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Author
MHajduk

Joined: 30 Mar 2006
Posts: 6038
Location: Poland
MHajduk
shoorick wrote:
using metal caliper you can measure battery insulated with thin polyethilen, obviously it may be piece of packing bag or similar
Yeah, I also thought about that. The ideal solution for all possible purposes would be metal calipers with ceramic coating on the jaws as an insulator. This way we could reach two goals at once: accuracy of the metal calipers and safety when there would be need to measure such elements as batteries, accumulators etc.

I wonder if such kind of calipers exists at all.
08 Jun 2018, 11:15
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17472
revolution
If you can find some accurately made flat insulator then you can use that across one of the jaws. Then, assuming you have a digital caliper, just use the "zero" button to do the automatic subtraction. The insulator would need to be of even thickness throughout and be very flat with no bumps or waves. Random bits of plastic or paper might okay if accurate readings are not required.
08 Jun 2018, 11:24
MHajduk

Joined: 30 Mar 2006
Posts: 6038
Location: Poland
MHajduk
revolution wrote:
If you can find some accurately made flat insulator then you can use that across one of the jaws. Then, assuming you have a digital caliper, just use the "zero" button to do the automatic subtraction.
That's interesting solution. So, it's something like calibration of the electronic balance, isn't it?
08 Jun 2018, 11:30
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17472
revolution
The digital calipers are really easy to use. Set your zero point and you can go both negative and positive. Of course most usage is when zero means the jaws are closed and we only get positive readings. But when you have something extra in the jaws, like an insulator, then you can easily subtract that from the reading by re-zeroing.
08 Jun 2018, 11:42
shoorick

Joined: 25 Feb 2005
Posts: 1607
Location: Ukraine
shoorick
measure any insulator with the same caliper, then measure it both with battery, finally take the difference i thought about this when suggest thin polyethilen, but then supposed the thickness of such film is much less then tolerance of battery size
08 Jun 2018, 12:41
MHajduk

Joined: 30 Mar 2006
Posts: 6038
Location: Poland
MHajduk
As far as I know, some models of electronic calipers and simple metal calipers are sold in comparable prices, so it would be reasonable to get electronic ones.
08 Jun 2018, 12:55
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17472
revolution
There are electronic ones and there are electronic ones. Some have poor resolution and poor accuracy. Some are made with plastic which flexes and warps easily. Some don't have the small wheel to ensure even pressure. Some drift in calibration when the temperature changes. Etc. etc. etc. You get what you pay for probably.
08 Jun 2018, 13:07
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