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Operating Information
2–8
WFM 90 and WFM 91 Service Manual
The following special operating modes can be activated through the menus:
Amplitude Alarm Mode. The Amplitude Alarm mode provides a means to
automatically monitor the signal amplitude for the Waveform and Audio
displays. This mode is enabled through the Configuration menu.
For the Waveform display mode, the portion of the signal exceeding the 100 IRE
(1.0 V PAL) graticule line is highlighted. For the Audio display mode, the
portion of the signal exceeding the menu-selected reference level is highlighted.
The highlighted portion of the signal is also visible in the Waveform-in-Picture
(WIP) display mode.
Variable Gain Mode. The Variable Gain mode allows you to vary the signal gain
for the Waveform and Vector displays between 45% and 155%. This mode is
enabled through 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 you to automatically shut down the
backlight and/or the instrument after there has been no front-panel activity for a
menu-selected length of time. The Time-out mode enables you to reduce battery
power usage while the instrument is battery powered and also to extend the life
of the backlight bulb. This mode is enabled through the Configuration menu.
When the backlight times out, the LCD display goes blank and the instrument
appears to be off. The backlight is turned back on by pressing any front panel
button other than the ON button. The backlight shutdown is functional when the
instrument is either battery or DC powered.
When the instrument power times 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.
Special Operating Modes