EMC Testing Services

What is Conducted Immunity Testing?


What is the Electrical Fast Transient Immunity Test (IEC/EN 61000-4-4)?

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

What is the Surge Immunity Test (IEC/EN 61000-4-5)?

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

What is the Conducted Susceptibility Test (IEC/EN 61000-4-6)?

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).

What is the Voltage Dip, Short Interruption, and Voltage Variation Immunity Test (IEC/EN 61000-4-11)?

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.

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