AFDS2 Automatic Failure Detector and Substitutor provides continuous electronic supervision of the main and standby power amplifiers in a sound system, and substitutes the standby power
amplifier should the main power amplifier’s output drop by as little as 2 dB*.The changeover is almost instantaneous with virtually no loss of signal, thereby assuring uninterrupted performance.This device is a critical, highly desirable component in systems with a dedicated emergency announcement amplifier.
The AFDS2 pulses a 40 kHz frequency into the inputs of the main and standby power amplifiers and continuously analyzes their output. If the 40 kHz level from either amplifier should fall below 2 dB*, a fault alert tone will sound, indicating a failure. Front, panel-mounted LEDs indicate which (main or standby) amplifier has failed.The fault alert tone may be silenced by momentarily pressing the SILENCE button; however, the LED will stay on for the duration of the malfunction and the SILENCE button will automatically reset when the failure is corrected.
Supervises both main and standby power amplifiers
Automatically transfers operation to standby
power amplifier
LEDs and fault alert tone notify user of a 2 dB
or
greater drop in either amplifier’s output
Automatically restores operation to main power
amplifier when trouble is corrected
Rear-panel screwdriver-adjustable controls for
setting the oscillator level and the detector levels
and sensitivities
Operates with 25V or 70V constant-voltage
systems, balanced or unbalanced
Screw terminal or phono jack connections
Operates from 120V AC or 12V DC
Standard 19-inch rack mounting
Front panel made of #16-gauge cold-rolled steel,
finished in black enamel
Warranty - Yes
Spec Sheet available - Yes
Operating Temperature (Maximum):
149 F
Operating Temperature (Minimum):
14 F
Depth:
7.50 in
Height:
3.50 in
Width:
19 in
Product Weight:
8 lbs
Color:
Black
Warranty (Length/Type):
2 years
Supervision Frequency:
40 kHz
Supervision Frequency Level:
5 to 50 mV into 47 kilohms
Input Impedance:
10 kilohms
Detector Input Signal @ 40 kHz:
2 V
Detector Supervision Range:
2 to 12 dB
Failure Indicators:
LEDs (visual) and tone module (aural)