CMN-41 Series Installation and Operation Handbook
89
Copyright © 2009, Harris Corporation
Section 6
♦
Alarm Descriptions
Setting Alarms
The CMN-41 alarms monitor video and audio signals, time code errors, and GPI errors.
Limits are selected in the Setup menu by choosing a value using the curved arrow knob
or the Up/Down navigation buttons.
Sensitivity and Duration are two general terms used in the alarm menus.
•
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 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.
Alarm Setup Menus
The Alarm Setup menu items, along with their corresponding Table and Description
page locations are listed in
Table 6-1
. An asterisk (*) is shown next to the default
menu selections.
Table 6-1. Alarms Setup Menu
Selection
Table Page
Description Page
Video alarms
89
94
Audio alarms
92
96
Time code alarms
93
96
GPI Alarms
94
97
NOTE
: See page 63 for information on how to navigate through the Setup menus.
Table 6-2. Video Alarms Setup Menu
NOTE
: Descriptions for these selection options start on page 94.
Selection
Selection Option
Selection Option
Selection Option
Format Change
Payload Identifier
Mismatch
