Deutsch   English   Français   Italiano  
<vdrj04$lu3$1@solani.org>

View for Bookmarking (what is this?)
Look up another Usenet article

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...