AVO Multimeter

[op9]

I have just bought through Ebay an old AVO Model 7X Panclimatic analogue multimeter. It certainly brought back memories as I was an engineer at sea years ago and it was standard equipment on all British and Australian Merchant ships.

What I'm after are the batteries. For the two lower ohms range it uses a standard 1.5v "C" battery. But for the 1 Meg range it needs 2 x (special sized) 4.5 volt batteries. These two batteries appear to supply separately and the relevant connections are not parallelled or "seriesed" up, so a 9volt battery can't be used.
If these specific 4.5V are no longer available I can probably rig up 3 x AA batteries and make the 4.5V. Rod Nissen.
Combustion & Engineering Diagnostics
nissenr@iprimus.com.au

http://www.canded.com.au

 

[dpc]

I have no idea what these batteries look like, but you might try a camera shop. I believe some of the new electronic cameras use 4.5 V and 6.0 V batteries, so they might have something you could adapt for your application. Otherwise you will have to build it up from standard cells.

 

[jlhmaint]

like dpc said you can get plug in type 4.5v batteries at walmart for cordless phones, cameras, etc also if you search 4.5v batteries on the net you will come up with all kinds of batteries you can order.

 

[busbar]

I don't know about that specific meter, but there are quite a few sizes of cylindrical and button cells available these days. That may be your only out. An advantage seems to be that alkaline cells beat out carbon-zinc for shelf life and fewer electrolyte leaks.

{At least it's not that weird old 22½-volt "transistor-radio" battery Simpsons used to need.}

 

[jbartos]

Suggestion: Check

http://www.metercenter.com/cgi-bin/webshop.cgi?config=avo

etc. for more info