VX-2004 and VX-2005 Programme Fail Detectors

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The VX-2004 and VX-2005 Programme Fail Detectors

These Eurocard modules designed to monitor video and audio signal continuity and provide alarm outputs in the event of signal loss. When used in conjunction with the VX-4026 relay modules or BCU-300 Broadcast Changeover Unit, programme feeds can be re-routed and backup procedures initiated.

The VX-2004 offers one or two channels of audio monitoring. The VX-2005 also offers one or two channels of monitoring, which may be factory configured for audio, video or one channel of each.

The detectors operate by measuring audio level or the level of video syncs, starting a fail timer if the signal level exceeds chosen parameters. If the timer trips before the signal returns to an acceptable level, then an alarm is signaled. If the signal returns to an acceptable level, the restore timer is started, causing the alarm to be terminated if the signal remains acceptable for the duration of the restore timer's run. This combination of controls avoids unnecessary alarms and ensures a good signal is present before canceling the alarm.

Specifications
VX2004: (Audio Programme Fail Detector)	Inputs Detector range Fail timer range Reset timer range Relay output Aux logic inputs	2x line level 0dBu (nom), xformer isolated & balanced -10dBu to -60dBu approx, adjustable Adjustable between 0 & 60 seconds Adjustable between 0 & 60 seconds DPDT signal-quality changeover relay (1 per channel) TTL level for immediate fail override (eg. codec fail)
VX2005: (Video/Audio Programme Fail Detector)	Video inputs Video detector range Video Fail Timer range Video Reset timer range Audio inputs Audio detector range Audio fail timer range Audio reset timer range Relay outputs Aux logic inputs	1 or 2 composite 700mV, 75W ±6dBv 5ms to 5 seconds (set in steps) 5ms to 5 seconds (set in steps) 1 or 2 line level 0dB nominal, balanced -10dBu to -60dBu approx, adjustable (per channel) 0 to 60 seconds adjustable (per channel) 0 to 60 seconds in steps (per channel) Other nominal signal levels & timer ranges are available DPDT signal-quality changeover relay (1 per channel) TTL level for immediate fail override (eg. codec fail)

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