Videotek TVM9100PKG Installation And Operation Handbook page 221

Alarm Descriptions
H (Horizontal) Sync Lower
The H Sync Lower alarm occurs when the horizontal sync pulse falls outside the lower
limit for a period in excess of the duration setting.
Burst Upper
The Burst Upper alarm occurs when the peak absolute value of burst falls outside the
upper limit for a period in excess of the duration setting.
Burst Lower
The Burst Lower alarm occurs when the peak absolute value of burst falls outside the
lower limit for a period in excess of the duration setting.
Burst to Chroma Phase
The Burst to Chroma Phase alarm occurs when the relative phase between burst and a
particular color on a selected line and location on the line exceeds a user-defined upper
and lower phase tolerance for a period in excess of the duration setting.
For example, assume that the Vertical Interval Test Signal of color bars on line 17,
field 2 is selected. Also, assume the line position is set to monitor the blue color packet
with a range of 5° and duration of 0 seconds. If the phase error between burst and the
blue vector point exceeds ± 5°, an alarm occurs.
Horizontal Blanking (H Blanking)
The Horizontal Blanking (H Blanking) alarm occurs when the time interval between
the end of active video and the start of active video violates the specified limits for a
period in excess of the duration setting. The limits are:
• NTSC: 10.7 to 11.1 µs
• PAL: 11.8 to 12.2 µs
For this measurement to be accurate, active video must be higher than 20 IRE (NTSC)
or 350 mV (PAL).
Vertical Blanking
The Vertical Blanking alarm occurs if the number of lines during the vertical blanking
period violates the selected width limit for a period in excess of the duration setting.
The selectable widths are 20 to 25 Lines for NTSC, and 25 to 30 Lines for PAL.
SC/H Phase
The SC/H Phase alarm occurs when the phase angle of burst compared to the 50%
point of the leading edge of horizontal sync on line 10 of field 1 (NTSC) or line 1
(PAL) exceeds the range setting for a period in excess of the duration setting. The
range is ± 5° to 90° in NTSC and ± 5° to 45° in PAL.
TVM Series Installation and Operation Handbook 197
Copyright © 2008, Harris Corporation