2013年2月15日 · Inadequate shielding and bad grounding are often blamed when measurements are inaccurate, especially in high-impedance applications. In fact, shielding and grounding problems are frequently responsible for measurement errors, but many test system developers aren’t quite sure why.

There are many ways to randomly connect shields and grounds but this rarely leads to an optimum set of connections. It is preferable to design a system based on an understanding of the coupling mechanisms and how to avoid their affects. 1. Conducted Interference. Currents flowing in the ground system are a fact of life.

Course introduces principles of EMC management, signal integrity, and grounding, bonding, and shielding. Various grounding techniques are examined and how they are implemented. The correct grounding for achieving adequate shielding is explained.

This standard provides design and testing requirements for bonding, grounding, shielding, electromagnetic interference (EMI), lightning protection, electrostatic discharge (ESD) protection, transient protection, and surge suppression for electrical and electronic ground

2014年6月1日 · Grounding a shield at both ends eliminates the capacitive coupling problem and is most effective when the potential difference between the two shield terminations is low. In this case, the ground loop currents will be small, and the shield will have its maximum effectiveness, provided it is terminated properly.

In this article we will learn about the cable shielding, purpose, selection factors, and grounding of shields.

Grounding means to connect electrical equipment to a common reference ground or earth. Shielding is used both for immunity (protecting against external interference) and emission (preventing interference to be radiated). There are two reasons why you should take really good care of your grounding:

System grounding or earthing involves the ground connection of power services and separately derived systems. They include generator, transformers, uninterruptible power systems (UPS). The system earthing is the intentional connection of a circuit conductor (typically the neutral on a three phase, four wire system - Protective earth (PE)) to earth.

In substations single-point grounding system is accomplished when all equipment are connected to a master bus bar which in turn is bonded to the external grounding system. The grounding system should be designed to reduce AC impedance and DC resistance.

For such installations we recommend using double shielded cables and to have a grounding concept with 3 diferent grounds (ME - Measurement Ground, SE – Shield Ground, PE – Protective Ground) as shown from picture below.