Hi ya, I got an old TMK multimeter. The 15v battery for the highest resistance range needs replacing. It is a number 504. Any suggestions please on a cheap and compact way to substitute this battery? Thanks, Dave
Not familiar with TMK. Assuming it is a bridge circuit, and there's enough room, two nine volt batteries in series may work. Check the schematic to see if the resistors can dissipate the power (particularly the zero adjust)
504 batteries are still stocked and available $7 each (US)Good project there, if you want to fool around. DC/DC converter running from a D battery (assuming it uses D for the low ranges).
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Or 5 CR123 3V lithium cells in series. You might even be able to use lithium coin cells.
-- Jim Yanik jyanik at kua.net
Thanks Jim, actually that's an idea I never thought of ( 2 x 9v bats). Bit of tinkering etc ...yes! Lithium I think too expensive though. Thanks, Dave
"David Sewell" wrote in news:dqpagp$9qh$ snipped-for-privacy@news8.svr.pol.co.uk:
The 2 9V battery idea was the other poster's idea.
The 123 cells are only expensive if you buy them from ordinary sources. check out Surefire's prices in quantity.
Lithium coin cells would give the best fit.
-- Jim Yanik jyanik at kua.net
If this is the same battery that is used in the Triplett 310, it's still available from test equipment dealers.
The Triplett 310 is a living dinosaur, I mean classic. :)
Thanks again Jim. Strange, You are the only reply to my question showing on my screen. So I thought it was your idea. David
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