The EFT immunity test is an attempt to replicate realistic inductive load switching by using either direct or capacitative coupling depending on whether your product has a power, a signal port, or both. Below are several examples of inductive load switches which may influence a client’s product:

• Solenoids
• Motors
• Switch contactors
• Relays
• Actuators

Surge immunity testing is intended to mimic low-frequency surges. Below are a few examples of situations one would expect to see surge events:

• Flyback voltage spike
• Power grid insulation defects
• Indirect Lightning

Conducted susceptibility tests are used to simulate RF noise superimposed on power lines and IO signal lines.

Conducted susceptibility is injected using BCI (Bulk current injection) or CDN (Coupling De-coupling networks).

This test specifies the immunity testing procedures and preferred test thresholds for electrical and electronic devices attached to low-voltage power supply networks for voltage dips, discontinuities (aka short interruptions), and voltage variations.

• Voltage dip: drop(s) in voltage. Typically induced by failures in the electrical grid, the product installation, or a significant shift in electrical load.
• Discontinuities: break(s) in voltage. Typically induced by the operation of automated reclosing systems.
• Voltage variations: constant change(s) in voltage. Typically induced by continuously changing loads attached to the electrical grid.