ORIGINAL: choppersrule
EMISSIVITY: I didn't make that up(Yuk-Yuk). It has to do with specific gravity of each material, density of the material, etc.
Example: The motors on a DD may have two different casings, one polished and one not polished. When using a Infrared Heat Gauge, even though they are exactly at the same temperature. The Heat Gauge may read 5 to 10 degrees different, because of the emissivity.
That's why it good/mandatory to take readings of each object, before and after testing to get a very accurate variance in temperature.
MY TEMPERATURE GAUGE:
It's a TGX1, used by O'Donnell Racing and has a function to change the emissivity value. However, it's a pain, only because you have to know the emissivity of the object you're taking temperatures of. That's why it's easier to take a reading before and after, to verify difference in temperature.
All the above holds true with all Infrared Temperature Gauges, they just don't tell ya about it.
Below is a link on some of the emissivity charts.. Every object has a little bit of variance.. It's all Science.
Link:
http://www.omega.com/literature/tran...issivitya.html
Hope this helps ya,
Dave / Choppersrule
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thanks for the link and the good gee wiz info. It was all a very interesting read for me, and I learned a new word =)
on another post someone talked about these batteries. They say they can be discharged to 2v per cell with no perminant damage, so cutt offs and timers are a thing of the past, or so they say. Seems like there has to be a catch. What they are saying just doesn't add up to me, it partly sounds like a TV infomercial. I mean do they have the technology, and that is just how they are marketing it? Or are they streching the truth and making it sound like the miracle battery pack of the future?
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