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 Post subject: Re: Simpson 260 series 5p help
PostPosted: Nov Mon 25, 2019 1:36 am 
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Joined: Apr Wed 10, 2019 3:48 am
Posts: 402
Moral of the story, as others have suggested, battery and terminals must be in tip top shape.

Happy but confused. Repaired battery terminals but still cant zero, so went to the store and picked up a fresh D battery.
Installed it, and as suggested by a poster here, big difference. Can easily zero the meter, and seems to be working fine. So, whats confusing is that a couple of resistors are way off to the high side, yet the meter seems to be working properly. Maybe someone recalibrated the pots to compensate, despite the resistors that are off? Pretty good meter I suppose.


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 Post subject: Re: Simpson 260 series 5p help
PostPosted: Nov Mon 25, 2019 4:03 am 
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Joined: Apr Wed 10, 2019 3:48 am
Posts: 402
Got bored and decided to build a 15v battery from 2-9v batteries. Used 2 sunbeam batteries from the dollar store, since I was able to separate cells without a problem. I believe duracell has tiny individual aaa shaped cells inside, and has added advantage of being lithium. I pried opened the battery with small cutting plier and removed 1 cell by cutting the soft plastic encapsulation with razor and twisting off the cell. Then, took the plate off of the single cell removed, and placed it on top of the remaining five stack covering the exposed carbon and pressed it tight and sealed it with hot glue. Do the same for the second battery. Solder metal strip across + - joining each pack at the base, and hot glue together. Solder leads + - at the top of the joined pack and test. (Better to solder to plates before you hot glue it together, since will re-melt hotglue). When tested I got 16.8v, and thought that would be too high for this meter. I reduced it by one cell and the voltage dropped to 15.25v. Turns out that was too low, and my meter would not zero. Made adjustments, and got the voltage to 15.8v, and meter zeroed just fine. Then I fit it into the corner of the meter, and soldered leads to battery tabs. Also, coat the exposed metal surfaces with silicone or shoegoo to protect from leaks, avoid hot glue since it could overheat the plate and cause the original hot glue seal to melt causing the plate to move.

Much easier to buy generic 15v battery at amazon, but still have to solder since it will not be the right size, and not sure it will fit. Refine the custom method from sbove, and encapsulate with a custom wrapper for better reproduction.


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