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)
