What are 6.5 Digit Multimeters Good For?
in [Design]
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From: Archimedes' Lever on 15 Mar 2010 23:17 On Mon, 15 Mar 2010 19:53:04 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Mon, 15 Mar 2010 19:47:01 -0700, Archimedes' Lever ><OneBigLever(a)InfiniteSeries.Org> wrote: > >>On Mon, 15 Mar 2010 12:11:23 -0700, John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Fri, 12 Mar 2010 18:56:02 -0800, Archimedes' Lever >>><OneBigLever(a)InfiniteSeries.Org> wrote: >>> >>>>On Fri, 12 Mar 2010 15:23:12 -0800, John Larkin >>>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>>> >>>>> >>>>>Except that you never get too much copper... always too little. >>>>> >>>>>John >>>> >>>> >>>> Maybe from your board house, dipshit. >>> >>>Measure the sheet resistivity of traces on a few of your boards and >>>tell us what you see. >>> >>>John >> >> >> You do know that we do not use copper boards any more, right? > >I didn't know that. What do you use? > >John It is an RoHS world, John. What do you think we use? It ain't HASL over Copper or SMOBC, I'll tell ya.
From: John Larkin on 15 Mar 2010 23:24 On Mon, 15 Mar 2010 20:17:05 -0700, Archimedes' Lever <OneBigLever(a)InfiniteSeries.Org> wrote: >On Mon, 15 Mar 2010 19:53:04 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Mon, 15 Mar 2010 19:47:01 -0700, Archimedes' Lever >><OneBigLever(a)InfiniteSeries.Org> wrote: >> >>>On Mon, 15 Mar 2010 12:11:23 -0700, John Larkin >>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>> >>>>On Fri, 12 Mar 2010 18:56:02 -0800, Archimedes' Lever >>>><OneBigLever(a)InfiniteSeries.Org> wrote: >>>> >>>>>On Fri, 12 Mar 2010 15:23:12 -0800, John Larkin >>>>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>>>> >>>>>> >>>>>>Except that you never get too much copper... always too little. >>>>>> >>>>>>John >>>>> >>>>> >>>>> Maybe from your board house, dipshit. >>>> >>>>Measure the sheet resistivity of traces on a few of your boards and >>>>tell us what you see. >>>> >>>>John >>> >>> >>> You do know that we do not use copper boards any more, right? >> >>I didn't know that. What do you use? >> >>John > > It is an RoHS world, John. What do you think we use? Can't imagine. > > It ain't HASL over Copper or SMOBC, I'll tell ya. You said that "we do not use copper boards any more." So what are the traces made out of? John
From: krw on 15 Mar 2010 23:26 On Mon, 15 Mar 2010 20:17:05 -0700, Archimedes' Lever <OneBigLever(a)InfiniteSeries.Org> wrote: >On Mon, 15 Mar 2010 19:53:04 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Mon, 15 Mar 2010 19:47:01 -0700, Archimedes' Lever >><OneBigLever(a)InfiniteSeries.Org> wrote: >> >>>On Mon, 15 Mar 2010 12:11:23 -0700, John Larkin >>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>> >>>>On Fri, 12 Mar 2010 18:56:02 -0800, Archimedes' Lever >>>><OneBigLever(a)InfiniteSeries.Org> wrote: >>>> >>>>>On Fri, 12 Mar 2010 15:23:12 -0800, John Larkin >>>>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>>>> >>>>>> >>>>>>Except that you never get too much copper... always too little. >>>>>> >>>>>>John >>>>> >>>>> >>>>> Maybe from your board house, dipshit. >>>> >>>>Measure the sheet resistivity of traces on a few of your boards and >>>>tell us what you see. >>>> >>>>John >>> >>> >>> You do know that we do not use copper boards any more, right? >> >>I didn't know that. What do you use? >> >>John > > It is an RoHS world, John. What do you think we use? What does RoHS have to do with Copper, AlwaysWrong? > It ain't HASL over Copper or SMOBC, I'll tell ya. IOW, you don't know.
From: Randomly on 16 Mar 2010 01:06 >It's interesting to calculate the resistance of traces and actually >measure them. Most pcb houses skimp on plating, so when you specify "1 >oz" copper, you seldom get it. The only place copper is plated is in the holes. The 1 oz copper layer for traces is a copper sheet that is laminated to the board. It's rolled out to the proper 1.4 mil thickness when it's manufactured. It's not plated on by the PCB manufacturer. You may be making measurement errors when you measure the traces, 1 amp can be a lot of current on small traces and you may be heating that trace up quite a bit. Copper has a substantial thermal coefficient of resistance, heat it up by 25C and the resistance goes up 10%. Try dropping your current to 0.1A and see how your measurements change. --------------------------------------- Posted through http://www.Electronics-Related.com
From: Archimedes' Lever on 16 Mar 2010 07:24
On Mon, 15 Mar 2010 22:26:58 -0500, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote: >On Mon, 15 Mar 2010 20:17:05 -0700, Archimedes' Lever ><OneBigLever(a)InfiniteSeries.Org> wrote: > >>On Mon, 15 Mar 2010 19:53:04 -0700, John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Mon, 15 Mar 2010 19:47:01 -0700, Archimedes' Lever >>><OneBigLever(a)InfiniteSeries.Org> wrote: >>> >>>>On Mon, 15 Mar 2010 12:11:23 -0700, John Larkin >>>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>>> >>>>>On Fri, 12 Mar 2010 18:56:02 -0800, Archimedes' Lever >>>>><OneBigLever(a)InfiniteSeries.Org> wrote: >>>>> >>>>>>On Fri, 12 Mar 2010 15:23:12 -0800, John Larkin >>>>>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>>>>> >>>>>>> >>>>>>>Except that you never get too much copper... always too little. >>>>>>> >>>>>>>John >>>>>> >>>>>> >>>>>> Maybe from your board house, dipshit. >>>>> >>>>>Measure the sheet resistivity of traces on a few of your boards and >>>>>tell us what you see. >>>>> >>>>>John >>>> >>>> >>>> You do know that we do not use copper boards any more, right? >>> >>>I didn't know that. What do you use? >>> >>>John >> >> It is an RoHS world, John. What do you think we use? > >What does RoHS have to do with Copper, AlwaysWrong? The field is called "intermetallics". I wouldn't expect a ditz like you to get it, always-fucked-in-the-head. > >> It ain't HASL over Copper or SMOBC, I'll tell ya. > >IOW, you don't know. You wouldn't know what I know. You never will. You are pathetic, Williams. |