AAD-4130:   Stereo Phase & Fail Alarm.

FEATURES:

      Individual left and right failure outputs.
      Stereo out of phase output.
      Adjustable threshold on each output.
      Adjustable fail and restore times.
      Relay isolated outputs.
      Front panel indications.
      Remote, local or auto reset.

Brochure  

User Manual  

GENERAL:

The AAD-4130 audio detector is designed to detect the presence of a stereo program signal and provide alarm outputs on failure of the left, right or both channels and of stereo phase reversal. Alternately the AAD-4130 can be used to monitor two mono audio circuits and provide individual alarm outputs on failure of an audio circuit.

The AAD-4130 will accept audio signals in the range -20dBm to +20dBm from a balanced or unbalanced source, presenting an input impedance of 10kΩ.

The detector circuitry consists of precision rectifier circuits driving comparators, which enable oscillators that trigger dual mono stable circuits that allow the response time of the alarm circuits to be set. The response time is set by means of DIP switches in the RC timing circuit and is adjustable from 5 to 160 seconds for the AUDIO FAIL time out and 5 to 40 seconds for the AUDIO PRESENT response time, the adjustment being made in 5 second steps.

The alarm circuitry consists of latching circuits triggered by the detector circuits. These drive two relays whose contacts are available at the rear panel of the AAD-4130. The alarm circuits can be reset automatically upon return of the audio signals or by a contact closure from the front panel or a remote circuit.

Visual indication of the state of the AAD-4130 detector and alarm circuits is provided by LED indicators on the front panel.

The AAD-4130 is built to the Eurocard format and will mount in all IRT standard frames.


TECHNICAL SPECIFICATIONS:

Audio:
Inputs:
Type
Transformerless, balanced bridging.
Impedance
> 10 kΩ.
Maximum Input level
-20 dBm to +20 dBm.
Connectors
Pluggable screw block connectors, and
Krone IDC connectors.

Control:
Detection threshold
Internal preset adjustments in the range -20 dBm to +20 dBm.

Response Time
5 - 160 seconds in AUDIO FAIL condition.
5 - 40 seconds for AUDIO PRESENT condition.
Timing adjustable in 5 second steps using PCB mounted DIP switch assemblies.

Visual indicators
AUDIO FAIL ALARM
PHASE
AUDIO 1 PRESENT
AUDIO 2 PRESENT
POWER

Outputs:
Relay circuits operated from alarm logic.
Latching or auto-rest mode available.
Make or break relay contacts available.

Inputs:
When operated in the LATCHING ALARM MODE internal logic alarm circuits can be reset by a front panel RESET pushbutton or by external 12V to 48V to an opto-isolator circuit used to isolate the internal logic circuit.

Connector
Pluggable screw block connectors.

Power Requirements:
Voltage
28 Vac CT (14-0-14) or ±16 Vdc.
Power Consumption
2 VA.

Other:
Temperature Range
0 - 50°C ambient.
Mechanical
Suitable for mounting in IRT 19" rack chassis with input output and power connections on the rear panel.
Finish:             Front panel
Grey background, black lettering & red IRT logo.
                       Rear Panel
Detachable silk-screened PCB with direct mount connectors to Eurocard and external signals.
Dimensions
6 HP x 3 U x 220 mm IRT Eurocard.



           
Due to our policy of continuing development, these specifications are subject to change without notice.