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Chapter 7 - Some Technical Matters: Electrodes, Stimulators, Amplifiers, Display, Averagers

Published online by Cambridge University Press:  14 September 2023

John A. Jarratt
John A. Jarratt
Affiliation:
Emeritus, Sheffield Teaching Hospitals NHS Foundation Trust
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Summary

The tools of the trade are briefly considered from a technical point of view. Recording electrode types and common configurations of their placement are described. Stimulators may be constant current or constant voltage in type. Differential amplifiers are used to increase common mode rejection. The use of trigger and delay facilities enable repeated potentials to be visualised in their entirety. Averagers lift small potentials above the background noise level.

Keywords

ElectrodesStimulatorsDifferential AmplifiersTrigger and DelayAveragers
Type
Chapter
Information
Essential Electromyography , pp. 18 - 23
Publisher: Cambridge University Press
Print publication year: 2023

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