: It applies to both analogue and digital secondary signals.
: Covers rated frequencies from 15 Hz to 400 Hz , as well as dedicated DC applications. iec 618691 pdf
: Sets standards for "normal" and "special" environmental factors, including ambient temperature, altitude, vibration, and pollution levels. : It applies to both analogue and digital secondary signals
The standard specifically targets equipment intended for applications where the nominal voltage is . It covers a wide range of operational parameters: including ambient temperature