Within Q-SYS, a 22 kHz pilot tone (outside the audible range of human hearing and undetectable above the program material) is transmitted along each loudspeaker line. Q-SYS, knowing the impedance value of the PTL-1, is then able to easily detect any deviation in the impedance at 22 kHz.
Any significant drop below a predetermined impedance will signify that a short circuit has occurred, while any rise above signifies that an open circuit has occurred. Each failure scenario will then generate a time stamped event into the Q-SYS Event Log, which may then trigger alert messages if desired. Additionally, the user can select whether the pilot tone is only generated during a scheduled maintenance check, or whether the tone is always active to provide real-time diagnostics on every zone.
Inputs |
1 |
Voltage |
70/100V loudspeaker line |
Center Frequency |
22 kHz |
Connector |
Ceramic screw-down |
Dimensions |
3.3” × 3.3” × 1” (84 × 84 × 25 mm) |
Weight |
Approx. .06 lb (.03 kg) |