AS2220
How to measure EWIS or PS speaker zone impedance
Impedance is a measure of the opposition to the flow of an alternating current in a circuit; the aggregation of its resistance, inductive and capacitive reactance. Represented by the symbol Z.
Maintenance Procedures for Emergency Warning & Intercommunication Systems
The maintenance of Emergency Warning & Intercommunication Systems is generally carried out according to the following standards;
Australia adopts new warning signals
Around the world, there is a move toward a International Standard for Acoustics-Audible Emergency Evacuation Signal, also known as a "Temporal-Three, T-3 or Temporal Tone". The temporal tone is being adopted around the world as the standard evacuation tone pattern and allows for better recognition by all Australians and people from other countries.
