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Path: ...!feeds.phibee-telecom.net!weretis.net!feeder8.news.weretis.net!reader5.news.weretis.net!news.solani.org!.POSTED!not-for-mail From: Jan Panteltje <alien@comet.invalid> Newsgroups: sci.electronics.design Subject: Re: Extech EX410A DVM Don't Buy Date: Sat, 05 Oct 2024 14:37:55 GMT Message-ID: <vdrj04$lu3$1@solani.org> References: <814ufjd9lg7p2mago36u2fk6njs0gtafq8@4ax.com> <7so0gjtispsfqvv9klhq9vlsgfpqd1vs2m@4ax.com> <vdqna7$455$1@solani.org> <bdd2gj50jheq0r2uv7c9qfvidc12bg91g4@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; ISO-8859-15 Content-Transfer-Encoding: 8bit Injection-Date: Sat, 5 Oct 2024 14:37:56 -0000 (UTC) Injection-Info: solani.org; logging-data="22467"; mail-complaints-to="abuse@news.solani.org" User-Agent: NewsFleX-1.5.7.5 (Linux-5.15.32-v7l+) Cancel-Lock: sha1:Tg6DTPet3EDOhW693c9T7/9C7pI= X-User-ID: eJwFwQkRADAIAzBLMGh3k8PrX8ISGJV1naBjsd0NRqbG3R2tsImDhzxS/sAnW7J2bsqImZaGEOlz2C1qH3oRFcg= X-Newsreader-location: NewsFleX-1.5.7.5 (c) 'LIGHTSPEED' off line news reader for the Linux platform NewsFleX homepage: http://www.panteltje.nl/panteltje/newsflex/ and ftp download ftp://sunsite.unc.edu/pub/linux/system/news/readers/ Bytes: 6506 Lines: 111 On a sunny day (Sat, 05 Oct 2024 06:35:12 -0700) it happened Jeff Liebermann <jeffl@cruzio.com> wrote in <bdd2gj50jheq0r2uv7c9qfvidc12bg91g4@4ax.com>: >On Sat, 05 Oct 2024 06:45:27 GMT, Jan Panteltje <alien@comet.invalid> >wrote: > >>On a sunny day (Fri, 04 Oct 2024 16:07:24 -0700) it happened Jeff Liebermann >><jeffl@cruzio.com> wrote in <7so0gjtispsfqvv9klhq9vlsgfpqd1vs2m@4ax.com>: >> >>>On Thu, 03 Oct 2024 14:46:46 -0700, john larkin <jl@glen--canyon.com> >>>wrote: >>> >>>>Extech EX410A DVM Don't Buy >>>> >>>>The auto power off is incredibly stupid. I'm going to throw mine away >>>>and get something usable. >>> >>>What don't you like about the auto power off feature in the EX410A? >>> >>>EX410: >>><https://www.flir.com/products/ex410a/> >>> >>>I have two Extech EX470 DMM's: >>><https://www.flir.com/products/ex470a> >>>Presumably, the auto power off function is similar. >>> >>>I've had both DMM's for over 10 years and use them often. I've had no >>>difficulties except with various 9V batteries. I got tired of >>>replacing them. Over the last 5 or so years, I've experimented with >>>two types of rechargeable Li-Ion 9V batteries. >>> >>>The ones without an internal battery charger had self-discharge >>>problems: >>><https://www.ebay.com/itm/304501384792> >>>They work, but I wouldn't recommend them. >>> >>>The batteries I'm using now, which have a built in charger, are >>>better: >>><https://www.ebay.com/itm/386563315011> >> >>Interesting, did not know that existed. > >Eventually, there will be batteries and cells available in every >combination of size and chemistry. Whether all combinations are >usable, practical or economical, is a different problem. I didn't >know Li-Ion AAA cells existed until after I searched for them. One >day, they magically appeared on eBay and Amazon. > >Incidentally, you might find these web pages of interest: >"Low current discharge of batteries" ><https://lygte-info.dk/info/BatteriesLowCurrentDischarge%20UK.html#9V,_Panasonic_Pro_Power> ><https://lygte-info.dk/info/BatteriesLowCurrentDischarge2%20UK.html> >Most of the battery related forums emphasize high current >applications, such as EV's, power tools, drones, flashlights, LED >lighting, etc, while low current devices, such as multimeters, >component testers, ESR meters, TDR's, etc seem to be neglected. > >I think LiFePO4 (lithium iron phosphate) is a better solution for test >equipment and TV remote controls. With a nominal 3.2V voltage, a >single AA or AAA cell should substitute well for the usual two AA or >AAA cells in series arrangement: ><https://www.ebay.com/itm/387366292333> >I'm trying to resist ordering some cells and creating yet another >project that I can't finish. > >>OTOH my multimeter lasts years on a 9V battery from the supermarket here.. >>meter switches off automatically, but I switch it of by hand almost always. >>means it is never left on for more than 24 hours.. >> https://panteltje.nl/pub/chinese_multimeter_img_3159.jpg > >My main goal is to eliminate non-rechargeable batteries from my life, >especially alkaline cells, which tend to leak and corrode terminals, >wires and PCB's: ><https://www.learnbydestroying.com/jeffl/crud/Kirkland-AAA-leak.jpg> > >>I use this too sometimes: >> https://www.conrad.nl/nl/p/voltcraft-vc-320-stroomtang-digitaal-cat-ii-600-v-cat-iii-300-v-weergave-counts-2000-1307543.html >> >>Have a Voltcraft soldering station too, now for > 20 years, is OK. >> https://panteltje.nl/pub/soldering_iron_LCD_display_IMG_5456.JPG >>never a problem... > >I have a box full of Weller WTCP series (TC202 base) very used >soldering stations along with a collection of half burned out tips. ><https://www.google.com/search?q=weller+wtcpt&udm=2> >I repaired what I could and produced about 15 working soldering >stations from the parts. I sold most of these, but still have and use >about 4 of them. I've had them since early college, which makes them >about 55 years old. I remember the Wellers from work, had one for years at home too. As to rechargable AAA and AA I use 'Eneloop' batteries, self discharge is almost zero, nice in a small flashlight (always light even if not used in ages) in TV remotes, even in my gamma spectrometer. I have some AA lifepo4 and a 250 Ah big 12V lifepo4 pack with a 2 kW 50 Hz DC/ AC converter that can power my fridge or even a cooking plate or a microwave if needed. https://panteltje.online/pub/250_Ah_12V_to_230V_sinewave_IXXIMG_0796.JPG Flexible solar cells I can lay out in the garden... and a charger for the battery pack. I do use a lipo in my weather station, one 3V lipo + a short (Ohm) AAA battery to replace 2 1.5 V batteries, same in one remote. The weather station runs a few month on that before it needs a re-charge. The remote I do not remember having recharged in a few years... And have several lipo 2 and 3 cell models for my drones: https://panteltje.nl/pub/3cell_40C_ebay_lipo_IMG_6682.JPG And ofcourse many of these in different projects: https://panteltje.nl/pub/SWR_bridge_wired_IMG_5013.JPG https://panteltje.online/pub/SWR_bridge_on_dummy_load_IMG_5046.JPG As a kid I started with 4.5 V batteries...