Specifications

Operation
VTM-200 Installation and Operation Handbook 3-3
Table 3-1. Description of Front Panel Controls and Indicators (continued)
Key Label Description
21
WAVEFORM (ZOOM) This button has a dual purpose:
 Press to cycle through the composite waveform display between its
normal display of -50 to 120 IRE levels, a display zoomed around a
center value of 0 IRE ± 20 IRE, and a display zoomed around a center
value of 100 IRE ± 20 IRE. The PAL waveform, when displayed as volts,
cycles between -0.1 to +0.7 volts, 0 ± 0.1 volts, and + 0.7 ± 0.1 volts.
This button has a dual use.
 When the SETUP menu is displayed, this button functions to select only
those items not concerned with audio, and forces the menu to appear in
the screen quadrant normally occupied by the audio levels display.
22
ON (WAVEFORM
ZOOM)
LED lights when the waveform display is zoomed around either 0 IRE or 100
IRE in composite mode; +0.0 or +0.7 volts in component mode.
23
SETUP Press to enter or exit the SETUP menu.
24
LINE SELECT Press to enter or leave the line select mode. In this mode, the waveform and
vector displays show only one line out of an entire two-field frame of video.
When not in the line select mode, the displays accumulate all of the video
lines, with those occurring earlier in time decaying in brightness, simulating
the persistence of the phosphor in an ordinary oscilloscope CRT.
25
ON (LINE SELECT) LED lights when in the line select mode, displaying only one line.
26
LINE Rotate to select which line the waveform and vector displays when line select
mode is operative. The line number and field identification are displayed at the
bottom of the waveform display. For an NTSC or 525/60 signal, 1 odd to 263
odd, 1 even to 262 even are shown. For a PAL or 625/50 signal, line number
ranges from 1 to 625, with lines 1 through 313 being designated in the odd
field, and lines 314 through 625 being in the even field. Clockwise rotation of
the LINE control increases the selected line number; counterclockwise rotation
decreases it. For component displays, each component is individually shown
before the line number is incremented or decremented.
27
H (WAVEFORM
POSITION)
This control has a dual purpose:
 Rotate to control the horizontal waveform position.
 If the SETUP menu is visible, this control allows the user to select menu
items.
28
V (WAVEFORM
POSITION)
This control has a dual purpose:
 Rotate to control the vertical waveform position.
 If the SETUP menu is visible, this control allows the user to select the
values of the displayed menu item.
29
VECTOR PHASE
Rotate to control the rotation of the composite vector display through 360°.
This allows positioning of the tips of the display within the graticule targets
that represent the correct phases for color bar test patterns.