> This has always perplexed me: surely if you're connecting > across 2 of 3 phases (something we don't do in the > UK) then the voltages are at 120 degrees phase angle to each > other, so you will be getting a distorted > waveform, not a sine wave? Get hold of some software which will draw graphs (or even goldwave or something similar which lets you generate waveforms on screen) and try it. That's how I finally figured out how it worked- draw the 3 phases as 3 sine waves, then try various sums of them to get a feel for what it looks like. Nigel -- Nigel Orr, Design Engineer nigel@axoninstruments.co.uk Axon Instruments Ltd., Wardes Road,Inverurie,Aberdeenshire,UK,AB51 3TT Tel:+44 1467 622332 Fax:+44 1467 625235 http://www.axoninstruments.co.uk This e-mail and any files transmitted with it ("E-mail") is intended solely for the addressee(s) and may contain confidential and/or legally privileged information. If you are not the addressee(s), any disclosure, reproduction, copying, distribution or other use of the E-mail is prohibited. If you have received this E-mail in error, please delete it and notify the sender immediately via our switchboard or return e-mail. Neither the company nor any individual sending this E-mail accepts any liability in respect of the content (including errors and omissions) and timeliness of the E-mail which arise as a result of transmission. If verification is required, please request a hard copy version -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu