC, (ii) reduce the upper bound of the execution time of the procedure running on Real Time Operating System, and (iii) shorten the random time delay to detect the trigger condition, introduced by the polling cycle on the Programmable Logic Device (PLD). The proposed architecture of the HI includes the PLD as wireless interface, and the board designed to synchronize the trigger. It is equipped by PIC, Counter block, and Clk block. Experimental tests validate the HI pointed out and the proposed strategy to trigger the MIs in the synchronized modality.

Quantization errors like ADC errors and roundoff errors are similar in the sense that they are difficult to analyze and predict, and therefore need careful tests/measurements. This paper discusses the possibilities of the simulation of single-precision floating-point roundoff errors. It illustrates the examination of the error and discusses it in one of the most common signal processing procedures, the fast Fourier Transform. It shows a case when spurious spectral peaks appear due to roundoff error.

In this paper we develop an experimental analysis aimed at characterizing the shielding performance of shields operating in electromagnetic rail launchers. The experimental analysis is carried out for various shield configurations and different materials. In particular, cylindrical shell cylinders are adopted. The experiments are performed on a rail launcher prototype supplied by a high pulsed power device. Finally, we make some remarks on the measurement of the shielding effectiveness in such critical environments.

The frequency spectrum is a limited shared resource, nowadays interested by an ever growing number of different applications. Generally, the companies providing such services pay to the governments the right of using a limited portion of the spectrum, consequently they would be assured that the licensed radio spectrum resource is not interested by significant external interferences. At the same time, they have to guarantee that their devices make an efficient use of the spectrum and meet the electromagnetic compatibility regulations.
In this framework, the competent authorities are called to control the access to the spectrum adopting suitable management and monitoring policies, as well as the manufacturers have to periodically verify the correct working of their apparatuses. To these aims an innovative measurement method for spectrum monitoring and management is proposed in this paper. It performs an efficient sequential analysis based on a sample by sample digital processing. Three main issues are in particular pursued: (i) measurement performance comparable to that exhibited by other methods proposed in literature; (ii) fast measurement time, (iii) easy implementation on cost-effective digital signal processing hardware.

The precise selection of the input and sampling frequencies, and selection of the record length are very important for dynamic testing of AD converters and modules by sine wave signal. IEEE Std 1241-2000 and Std 1057-2007 provide standardization in the ADC testing. Selection of optimal input testing signal frequency under these standards is resolved separately for applied deterministic testing methods. To compare results between each test method, it is necessary to use identical test conditions inclusive of identical input testing signal frequency. That is why an algorithm of input testing signal frequency selection was developed to allow both the sine-fit and the DFT methods to be applied.