ISO Failure Mode Severity Classification All classifications given below are for the total device/system functional status. The word “function” as used here concerns only the function performed by the electronic system. Class A: all functions of a device or system perform as designed during and after exposure to interference. Class B: all functions of a device/system perform as designed during exposure; however, one or more of them may go beyond the specified tolerance. All functions return automatically to within normal limits after exposure is removed. Memory functions shall remain class A. Class C: one or more functions of a device or system do not perform as designed during exposure but return automatically to normal operation after exposure is removed. Class D: one or more functions of a device or system do not perform as designed during exposure and do not return to normal operation until exposure is removed and the device or system is reset by a simple “operator/use” action. Class E: one or more functions of a device or system do not perform as designed during and after exposure and cannot be returned to proper operation without repairing or replacing the device or system.

Tell A Friend  Comment On Page  Bookmark  Print Page