Digitimer D400-4 Gebruikershandleiding - Pagina 14

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Digitimer Ltd – D400 Operator's Manual

Version 1.2

Channel Status LED's

Above each BNC input socket are two LED's. When the D400 is actively removing noise from

a signal, the SIGNAL LED is green and the bi-colour TEMPLATE LED is Green or Amber. The

TEMPLATE LED's change colour or are extinguished when the D400 is in different operating

modes (see below).

Front Panel Controls

The front panel of the D400 has three push buttons. These buttons have the following

functions:-

CLEAR

A single press erases the existing noise template and the D400 begins to construct a new

one. When this button is pressed and the template erased, any previously removed mains

noise present in the signal will re-appear and gradually decrease in amplitude as a new

noise template is constructed.

HOLD

This freezes the noise template so it no longer evolves with changes in the noise level. This

may be useful in situations where the user needs to adjust some recording equipment and

expects to introduce briefly, some additional noise. Pressing HOLD again once the

interruption has taken place, unfreezes the template, causing minimal disruption to the

noise removal process. While the D400 is in the "Hold" mode, the TEMPLATE LED's are

AMBER.

BYPASS

This allows the user to see what the raw signal passing through the D400 looks like without

any noise cancellation. When the D400 is in "Bypass" mode, the TEMPLATE LED's are

extinguished.

All three front panel buttons apply their actions globally (i.e. to every channel). For

independent channel control, it is necessary to use the

D400 Control Panel

Software.