This is going to sound like a very naive question, and I almost don't want to ask it, but exactly where is the mains port?
The question comes from some work I've been doing on our LISN. I've used a comparison noise emitter and a 1m mains lead (as required by BS EN 55022) to measure the insertion loss of the LISN. I then connected the CNE directly to the receiver and made a second measurement. At 150kHz, the results are very similar (0.5dB difference), but at 30MHz there is something like 5.5dB difference between the direct measurement and the 1m-cable-to-LISN result. So, if the mains port is the actual connector on the test item, do I have to add a correction factor for the interference loss in the mains lead? Or is the mains port at the end of the 1m cable, in which case no correction factor is required. Or have the standards bodies taken all this into account, and that is why they specify a 1m mains lead? Any suggestions would be gratefully received:) Cheers, Carlos. --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
