VTM-2400 Installation and Operation Handbook
71
Section 5
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Alarm Descriptions
Setting Alarms
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. 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.
Audio Alarms
Peak Audio
The Peak Audio alarm occurs when the peak audio level exceeds the adjustable limit for a
period in excess of the duration setting.
Loss of Sound
The Loss of Sound alarm occurs when the peak amplitude falls below an adjustable ANALOG
or DIGITAL LEVEL for a period in excess of the duration setting. This alarm is valid for the
displayed input (analog, AES/EBU, or embedded). The alarm is global and independent of the
scale type or input format.
Video Alarms Digital Descriptions
The Video Alarms Digital menu contents are listed below.
EDH
Per SMPTE RP 165-1994; the EDH alarm occurs when one or more errors are detected for a
period in excess of the duration setting.
