Appendix A - Specifications
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Export allSpecifications at 25 degrees C and Vusb/Vext = 5.0V, except where noted.
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LabJack
Measurement & Automation Simplified
Specifications at 25 degrees C and Vusb/Vext = 5.0V, except where noted.
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Comments
#1
Looking at the Differential Linearity Error, how does "number of counts" translate into voltage error? Do we assume the Vref of the ADC is 5V? If so, for a 12-bit ADC, then one LSB = one count = Vref/2^N =5/4096 = 1.22mV. So that's the DNL. The INL error is 0.02% of FS = 0.0002*5=1mV. Do those two errors simply add up to give 2.22mV of total non-linearity error?
Thanks for the help.
#2
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.