Videotek TVM9100PKG Installation And Operation Handbook page 213

Section 5 ♦ Alarm Descriptions
Setting Alarms
Most alarms monitor all lines of the video signal. The VITS alarm is an exception. The
VITS alarm is used to monitor activity or the lack of activity on a particular line. The
GAMUT alarm is more typical. The GAMUT alarm will monitor the entire active
picture for errors over the selected limits chosen on the menu.
Limits are selected in the SETUP Menu by choosing a value using the UP/DOWN or
CURVED ARROW knobs, or the UP or DOWN Navigation buttons.
Sensitivity and Duration are two general terms used in the alarm menus:
• Sensitivity
Sensitivity is set by Consecutive Errored Samples (CES). When setting amplitude
limits, a noise spike can exceed the limit while the video amplitude can be within
the limit. With the CES set to a low number, a spike is detected and an alarm is
displayed. Set the CES to a higher number to ignore the fast spike. Each CES
occurs at 37ns intervals for SD and 13.5ns for HD. Use this as a guideline to select
the appropriate CES value.
Not all alarms have CES associated with them; in such cases, use the duration to
increase or decrease the general sensitivity.
• Duration
This value is used to determine how long an error must persist before it is reported.
Set the duration to 0 to cause an error to be displayed as soon as the CES value is
met.
TVM Series Installation and Operation Handbook
Copyright © 2008, Harris Corporation
189