IRT, Video Sync Loss Detector



* Ex GST. Check with us for the latest pricing

- Differential loop through input does not effect other equipment.
- Good noise immunity.
- Selectable alarm on and off timing.
- Automatic, manual or remote reset.
- 2 x Relay contact alarm outputs.
- Convenient Eurocard design.

The VG-737 video detector is used to indicate the presence of a video signal by detecting the vertical sync component of a composite video signal. The detection circuitry used ensures that noise alone will not trigger the detector.

The video input is a high impedance bridging differential input circuit with the input common raised above ground, this allows the VG-737 input to bridge a signal cable without affecting common mode rejection circuitry that may be incorporated in the equipment terminating the cable.

The video signal level threshold at which the VG-737 switches is set by an internal control and may be adjusted for a signal level in the range 0.4 V to 0.7 Vp-p at the input.

The detector circuitry consists of a sync separator and vertical integrator, which triggers a dual mono stable circuit that allows the response time of the alarm circuit to be set.

The response time is set by means of DIP switches in the RC timing circuit and is adjustable from 1 to 32 seconds for the VIDEO FAIL time out and 1 to 8 seconds for the VIDEO ON response time, the adjustment being made in 1 second steps.

The alarm circuitry consists of a latching circuit triggered by the detector circuit, which drives a relay whose contacts are available at the rear panel of the VG-737.

The alarm circuit can be reset automatically upon return of the video signal or by a contact closure from the front panel or a remote circuit.

Visual indication of the state of the VG-737 detector and alarm circuits is provided by LED indicators on the front panel.

Download Product Datasheet


Syd: 02 8213 0200  Mel: 03 8691 5210 Qld: 07 3607 3785 WA/SA/NT: 08 8120 3203

New Zealand: 
Akl: 09 271 4000 Wel:  04 499 3888

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