Guys, I need some advice. I just bought a very nice Triplett 630-A VOM and need to know what to do about the batteries.

The manual calls for a 1.5V battery, which should be no problem. From the schematic, it looks like that battery hanldes the three lower resistance ranges (x1, X10 and X1000).

The manual also calls for a 30V battery (Eveready 413), which is a problem. As I read the schematic, this battery comes into play only on the top resistance range (x100,000). Am I correct? Also, does anyone know of any work-arounds that would enable me to use that top range? I was thinking of thee 9V batteries in series but I don't think I have room.

As always, your advice is greatly appreciated.


Joe Connor

I'm just playing on old forum memory not having any Triplett meters, but that is what guys do for the 30 volt battery nowadays- three 9 volters. I guess there is room to fit them inside and they work fine.

-Mark-

Mark:

I just checked and the 30V Eveready 413 is still made and still available. In fact, Radio Shack sells it (on-line only). Wow, that's like walking into a store and buying '01A tubes over the counter!

Joe Connor

I think guys just use the 9 volt batteries as they are easier to get. That is good to know the single 30 V is still available. It is for the high ohms range, and from what I gathered the battery (or batteries if you rig in 9 volt ones) lasts several years.

-Mark-

I have two Triplett's on the bench with dead 30 volt batteries. Of course, I needed the highest ohm range to do some measurements so quickly grabbed the leads from a small variable HP supply I had handy, and clip-leaded them to the 30 volt battery terminals. Worked fine. Price on the 30 volt batteries from several sources varied around $18 each. I may just bring the 30 volt battery terminal connections with some leads and clips out of the case if I need to do this again or I may try the three 9 volt battery route.

Pete

If you don't need to use the highest Ohms range (X100,000), then you don't necessarily even need to load the 30V battery. Joe, I will email to you a couple pictures where I made a 30V battery pack that fits inside the case. It is 3ea 9V's clipped together, and a Radio Shack 2-AA holder that clips to an end 9V clip; the pack is then stuck in place using adhesive-backed velcro; so it's easy to remove or to replace a battery. If the 3 9V's are fresh enough, then you may not even need the two AA's. It's a money question of whether to buy the real 30V battery. If you store the VOM for more than several months, then be sure to first remove the batteries...to prevent corrosion damage.

All above sounds like good advice.

I have had good luck at "Batteries +", both with price and stock freshness. They usually are likely to have a lot of "odd ball" types, except for the replacement for Burgess? K9 for some Simpsons (series AFP-1). They have a smaller version that might work for that. That battery is ALSO a 30 volt, IIRC. Would one of those work?

Charles

Actually, Charles, I called my local Batteries Plus store and they said they could easily order the Eveready 413 (30V).

Joe Connor

The battery is available on ebay for $12.95

http://shop.ebay.com/i.html?_nkw=eveready+413

Alan, alot better than the 30 bucks the RAT shack wants.

Thanks

Fred, a few years ago you wrote a battery conversion article for the Triplett Model 631 VOM/VTVM.
Since I just acquired one, I would love to see the article and any other infor you might have on this Model Triplett. Ihave the manual from BAMA.