National Instruments AT E Series User Manual
Page 35
Chapter 3
Hardware Overview
© National Instruments Corporation
3-9
Note
You can calibrate the AT-MIO-16XE-10, AT-AI-16XE-10, and AT-MIO-16XE-50
AI circuitry for either a unipolar or bipolar polarity. If you mix unipolar and bipolar
channels in the scan list and you are using NI-DAQ, then NI-DAQ loads the calibration
constants appropriate to the polarity for which AI channel 0 is configured.
The software-programmable gain on these devices increases their overall
flexibility by matching the input signal ranges to those that the ADC can
accommodate. The AT-MIO-16XE-10 and AT-AI-16XE-10 have gains of
1, 2, 5, 10, 20, 50, and 100 and the AT-MIO-16XE-50 has gains of 1, 2, 10,
and 100. These gains are suited for a wide variety of signal levels. With the
proper gain setting, you can use the full resolution of the ADC to measure
the input signal. Table 3-3 shows the overall input range and precision
according to the input range configuration and gain used.
Table 3-3. Actual Range and Measurement Precision for the AT-MIO-16XE-10,
AT-AI-16XE-10, and AT-MIO-16XE-50
Range
Configuration
Gain
Actual Input Range
Precision
1
0 to +10 V
1.0
2
2.0
2
5.0
2
10.0
2
20.0
2
50.0
2
100.0
2
0 to +10 V
0 to +5 V
0 to +2 V
0 to +1 V
0 to +500 mV
0 to +200 mV
0 to 100 mV
152.59 µV
76.29 µV
30.52 µV
15.26 µV
.63 µV
3.05 µV
1.53 µV
–10 to +10 V
1.0
2
2.0
2
5.0
2
10.0
2
20.0
2
50.0
2
100.0
2
–10 to +10 V
–5 to +5 V
–2 to +2 V
–1 to +1 V
–500 to +500 mV
–200 to +200 mV
–100 to +100 mV
305.18 µV
152.59 µV
61.04 µV
30.52 µV
15.26 µV
6.10 µV
3.05 µV
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: Refer to Appendix A, Specifications, for absolute maximum ratings.