Time aspects of virtual instrument designing

Abstract

A m : An approach to virtual instrumentution (VI) time analysis is presented. A problem of computational complerity from both, metrological und programming aspects is described. Tests with the basic LabVIEW functions were performed The verification of the approach, referring to the thorough virtual instrument tests and the time optimization process, is described.Some conclusions concerning the design of the Real-Time virtual instruments ore presented.

Methodology of virtual instruments' time analysis

“…To the examinations the BW02 virtual spectrum analyzer was selected [8]. Detailed results have been presented in [9] and [IO].…”

A Low-Cost Real-Time Virtual Spectrum Analyzer

“…The usable frequency band is proportional to 1/t proc . It is determined for every PC and DAQ card individually, with method presented in [1].…”

“…In practice only SRT conditions can be procured on the general purpose PC platform, as the limited ability to minimize t proc results in small frequency of analyzed signals. The time disturbances detected during examinations [1], [12] are common in such a configuration and have to be minimized. …”

“…Where funds are limited or many identical devices must be assembled, this solution is an optimal one. The disadvantage is the dependency of the application on the computer configuration it is deployed ( [1], [2]). Therefore time optimization is required, often giving increase of efficiency [2].…”

“…To make it as flexible as possible, National Instruments company [5] introduced the VIs working in the Real-Time (RT) mode. Considering this, the methods of the time analysis and design presented in [1] and [4] had to be revised. The paper presents the practical application of the former approach to the VI design.…”