Monitor Audio Vector User Manual download pdf (Page 37)

Operation Basics: Functional Overview

WFM 90 & WFM 91 User Manual

2–7

Variable Gain Mode

The Variable Gain mode allows the user to vary signal gain for the

Waveform and Vector displays between 45% and 155%. The mode is

enabled through a menu selection in the Configuration menu.

The variable gain adjustment tracks between the Waveform and

Vector display modes, and can be adjusted from the Waveform-in-

Picture display mode. When the Variable Gain mode is enabled, the

message

GAIN UNCAL is displayed in the on-screen readout.

Time-Out Mode

The Time-out mode allows the user to automatically shut down the

backlight and/or the instrument after there has been no keypad

activity for a menu-selected length of time. The Time-out mode

enables the user to reduce battery power usage while the instrument

is battery powered, and also to extend the life of the backlight bulb.

The Time-out mode is enabled through a menu selection in the

Configuration menu.

When the backlight has been timed out, the LCD display goes blank

and the instrument appears to be off. The backlight is turned back on

by pressing any keypad button other than the

ON button. The

backlight shutdown is functional when the instrument is either

battery or DC powered.

When the instrument power has been timed out, the

ON button must

be pressed to turn the instrument back on. The instrument power

shutdown is only functional when the instrument is battery powered.

Calibration Mode

The Calibration mode allows the user to adjust the instrument to

factory specifications, if necessary. The Calibration mode is entered

by pressing and holding the

CONFIG button for a few seconds. The

instrument adjustments are performed entirely from the keypad with

the use of specified input signals. The instructions for readjusting the

instrument to specifications are located in the service manual.

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Monitor Audio Vector User Manual Page 37