What are 6.5 Digit Multimeters Good For?
in [Design]
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From: Dave Platt on 12 Mar 2010 20:32 In article <4B9AE570.8B9E88(a)earthlink.net>, Michael A. Terrell <mike.terrell(a)earthlink.net> wrote: >> I pointed out that if one were to set the playback amplitude so that a >> least-significant-bit signal produced audio at the listening position >> equal in power to the random thermal noise of air molecules hitting >> the eardrum, a full-scale 32-bit signal would vaporize the power >> lines, explode the building and kill the listener :-) > > > Yes, but what's the downside of letting one more audiophool eliminate >themselves from the genepool? I have reservations about the amount of collateral damage which can occur. Some of the neighbors might be nice, sensible people... and innocent kittens might be hurt in the explosion, as well :-) -- Dave Platt <dplatt(a)radagast.org> AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads!
From: TheJoker on 12 Mar 2010 21:53 On Fri, 12 Mar 2010 16:37:29 -0500, Spehro Pefhany <speffSNIP(a)interlogDOTyou.knowwhat> wrote: >On Fri, 12 Mar 2010 15:31:33 -0600, John Fields ><jfields(a)austininstruments.com> wrote: > >>On Fri, 12 Mar 2010 20:33:42 GMT, Jan Panteltje >><pNaonStpealmtje(a)yahoo.com> wrote: >> >>>On a sunny day (Fri, 12 Mar 2010 10:50:48 -0600) it happened John Fields >>><jfields(a)austininstruments.com> wrote in >>><ekrkp5lg8obtcmftn2tmq8adsnlte9u59e(a)4ax.com>: >>> >>>>On Fri, 12 Mar 2010 12:30:31 GMT, Jan Panteltje >>>><pNaonStpealmtje(a)yahoo.com> wrote: >>>> >>>>>On a sunny day (Thu, 11 Mar 2010 17:56:35 -0800) it happened D from BC >>>>><myrealaddress(a)comic.com> wrote in <MPG.26033f321480b139896e5(a)209.197.12.12>: >>>>> >>>>>>6.5 digit multimeters sell around $1000.00. >>>>>>For electronics development, are these $1000 multimeters really >>>>>>necessary? >>>>>>What are they good for? >>>>> >>>>>They are not needed, all you need is a 5 Euro multimeter, >>>>>and in extreme cases a precise reference. >>>>>That means if you use one of those reference chips, you borrow >>>>>the very accurate multimeter for a day, measure your reference chip, >>>>>write it down, and use that to calibrate your cheap multimeter, >>>>>or o compute it's real value, >>>>>Saved: 1000$ >>>> >>>>--- >>>>If you don't _need_ the accurate multimeter, then how do you get around >>>>the fact that unless you use _it_ to measure the reference, your cheap >>>>multimeter is pretty much a boat anchor? >>>> >>>> >>>>JF >>> >>>Sorry can you explain that again in electronics English? >> >>--- >>If you can't understand it in plain English, what makes you think you'll >>be any less confused in "electronics English", whatever that may be? >> >>The point I was making was that your statement that 6.5 digit >>multimeters aren't needed is wrong, since without one you wouldn't be >>able to determine the accuracy of the cheap multimeter. >> >>JF > >By his logic, you wouldn't need a wife if your neigbor has one. If you were any more retarded, I'd say you were from somewhere in Europe. Too late!
From: Archimedes' Lever on 12 Mar 2010 21:56 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.
From: Archimedes' Lever on 12 Mar 2010 21:57 On Fri, 12 Mar 2010 15:03:42 -0600, John Fields <jfields(a)austininstruments.com> wrote: >On Fri, 12 Mar 2010 20:15:16 GMT, Jan Panteltje ><pNaonStpealmtje(a)yahoo.com> wrote: > >>On a sunny day (Fri, 12 Mar 2010 09:33:25 -0800) it happened D from BC >><myrealaddress(a)comic.com> wrote in <MPG.26041ac522f727379896f0(a)209.197.12.12>: >> >>>In article <hndc5b$37k$1(a)news.albasani.net>, pNaonStpealmtje(a)yahoo.com >>>says... >>>> >>>> On a sunny day (Thu, 11 Mar 2010 17:56:35 -0800) it happened D from BC >>>> <myrealaddress(a)comic.com> wrote in <MPG.26033f321480b139896e5(a)209.197.12.12>: >>>> >>>> >6.5 digit multimeters sell around $1000.00. >>>> >For electronics development, are these $1000 multimeters really >>>> >necessary? >>>> >What are they good for? >>>> >>>> They are not needed, all you need is a 5 Euro multimeter, >>>> and in extreme cases a precise reference. >>>> That means if you use one of those reference chips, you borrow >>>> the very accurate multimeter for a day, measure your reference chip, >>>> write it down, and use that to calibrate your cheap multimeter, >>>> or o compute it's real value, >>>> Saved: 1000$ >>>> >>>> Of course there are exceptions, >>>> but in places where that counts they usually have a lot of ++++expensive stuff anyways. >>>> Usually places where nothing really useful is done, like in CERN, or ITER, or LIGO, >>>> etc. >>> >>>How about mohm measurements? Maybe that's handy. >>>My DMM only goes to 0.1 ohm. >>>I thought of measuring DCR of coils or pcb trace resistance for sim >>>accuracy. >> >>I have a controlled current souce. >>Stuff 1 A through the .1 resistor and measure the voltage drop? > >--- >And you've determined the accuracy of the current source and the >resistor, how??? > >JF Not to mention the accuracy (or lack thereof) of the meter used to "verify" things with. Even a 6.5 digit meter can be far enough off to make ANY measurement a best guess.
From: UltimatePatriot on 12 Mar 2010 22:28
On Fri, 12 Mar 2010 12:30:31 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote: >They are not needed, all you need is a 5 Euro multimeter, >and in extreme cases a precise reference. You're an idiot. You could set the meter to match the reference reading at ONE point of measure. That does not mean, in any way shape or form, that the meter will be accurate at ANY other value, ever! |