A rapid method for measuring the transfer impedance of connectors

In power plants and other complex industrial application fields, incomprehensive design can make the system less durable. The fault of the fieldbus, in principle, comes from the physical layer, whose lay-out directly affects the fieldbus’s reliability. This article discusses from four aspects on how to improve the reliability of the physical layer of CAN bus, which include the selection of cables and connectors, the length of the bus and branch lines, the matching method of terminal resistor, and the interface circuit of hardware. Furthermore, the article presents the plan of using H-bridge type matching terminal, which aims at solving signal-reflection problems. Finally, the theory is verified through the application of intelligent electric actuator with the CAN bus.

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“…In practical applications, the following empirical formula can be used to get the connector's characteristic impedance [7]:…”

Section: Network Cable and Connectorsmentioning

confidence: 99%

Reliability Study on Physical Layer of CAN Bus in Engineering Application

Kuang

Liu

2011

AMR

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“…For the cable the IEC 96-1A standard was used to obtain transfer impedance values and for the Dsub connector a method was used that is described in [ 2 ] . Measurements were performed inside a fully anechoic chamber where the excitation of the test system was done with an incident electromagnetic plane wave (fig.…”

Section: Simulationsmentioning

confidence: 99%

SPICE models of barrier compared to measured data

Lundgren

Carlsson²,

Delsing³

2001 IEEE EMC International Symposium. Symposium Record. International Symposium on Electromagnetic Compatibility (Cat. No.01CH

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SPICE models of electromagnetic zone barrier are devised. The models are based on data from 2D and 3D Maxwell equation solvers. A transfer impedance approach modeled incident electromagnetic waves in SPICE. Test systems using D-sub connectors, passive surface mounted filters and encapsulation was designed. Test system verification measurements were made in a fully anechoic chamber. The coupling through the zone barriers was measured. Good agreement was found between simulated and measured data. c2,dz c3,dz

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