En 50147-1 Pdf -

If you cannot access EN 50147-1, consider these:

Remember: a chamber that fails EN 50147-1 validation is a liability, not an asset. It can produce false passes (due to external noise masking real emissions) or false failures (due to ambient signals entering during immunity tests). By mastering this standard, you protect the integrity of every EMC measurement you will ever make. en 50147-1 pdf