Connecting the emergency call button for the disabled method: as close as possible to the main conversation area, so that the pickup effect is better.
Emergency call button in connection with the need to pay attention to the problem:
Emergency call button and other audio amplification, audio amplification or recording equipment at all levels of mating between the more important.
During all the connection process or toggle the switch, adjust the volume of your amplification equipment to the minimum, to avoid momentary electrical shock.
Check that the noise is not due to sound self-excitation: the speakers for monitoring must not be too close to the monitor head, and try not to test in the same room.
. Due to the high sensitivity of the monitor head, the speaker's sound feedback to the microphone of the monitor head will inevitably lead to sound self-excited whistling. The same room need to monitor, you can use headphones.
The best way to do this is to run a separate line, not to use the same cable slot with AC power and other strong power, and to try to stay away from transformers, lamps and lanterns rectifiers and other strong electromagnetic interference equipment.
The use of 0.5RVVP shielded cable can also effectively avoid external interference, which requires the shielding layer of single-ended grounding.