SDAA522 September   2026 ISO6020 , ISOM8110 , ISOM8110-Q1 , ISOM8113-Q1 , ISOM8610 , ISOM8710 , ISOW6441

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
    1. 1.1 Why Magnetic Field Immunity Matters for Isolators
  5. 2 Magnetic Field Units at a Glance
  6. 3 IEC 61000-4-8 — Power Frequency Magnetic Field Immunity
    1. 3.1 What IEC 61000-4-8 Test Simulates
    2. 3.2 Test Levels for IEC 61000-4-8 Continuous Power Frequency Fields
    3. 3.3 Environment Classes — How a Level is Chosen
    4. 3.4 Field Strengths Observed in Actual Installations
  7. 4 IEC 61000-4-9 — Pulse Magnetic Field Immunity
    1. 4.1 What IEC 61000-4-9 Test Simulates
    2. 4.2 Impulse Current Waveform for Pulse Magnetic Field
    3. 4.3 Test Levels for IEC 61000-4-9 Pulse Magnetic Fields
  8. 5 Summary of Class 5 Testing— What We Are Targeting
  9. 6 What "PASS" Means — Performance Criteria
  10. 7 Test Setup Details
  11. 8 Test Results and Summary
    1. 8.1 Test Conditions for Both Standards:
  12. 9 System Design Considerations for End Equipment Performance
  13. 10Summary
  14. 11References

6 What "PASS" Means — Performance Criteria

Test results are classified into four categories, and the applicable product standard says which category is acceptable:

Category Description
A Normal performance within specification limits
B Temporary degradation or loss of function that is self-recoverable
C Temporary degradation or loss of function requiring operator intervention or system reset
D Degradation or loss of function that is not recoverable — damage to hardware, software, or loss of data

For an isolation device, "pass" is defined as Criterion A, evidenced by all the below conditions throughout the time when magnetic field is applied:

  • No bit errors on any isolated data channel
  • No glitches, missing edges, or extra edges on the isolated outputs
  • No Supply fault or UVLO assertion
  • Isolated power supply rail (for devices with integrated DC/DC) remains within specified regulation.