Basically, one combines the ambient, a signal whose amplitude is not dependent on distance from an EUT, in the correct phase and amplitude, with the signals received by an antenna on the OATS. There are at least three ways (counting CASSPER) this can be done, ranging from the technically sophisticated to the technically ridiculous (but still effective).
What you pay for in using a technically sophisticated method is speed of testing and reliability - it is less dependent for its effectiveness on the tech or engineer doing the test. What you pay for simplicity, is awkward and time-consuming set-up which requires much more of a tech or engineer. Plus, regrettably, people are more apt to believe your results if it takes a lot of equipment to achieve them. (sigh) Cortland ====================== Original Message Follows ==================== SNIP List-Post: [email protected] Date: Wed, 22 Mar 2000 23:38:20 -0800 From: Doug <[email protected]> Subject: Re: Ambient Cancellation Device for OATS Reply-To: Doug <[email protected]> Perhaps it's because I've never understood ... How exactly does one do ambient cancellation at an OATS? UNSNIP ------------------------------------------- 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]
