How do I perform conducted and radiated immunity testing according to IEC 61000 standards?
IEC 61000 Immunity Testing
Immunity testing demonstrates that a product can function in its intended electromagnetic environment without malfunction. Unlike emissions testing (which protects the environment from the product), immunity testing protects the product from the environment.
| Parameter | SOLT Cal | TRL Cal | eCal |
|---|---|---|---|
| Accuracy | Good | Excellent | Good-very good |
| Standards Needed | 4 (S,O,L,T) | 3 (T,R,L) | 1 (module) |
| Bandwidth | Broadband | Band-limited | Broadband |
| Setup Time | 5-10 min | 10-20 min | 1-2 min |
| Best For | Coaxial, general | On-wafer, waveguide | Production, speed |
- Performance verification: confirm specifications against the application requirements before finalizing the design
- Environmental factors: temperature range, humidity, and vibration affect long-term reliability and parameter drift
- Cost vs. performance: evaluate whether the application demands premium components or standard commercial grades
- Interface compatibility: verify impedance, connector type, and mechanical form factor match the system architecture
- Margin allocation: include sufficient design margin to account for manufacturing tolerances and aging effects
Frequently Asked Questions
What test levels apply to my product?
The test level depends on the product standard: residential/commercial equipment (IEC 61000-6-1): 3 V/m radiated, 3 Vrms conducted. Industrial equipment (IEC 61000-6-2): 10 V/m radiated, 10 Vrms conducted. Automotive (ISO 11452): 30-200 V/m. Medical devices (IEC 60601-1-2): 3-10 V/m depending on the intended environment. Military (MIL-STD-461): 10-200 V/m depending on the platform.
What happens if the product fails immunity testing?
Common failures: display corruption, data errors, software crashes, loss of communication, or false outputs. Mitigation strategies: improve filtering on the affected cable (add ferrite cores or pi-filters), improve shielding (close apertures, improve gaskets), add EMI suppression components to sensitive circuits (decoupling capacitors, TVS diodes), and improve PCB layout (better ground plane, shorter trace lengths, improved routing). Re-test after each modification to verify the fix.
How long does immunity testing take?
Conducted immunity (150 kHz - 80 MHz): approximately 30-60 minutes per cable, including setup. Typical EUT with 5 cables: approximately 4-6 hours. Radiated immunity (80 MHz - 6 GHz): approximately 2-4 hours for a full sweep with 4 EUT orientations (front, back, left, right) x 2 polarizations (horizontal, vertical). Plus setup time: approximately 1-2 hours. Total for both conducted and radiated: approximately 1-2 days.