In the March/April issue of Compliance Engineering, there is an article discussing the benefit (namely, repeatability) of free-space emission measurements versus measurements on an OATS. Note: the article suggests changing the EMC standards to allow free-space measurements. He is not equating measurements between the two test styles.
This reminded me of the discussion two months ago on GTEM cells (subject line: GTEM). GTEMs were also described as having free-space characteristics. Aside from the obvious physical differences: 1) What are the pros & cons of a free-space chamber versus a GTEM? 2) Is one of them more appropriate for immunity testing? Emissions testing? 3) Do the distinctions show up in field strength? (immunity testing) 4) Does the difference show up in frequency range? (my interest is radiated emissions below 300 MHz). 5) The article mentions the IEC 61000-4-3 field uniformity measurements in chambers. Is this procedure an issue for GTEMs? ---- Patrick Lawler [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
