11-21-2008 07:26 PM
The NI page for the 9203 C-module states an accuracy of 0.049 mA on a range of 0-20 mA. (or app. 800 in its -20 +20 mA mode). Is this a typo or is this module really not very accurate?
The operating manual does not mention this accuracy at all, but instead mentions factors such as offset and peak to peak input noise and "INL" on a scale of LSB's.
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11-22-2008 03:09 AM
11-22-2008 06:35 AM
A very clear explanation. Thanks!
It would mean the following: I would attach absolute pressure sensors that yield 4-20 mA on a range of 800-1200 mbar, or 25 mbar per mA. The worst possible reading error would be 0.049*25= 1.225 mbar. And, if I understand Gain error correctly, this would be only at full range. Furthermore, I may expect the real gain and offset error to be more according the "typical" error percentages, since I expect no extreme ambient temperatures during the measurement.