User manual

Getting Started: Product Description
1–4
WFM 90 & WFM 91 User Manual
modes. The signal filters are Flat (no filter) and Luminance
(low-pass filtered). The Line Select mode enables the selection of a
single line of video for display.
Vector Display Mode
The Vector display mode presents an XY plot of the demodulated
chrominance phase and amplitude portion of the video signal. The
vector angle represents chrominance phase, and the distance from the
center represents chrominance amplitude. The vector display is
useful when making differential gain and phase measurements.
A full 360_ phase shifter, and 75% and 100% color bar settings are
provided. Vector gain is fixed at X1 or X5, or variable from 45% to
155%. The gain setting tracks between the Waveform and Vector
display modes. The +V mode (PAL only) overlays the –V axis on the
+V axis to check the PAL system color encoders.
Picture Display Mode
The Picture display mode provides an unprocessed full color display
of the composite video signal. The NTSC Safe Action and Safe Title
areas, as well as the PAL Safe Area can be highlighted. The vertical
interval portion of the signal can be viewed by vertically shifting the
display. Controls for adjusting the hue and color of the picture
display are provided.
Audio Display Mode
The Audio display mode provides a voltage-versus-time display of a
single audio channel. The audio voltage is displayed on the vertical
scale with time on the horizontal scale at a two-field sweep rate.
Audio reference levels can be set to –10, 0, 4, or 8 dBu, with an
additional level available for microphone checks. The audio
headroom reference level can be set to –3 dB or +10 dB, and is for
audio signals below or above the reference level, respectively.
Waveform-in-Picture Display Mode
The Waveform-in-Picture (WIP) display mode provides a 1/4-screen-
sized window over the Picture display for any one of the Waveform,