I would like to compile thoughts and techniques that members of this group use to perform "in situ" tests on large industrial apparatus. Considerations I have typically encountered include:
Current draw in excess of available LISN capacity. Use CISPR voltage probe Current draw in excess of available EFT & surge coupling network capacity. EFT, use 33nF cap. Surge,? 3 or 10m EUT to antenna distance not achievable and/or high ambients. Lab type radiated immunity not practical due to interference potential. Large equipments requiring multiple antenna locations or search and optimize considerations for radiated emissions. I am especially interested in potential alternate techniques for radiated immunity. Potential solutions may include ad hoc testing using actual transmitters, eg cell phones, VHF, etc. Testing at discrete frequencies of known public broadcast bands. Extended frequency conducted immunity testing. If you have thoughts or other considerations, please respond to the group. As US labs are granted CAB status, consensus on these, and other issues will be helpful. Doug Frazee Lead Compliance Engineer Windermere Military/Commercial Compliance Laboratory Annapolis, MD USA [email protected] --------- 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).
