Now covers methods IC01, IC11, IC21, IC31, IC71, and IC81.

Remember: The latest edition of is the only version you should rely on for new projects. An old scanned PDF from 2007 could lead to incorrect noise limits, equipment rejection, and regulatory violations.

The standard provides guidance on the measurement setup, test conditions, and data analysis.

The standard provides a uniform method for measuring and evaluating airborne noise emitted by standard-design machines, including: : Both AC and DC rotating electrical machines.

The official full text is as a public PDF. It is a copyrighted document sold by the IEC Webstore and authorized distributors like iTeh Standards .

Elias was a junior acoustic engineer at a motor manufacturing plant in Stuttgart. It was 2:00 AM on a Tuesday, and he was staring at a prototype casing for a high-voltage induction motor that was supposed to be "whisper quiet." Instead, it was whining like a banshee.