Considerations For Selecting Input Ranges - National Instruments AT-MIO/AI E Series User Manual

Chapter 3 Hardware Overview
AT-MIO/AI E Series User Manual
Table 3-3. Actual Range and Measurement Precision, AT-MIO-16XE-10,
Range
Configuration
0 to +10 V
-10 to +10 V
1
The value of 1 LSB of the 16-bit ADC; that is, the voltage
increment corresponding to a change of one count in the ADC
16-bit count.
2
AT-MIO-16XE-10 and AT-AI-16XE-10 only
Note: See Appendix A, Specifications, for absolute maximum
ratings.

Considerations for Selecting Input Ranges

Which input polarity and range you select depends on the expected
range of the incoming signal. A large input range can accommodate a
large signal variation but reduces the voltage resolution. Choosing a
smaller input range improves the voltage resolution but may result in
the input signal going out of range. For best results, you should match
the input range as closely as possible to the expected range of the input
signal. For example, if you are certain the input signal will not be
negative (below 0 V), unipolar input polarity is best. However, if the
signal is negative or equal to zero, inaccurate readings will occur if you
use unipolar input polarity.
AT-AI-16XE-10, and AT-MIO-16XE-50
Gain Actual Input Range
1.0 0 to +10 V
2.0 0 to +5 V
2
5.0 0 to +2 V
10.0 0 to +1 V
2
20.0 0 to +500 mV
2
50.0 0 to +200 mV
100.0 0 to 100 mV
1.0 -10 to +10 V
2.0 -5 to +5 V
2
5.0 -2 to +2 V
10.0 -1 to +1 V
2
20.0 -500 to +500 mV
2
50.0 -200 to +200 mV
100.0 -100 to +100 mV
3-10
Precision
152.59 V
76.29 V
30.52 V
15.26 V
7.63 V
3.05 V
1.53 V
305.18 V
152.59 V
61.04 V
30.52 V
15.26 V
6.10 V
3.05 V
National Instruments Corporation
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