Prediction of system-level emissions performance via equipment shelf primary power bus frequency response characteristics
This paper reports an interesting extension of the frequency response testing technique to characterize real-world EMC conditions as encountered in the Product Realization cycle. It is demonstrated that the behavior of the Primary Power Bus of a system Equipment Shelf is a reliable predictor of the system’s EMC performance. In particular, the Conducted and Radiated Emissions characteristics of the system are anticipated before the system is fully assembled, and long before System-Level formal compliance testing is done. The frequency pass-bands and resonances of the Primary Power Bus are identified and these outcomes are closely correlated with independently obtained Conducted and Radiated Emissions spectra for the populated system Equipment Shelf.
Sensitivity of frequency-swept shielding effectiveness measurements to reflecting surfaces and EMI noise in the test area
This paper reports and compares empirical outcomes of frequency-swept Shielding Effectiveness (ES) measurements for several types of metallic enclosures, performed under two extreme conditions. In one case, the test is done in an area with numerous metallic surfaces and objects, while in the other case reflecting surfaces or objects are practically nonexistent. It is demonstrated that the frequency-swept data obtained from the two cases are well correlated, and that the existence of reflecting surfaces in the test area does not appear to be a significant source of error. These outcomes suggests that the frequency-swept method offers a quick and inexpensive method of measuring the effective SE of enclosures even in the presence of reflecting surfaces, large metal objects and EM noise from other equipment.
EL TRATAMIENTO NEOPRAGMATISTA DE LA VERDAD EN RICHARD RORTY NEOPRAGMATIST TREATMENT OF TRUTH IN RICHARD RORTY
Richard Rorty, one of the most influential authors of our time, presents a critique of the philosophical concept of truth as correspondence. The conclusion of Rorty's neopragmatism is that the idea of truth as correspondence between language and facts is ineffective because it no longer works. The neopragmatist conception of truth indicates the only possible uses for the term «truthful,» revolving around the idea of jus - tification. In this article, the neopragmatist notion of truth is presented in order to