Sam, concerning the 60 volts of bleed-over: I'm assuming the 230 volt outputs of the 1:2 transformer are floating and the 60 volts was measured between one transformer output line and PE GND using a DMM (10 M ohm input). If this is so, this indicates a primary-to-secondary capacitance of a few hundred pF, which is expected from this type of transformer. Since you will be connecting one of the transformer output lines to PE the problem is taken care of. Dave Cuthbert Micron Technology -----Original Message----- From: Sam Wismer [mailto:swis...@acstestlab.com] Sent: Monday, December 16, 2002 8:07 AM To: EMC Forum Subject: Euro AC Power Source
Hi Group, It's been a long time since my last post. Hope everyone has been well. We have a several AC power sources that can provide 230Vac/50Hz power. Only one however provides true Euro power in that it provides 230VAc on the line side. This unit only has around 6 amps of capacity. We need to be able to provide at least 20amps. We have 2 other units with higher current capacity, but the 230 Volts can only be provided via 115V on L1 and L2 to ground. I have been told by some, that using this power source is acceptable for emissions and immunity testing. I'd like some feedback on that. I can justify it, perhaps, for radiated emissions, radiated fields, ESD and perhaps magnetic fields, but I am skeptical that this would be okay for AC mains testing that apply immunity at various phase angles and also for EN 61000-3-2 and -3. Any comments? Another question, we have tried using a 2:1 transformer to step up the 115, but we end up with about 60Volts of bleed over to the other line. Is this typical of transformers? Anyway to prevent this? Kind Regards, Sam Wismer Engineering Manager ACS, Inc. *Tel: (770) 831-8048 *Fax: (770) 831-8598 *Web: <http://www.acstestlab.com> www.acstestlab.com <mailto:*swis...@acstestlab.com> *swis...@acstestlab.com
