How to quickly screen for EMC during industrial servo pre-testing?

EMC pre-testing during product development can quickly and cost-effectively identify potential problems. Etymotic's rapid screening methods include:

1) Conducted pre-testing: Using an Artificial Power Network (LISN) and spectrum analyzer, measured conducted interference at power ports in a laboratory environment and compared to standard limits.

2) Radiated pre-testing: In an open area (or simple shielded room) at a distance of 3 meters or less, using a spectrum analyzer and log-periodic antenna/horn antenna, scanned for radiated interference from 30MHz to 1GHz. Pay particular attention to harmonic points at the switching frequency.

3) Using a pre-compatible receiver or a spectrum analyzer with peak detection, although less accurate than full compliance testing, it can quickly identify out-of-range frequencies.

4) Key inspection items: Conducted and radiated interference at the switching frequency and its harmonics, leakage in chassis gaps, and common-mode current in cables.

After identifying problems, immediate near-field probe localization and rectification are performed. Rapid pre-testing saves time and costs in later formal certification, accelerating product launch.