What are TRANSIENTS and HIGH FREQUENCY NOISE?
A TRANSIENT is a non-repetitive very high magnitude short time voltage (E) and current(I). It can be many thousand of volts and amps and last for only a microsecond (0.000001 seconds). HIGH FREQUENCE NOISE is a repetitive low magnitude <1000V and very high frequency 100 kilohertz (KHZ) 100 megahertz (MHZ) occurrence. Q Are there other sources for TRANSIENTS than sensitive electronic equipment? Yes While 80% of problems come from within a plant from electronic equipment and when motors and electrical equipment start and stop, 20% of the problems come from outside. These are higher magnitudes and are caused by lightning, utility grid switching, capacity switching, accidents, etc. Q What problems do TRANSIENTS cause? TRANSIENTS can damage equipment. High levels may cause immediate failure of P.C.s, printers, fax machines, adjustable speed drives, etc. They may also cause repeated low levels of damage called electronic rust so that when failure occurs it cannot be identified with a specifi
