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LabJack
Measurement & Automation Simplified
The team at LabJack is driven to make measurement and automation simple and affordable. Located in Lakewood, Colorado, LabJack Corporation builds great hardware and software for industry, government, and education.
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#1
Wiki has general info about DNL and INL. To translate counts into voltage, it depends on the range. If you are using the 0-5 volt range, then your calculation for the weight of 1 12-bit count is correct.
You should not have to add DNL and INL. INL should include DNL. I think the fact that DNL actually looks slight bigger than INL for a 12-bit G=1 measurement is just the limitation of a 12-bit measurement. Both errors together are within 1 count, so we can't look closer to separate them.
Absolute Accuracy includes DNL and INL and other error sources.