Adding EMC Pre-Compliance Testing Capability
EMC pre-compliance capability typically starts with a spectrum analyzer or EMI receiver, LISNs for conducted emissions, near-field probes for locating sources and an ESD simulator for immunity. It shortens design cycles by finding problems before formal compliance testing, which is still usually done at an outside laboratory.
Typical equipment
- Spectrum analyzer or EMI receiver with quasi-peak detection
- LISN(s) matching your product's power configuration
- Near-field probe set and current clamps
- ESD simulator; EFT/surge generators if immunity is in scope
- Shielded tent or enclosure to reduce ambient noise
Limitations
Pre-compliance results indicate risk; they do not replace compliance testing in a validated facility. Correlate your setup with results from the laboratory that performs final testing.
Questions to answer before buying equipment
- Which methods or standards must the laboratory run, and at what edition?
- What sample types, sizes and annual volumes are expected?
- Are accredited (ISO/IEC 17025) results required for customers or regulators?
- What utilities, floor loading, ventilation and environmental control does the space provide today?
- Who will calibrate, service and qualify the equipment, and how quickly can they respond?
- Would outsourcing some work until volumes justify the investment be more economical?
Common questions
- Is pre-compliance testing worth it?
- For products that go through several design iterations, it often reduces repeat chamber bookings. The value depends on how many products and revisions you test each year.