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Article: The art of measuring low resistance: don't heap all the blame for a wrong measurement on the DMM. There can be several less obvious sources of the errors.(SWITCHING PRINCIPLES)
- Article from:
- EE-Evaluation Engineering
- Article date:
- November 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 Nelson Publishing. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Testing assemblies and components usually includes checking the continuity of connectors, wires, traces, and low-value resistive elements. Such applications typically require both a DMM and a switching system.
Many users select a DMM and switching cards based only on the specifications of the DMM and later are surprised to find that their measurements are an order of magnitude less accurate than expected. Many users don't recognize the error as a system problem and conclude that the DMM is not meeting its specification.
Making accurate, stable, and repeat-able resistance measurements is an art. There is plenty of technology involved, but the art is an ...