1940's "Multimeter" - 45V battery - UK Vintage Radio Repair and Restoration Discussion Forum

martiR2R · 25th Sep 2013, 7:58 pm

Just aquired a Precision 834-S Multi-range Volt-Ohm-Milliammeter, made for the US army Signal Corps in 1944, in very good condition, a nice little unit in a neat wooden box. It requires a 45V battery, any advice on how I replicate that? gratefully received.
Martin

Nickthedentist · 25th Sep 2013, 8:13 pm

Perhaps four of those little 12V car alarm fob batteries (e.g. GP27A) in series, maybe?

Or five 9V PP3s if there's room?

Nick.

paulsherwin · 25th Sep 2013, 9:04 pm

Poundland sell cards containing 2 E23A/A23s, an A27 and 2 N/E90s. You could use 4 E23As or A27s to give 48V, which is close enough.

Nickthedentist · 25th Sep 2013, 9:15 pm

And good quality GP27A batteries needn't be expensive either, e.g. http://www.ebay.co.uk/itm/5-x-GP-27A...item43a2c27b44

Phil G4SPZ · 25th Sep 2013, 10:57 pm

Five 9-volt PP3s in series would work if space permits.

I have an Espey multimeter which is similar to the Precision model but mine needed a 30 volt battery, for which I used three PP3s and it works perfectly.

martiR2R · 25th Sep 2013, 11:45 pm

Thanks very much guys. Sad to say, but I'd no idea it was that simple!

25th Sep 2013, 7:58 pm	#1
martiR2R Hexode Join Date: Aug 2012 Location: Preston, Lancashire, UK. Posts: 344	1940's "Multimeter" - 45V battery Just aquired a Precision 834-S Multi-range Volt-Ohm-Milliammeter, made for the US army Signal Corps in 1944, in very good condition, a nice little unit in a neat wooden box. It requires a 45V battery, any advice on how I replicate that? gratefully received. Martin __________________ BVWS Member (lapsed!)

25th Sep 2013, 8:13 pm	#2
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,864	Re: 1940's "Multimeter" - 45V battery Perhaps four of those little 12V car alarm fob batteries (e.g. GP27A) in series, maybe? Or five 9V PP3s if there's room? Nick.

25th Sep 2013, 9:04 pm	#3
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,967	Re: 1940's "Multimeter" - 45V battery Poundland sell cards containing 2 E23A/A23s, an A27 and 2 N/E90s. You could use 4 E23As or A27s to give 48V, which is close enough.

25th Sep 2013, 9:15 pm	#4
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,864	Re: 1940's "Multimeter" - 45V battery And good quality GP27A batteries needn't be expensive either, e.g. http://www.ebay.co.uk/itm/5-x-GP-27A...item43a2c27b44

25th Sep 2013, 10:57 pm	#5
Phil G4SPZ Dekatron Join Date: Apr 2005 Location: Bewdley, Worcestershire, UK. Posts: 4,748	Re: 1940's "Multimeter" - 45V battery Five 9-volt PP3s in series would work if space permits. I have an Espey multimeter which is similar to the Precision model but mine needed a 30 volt battery, for which I used three PP3s and it works perfectly. __________________ Phil Optimist [n]: One who is not in possession of the full facts

25th Sep 2013, 11:45 pm	#6
martiR2R Hexode Join Date: Aug 2012 Location: Preston, Lancashire, UK. Posts: 344	Re: 1940's "Multimeter" - 45V battery Thanks very much guys. Sad to say, but I'd no idea it was that simple! __________________ BVWS Member (lapsed!)