Digitimer D400-2 Manuale dell'operatore - Pagina 6

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Digitimer Ltd – D400 Operator's Manual

Version 1.2

D400 Intended Use & Description

Introduction

The Digitimer D400 is a multi-channel, standalone, mains noise eliminator designed for real-

time removal of 50/60Hz mains noise interference from amplified biological and other

signals prior to acquisition by digital data recording systems. The D400 is unique as the first

commercially manufactured, multi-channel, standalone noise eliminator and does not need

to be operated in conjunction with any particular brand of data acquisition system.

The Problem

Mains interference is a perennial problem in the field of electrophysiology, where low

amplitude signals of interest need to be discriminated from background electrical noise

generated by nearby electrical devices. While we would always recommend traditional

noise removal techniques such as adequate grounding, positioning of equipment and the

use of a Faraday cage before employing the D400, this device is ideally suited to situations

where mains noise cannot be completely removed using the methods above or where the

noise is intermittent. The D400 also has a role in mobile or temporary electrophysiological

setups, such as in hospitals, classrooms or other environments where mains noise is likely to

be a particular problem.

Theory of Operation

For those unfamiliar with the concept of operation of active noise eliminators, the D400

receives amplified analogue voltage signals from an amplifier or signal conditioner via its

inputs and as these signals pass through the D400, the noise eliminator constructs and