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From: Martin Rid <martin_riddle@verison.net>
Newsgroups: sci.electronics.design
Subject: Re: Extech EX410A  DVM  Don't Buy
Date: Tue, 8 Oct 2024 19:14:04 -0400 (EDT)
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Jeff Liebermann <jeffl@cruzio.com> Wrote in message:r
> 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 nodifficulties except with various 9V batteries.  I got tired ofreplacing them.  Over the last 5 or so years, I've experimented withtwo types of rechargeable Li-Ion 9V batteries.  The ones without an internal battery charger had self-dischargeproblems:<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, arebetter:<https://www.ebay.com/itm/386563315011>If your complaint about the auto power off feature involves someleakage current when the auto power off feature has turned off, thesebatteries might help.  I just measured the battery drains in my Extech EX470.  Time to power off:  30 mins  Operating battery current:  5.4 ma  Power off after timeout:  0.02 ma  Power off using rotary switch: <0.01 maI also have a Uni-T UT210E.  <https://meters.uni-trend.com/product/ut210-series/>I bought it for automotive use because of the "clamp on" DC Ammeterfeature.  3 DC scales (2, 20, 100 Amps DC) using a hall effect device.It's sensitive to nearby metal objects at <1A DC.  Switching frombetween AC and DC is not logical.  When switching ranges, it alsoswitches from DC -> AC.  When using the hall effect ammeter, resettingto zero has to be done fairly often.  It uses two AAA alkaline cells.NiMH will barely work due to low voltage.  Li-Ion AAA are availablebut I haven't tried any (yet):<https://www.xtar.cc/aa-aaa-battery.html><https://www.ebay.com/itm/364640309348>Otherwise, I like Uni-T.Also, some hacking is possible:<https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/>-- Jeff Liebermann                 jeffl@cruzio.comPO Box 272      http://www.LearnByDestroying.comBen Lomond CA 95005-0272Skype: JeffLiebermann      AE6KS    831-336-2558

My BK. Lcr meter came with  a lsd 9volt rechargable battery. Like
 the enloop's it should hold a charge for a long time.

Time will tell if it any better  than a nimh standard  cell.

Cheers
-- 


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