When selecting an AC source one should be concerned with the source impedance and inrush current capabilities for emission testing and inrush current measurements required for the CE mark. The power must also be clean enough to make higher frequency measurements. The AC source should also be programmable to be useful for generating the waveforms and dips and sags required by the 1000-4 series standards coming on line. A good AC source can be used as a power source for low frequency immunity testing. In other words to make maximum use of the AC source it should also be a piece of test equipment as well as a simple power source. Some users have their AC sources calibrated so they can be used for the EMC Directive.
I can recommend the AC sources from a Swedish company named Combinova. The US distributor is Ergonomics, Inc. at 800-862-0102 or visit the WEB site at http://www.ergonomicsusa.com <http://www.ergonomicsusa.com> Dave George Unisys Corp. ---------- From: Richard Cass [SMTP:[email protected]] Sent: Friday, June 12, 1998 9:37 AM To: [email protected] Subject: generating 50Hz power in the US We want to do ongoing testing of an ITE product (here in the US) on 220 VAC 50Hz power to simulate the European environment to make sure our power supply vendor is doing his job. In this esteemed group's experience, what is best (i.e easiest, cheapest, most reliable) way to set this up. I have an electrician describing scenarios of a 60Hz electric motor mechanically driving a 50Hz generator. In this age of high power solid state electronics, I gotta believe there's a better way. Please keep answers simple as I am only a lowly mechanical engineer (analogies to water running through pipes always is always big help to me). At 120VAC our products pull 6 amps peak at start up and only 3 amps running. I would never test more than 4 products at a time. Thanks in advance for the usually invaluable help that I get from this group. Richard Cass Iris Graphics, Inc.
