It sounds like there may be an intermittent short, would be a serious issue, or the DMM probe was touching the wrong place.
The orientation of the DMM probes should not matter. That check is simply verifying that the insulators between the metal tab of each rectifier and the metal heat sink are installed correctly - the rectifiers aren't connected to anything yet so no electrical circuit is involved at all. Are you sure the DMM probe touched only the metal tab of the rectifier and not the screw or washer? (The other probe touches the bare metal of the Z-bracket.) If so, was all the hardware installed exactly as shown - thermal insulators covering the entire metal area of the tabs as shown in the previous figure and shoulder washers in place to ensure the screws are centered in the holes in the rectifier tabs so they cannot touch the tab itself? 73, Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Don Wilhelm Sent: Monday, September 05, 2011 8:20 AM To: Randy Moore Cc: Elecraft Discussion List Subject: Re: [Elecraft] [K3] KPA500 Build question Have you tried reversing the leads? That often helps. 73, Don W3FPR On 9/5/2011 11:05 AM, Randy Moore wrote: > I'm building KPA500 #370 for a friend. On p. 23 of the assembly manual, > 2nd step says DMM should read same as if the probes are not touching > (10.0 Mohm), but all four readings are several hundred (300 - 600) > Kohms. Problem??? > > 73, > Randy, KS4L > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
