Check this out:
Oh, and you gotta love the solar powered model:
Dave.
Check this out:
Oh, and you gotta love the solar powered model:
Dave.
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I have a 20odd year old Fluke 77 and I think I have replaced the battery (9volt) once or twice in that time. Why would you need any more energy than that, kinetic or not?
John G.
I wonder what kind of battery the solar powered rechargable uses.
All the rechargable batteries I've ever had have died sooner than a typical primary cell battery would have in this application.
Sylvia.
Bingo, it's a useless concept. Good auto power off and long battery life in a meter is not rocket science.
Dave.
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Unless its a marketing / gimick ploy. But I'm sure Jaycar wouldn't venture into that arena.
ose
ctView.asp?ID=3DQM1546
Almost all cheapo "solar-powered" calculators in fact have "dummy" solar cells that are not even wired to the circuit. They just use the batteries all the time.
There was a flurry of fake "shake lights" that were actually not powered by shaking at all but by a couple of battteries.
My guess is that the energy requirement of a LCD DMM in voltage or current mode is trivially small and probably about the same as a LCD calculator. Put it in ohms mode, though, and I'm sure that some ranges take several mA.
Tim.
"John G." "David L. Jerkoff"
** Bloody obvious to anyone- the product blurb is a total wind-up.
... Phil
On a sunny day (Wed, 10 Jun 2009 06:26:42 -0700 (PDT)) it happened Tim Shoppa wrote in :
I ahd a credit card sized solar calculator, it had no batteries at all. Indoors it only worked directly onder a 100W desklamp...
And why do they seem to always have an "off" key?
-- John Devereux
Maybe they know something we don't. :-)
Ed
Good question. Maybe dumb people want that? Either on customer or manufacturer side...
My old solar powered Casio FX-991 only has an "on" key which works as a reset, in case the calc has hanged due to insufficient light... Got me through high school, although I remember one physics exam when there was a power outage. Good thing it was short, otherwise I would've been screwed... The calculator really doesn't work in dim light, but OK in normal lightning.
Shoppa
r th=3D
rodu=3D
Ever hear of "Daylight Savings"?
Gees, Phil, you've found you sense of humour. :-)
Probably a "supercapacitor", some ulp devices can run a significant time on a single charge. I have a solar powered calculator with large LCD, its kept on the windowledge on the shady side of the house (not that we get much sun in the UK) its always lasted for everything I've used it for so far.
Almost all cheapo "solar-powered" calculators in fact have "dummy" solar cells that are not even wired to the circuit. They just use the batteries all the time.
My solar calculator got soaked and was dead as a dodo, after a few months on a radiator to dry out it was dry but still dead, a while on the window ledge recharged it good as new, it was about £4.95 - not that pricey for a large LCD model.
Its for when your assistant goes for a tea break - obviously you need an assistant to wind the handle while you point the test prods in the right place.
It seems an odd thing to manufacture after all the trouble Megger went to to design out the hand cranked generator in their insulation/continuity meters!
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