User manual

Operation Basics: Functional Overview
2–6
WFM 90 & WFM 91 User Manual
Audio Out. A standard stereo mini-headphone jack for the output of
the audio input signal. The mono input signal is heard on both stereo
channels. The audio volume is fixed for each reference level. The
larger the displayed signal, the louder the volume.
DC Power Input Connector
DC IN 11 – 18 V. A 2 mm plug which accepts a 12 VDC power input
using a negative center lead.
CAUTION. DC Power Source
To avoid possible damage to the instrument circuitry when using a
DC power source other than the supplied AC adapter, ensure that the
DC source is a negative-ground 11 – 18 V system with a negative
center lead. The DC source should be able to provide 12 W of power.
Special Operating Modes
Amplitude Alarm Mode
The Amplitude Alarm mode provides a means for automatic
monitoring of the signal amplitude for the Waveform and Audio
displays. The mode is enabled through a menu selection in 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.