Tektronix WFM 601A, Service Manual

Page: 46 / 368

Operating Information
2–10
WFM 601A, WFM 601E, & WFM 601M Service Manual
The center three knobs located below the CRT have multiple functions. Your
selection of DISPLAY or MENU functions or items from on-screen menus
determine the current function of each knob. A label adjacent to the knob
indicates its current function. The outside knobs are permanently assigned to
control vertical and horizontal trace position.
The five bezel buttons along the right side of the CRT have multiple functions.
Your selection of DISPLAY modes, MENU functions, or on-screen items from
the displayed menus determine the current function of each button. A label
adjacent to each button indicates its current selection. The buttons either step
through a list of two or more items or turn a function on or off.
Six buttons in the DISPLAY area control the type of display. Most buttons
represent two related types of displays. Press a button to select one of its two
displays. Press the button again to select the other. When you select a display
type, the indicator LED beside it lights up.
EYE. Displays the serial input signal as an Eye pattern display. You can choose
standard or equalized Eye displays (WFM 601E, WFM 601M).
JITTER.
Displays the peak-to-peak jitter measurement over a specified band-
width. The display includes the demodulated jitter waveform for measurement
(WFM 601M).
VECTOR. Displays the component signals as either conventional Vector or
Lightning mode. Vector mode plots the chrominance signals, P
b
and P
r
, against
each other to show their phase and amplitude relationships. The Lightning mode
shows amplitude and timing relationships between the luminance and chromi-
nance signals. The top of the display plots Y against P
b
while the bottom plots Y
against P
r
.
GAMUT. Displays the video signal in Diamond or Arrowhead gamut displays.
Diamond mode evaluates RGB signals for gamut limit violations. Arrowhead
display plots Y versus chrominance magnitude to show adherence to composite
gamut limits. A gamut error message appears at the lower-left when an RGB or
Composite gamut error is detected. Turn this alarm on or off in the CONFIG
menu.
WAVEFORM.
Displays the video signal as voltage versus time. Any or all of the
three channels can be displayed from a single video line.
PARADE. Displays up to three channels of the video signal in succession.
Bezel Knobs
Bezel Buttons
DISPLAY Buttons