Paying closer attention to the parenthesis this time, I think you are right.
On 27 September 2013 13:21, Cor van de Water <cwa...@proxim.com> wrote: > Manfred, > I expect that the accuracy is symmetric, in other words it is > +/-(1.5% + 8) so 300A can be displayed as a value between 287.5 and > 312.5 > which is 300 +/- 12.5 or a total accuracy of about 4% > > Cor van de Water > Chief Scientist > Proxim Wireless Corporation http://www.proxim.com > Email: cwa...@proxim.com Private: http://www.cvandewater.info > Skype: cor_van_de_water Tel: +1 408 383 7626 > > > -----Original Message----- > From: ev-boun...@lists.evdl.org [mailto:ev-boun...@lists.evdl.org] On > Behalf Of Manfred Bartz > Sent: Wednesday, September 25, 2013 1:07 AM > To: Electric Vehicle Discussion List > Subject: Re: [EVDL] AC _DC amp meter > > The datasheet is here: http://www.farnell.com/datasheets/43992.pdf > According to that: > Range Resolution Accuracy translates to > 66.00A (DC) 0.01A (1.5%+12) reading+-1.5% + 0.12A > 1000.00A (DC) 1.00A (1.5%+8) reading+-1.5% + 8.00A > 66.00A (AC) 0.01A (2.0%+12) reading+-2.0% + 0.12A > 1000.00A (AC) 1.00A (2.0%+8) reading+-2.0% + 8.00A > > So, for 300A actual DC current, the meter could display anything from > 295.5A to 312.5A > I suppose that is reasonable for a meter in that price class. > Repeatability might be better. > > -- Manfred > > > On 25 September 2013 12:34, Morgan LaMoore <morg...@gmail.com> wrote: >> >> What do you mean by "fairly accurate down to thousands"? Do you mean > you >> want enough accuracy to read milli-amps? If so, you won't get that in > an >> affordable clamp-on amp-meter. >> >> That Tenma clamp meter doesn't have very clear specifications: it > lists the >> accuracy for DC current as "+/-(1.5%+8)", which means up to 1.5% > error, >> plus eight counts. However, they never tell you how big a count is. >> >> Assuming a count is one digit of the display and the 0-40A range lists >> current as 40.00A, then 8 counts would be 80mA, so your error would be > up >> to 1.5% plus 80mA. However, it could be an offset of 800mA, or even 8A > on >> the 1000A scale. >> >> -Morgan LaMoore >> >> >> >> On Sun, Sep 22, 2013 at 6:35 PM, Hart Penn <hartp...@verizon.net> > wrote: >> >> > I have the Tenma 72-9485 AC/DC clamp meter that seems to be fairly >> > accurate, >> > comes with nice probe set, manual and case for $139 from > MCMElectronics >> > http://www.mcmelectronics.com/product/TENMA-/72-9485. It's a little > more >> > than you want to spend but well worth the extra forty bucks. I've > tested it >> > in my EV 12V env (0-20A) and the HV env (0-500A) with good results > and have >> > two other instrument ammeters that concur with the clamp meter > readings. >> > >> > My $0.02, >> > Hart >> > >> > >> > -----Original Message----- >> > From: ev-boun...@lists.evdl.org [mailto:ev-boun...@lists.evdl.org] > On >> > Behalf >> > Of Peakfoto Digital Photo Still n Video >> > Sent: Sunday, September 22, 2013 7:14 PM >> > To: ev@lists.evdl.org >> > Subject: [EVDL] AC _DC amp meter >> > >> > Am looking for a clamp on meter capable of at least 100 DC amps + > and >> > fairly accurate down to thousdands . With" AMPS max hold" and would > like >> > to >> > ?? pay less than $100 . >> > with Good Rubber leads that can be pointed tips or agligator . >> > >> > anyideas? >> > >> > >> > _______________________________________________ >> > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> > http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> > For EV drag racing discussion, please use NEDRA >> > (http://groups.yahoo.com/group/NEDRA) >> > >> > _______________________________________________ >> > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> > http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> > For EV drag racing discussion, please use NEDRA ( >> > http://groups.yahoo.com/group/NEDRA) >> > >> > >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130924/13c9 > 1667/attachment.htm> >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) >> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
