Specifications

General Operation
VTM Series Installation and Operation Handbook
3-39
outer circle (the UPPER gamut alarm limit) represents the highest allowable amplitude
in standard composite units (i.e. IRE for NTSC and units for PAL). The inner circle
(the LOWER gamut alarm limit) represents the lowest allowable amplitude. The rings
turn red when the alarm is enabled and the values exceed the threshold setting.
The other identifiers are radials that extend at the angle of the designated color. These
six lines follow the same displacement as the vector display. Note that since the PAL
display is derived solely from component information, there is not two phases for PAL
signals. The +V phase is used (making the vectors look similar to NTSC).
NOTE: There is an alarm persistence of two seconds associated with any alarm indication. After an
alarm has cleared, two seconds will pass before the gamut alarm indicator returns to normal.
Figure 3-33. Composite Gamut Vector Display Graticule Markings
Table 3-20. Description of Composite Gamut Indicators
Key Indicator Description
1
Lower Gamut Ring The lower gamut ring indicates the Gamut alarm Peak Lower limit. When the
Gamut alarm is enabled and the Peak Lower limit is exceeded, the lower
gamut ring turns red.
2
Upper Gamut Ring The upper gamut ring indicates the Gamut alarm Peak Upper limit. When the
Gamut alarm Peak Upper limit is exceeded, the upper gamut ring turns red.
3
Vector Excursion Mark The excursion marks help to visualize the minimum/maximum value of 100%
color bars.
4
Luma Upper Limit Line The Luma Upper Limit Line indicates the Gamut alarm Luma Upper limit.
When the Gamut alarm is enabled, and the Luma Upper limit is exceeded,
the luma upper limit line and LUMA turn red.
5
Luma Lower Limit Line The Luma Lower Limit Line indicates the Gamut alarm Luma Lower limit.
When the Gamut alarm is enabled, and the Luma lower limit is exceeded, the
Luma Lower Limit line and LUMA turn red.