National Instruments 3.21E+04 Manual De Usuario

Chapter 3     Hardware Overview

AT-MIO/AI E Series User Manual

3-8

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 National Instruments Corporation

You can program polarity and range settings on a per channel basis 
so that you can configure each input channel uniquely.

The software-programmable gain on these boards increases their 
overall flexibility by matching the input signal ranges to those that 
the ADC can accommodate.  The AT-MIO-16E-1, AT-MIO-16E-2, 
AT-MIO-64E-3, AT-MIO-16E-10, and AT-MIO-16DE-10 have 
gains of 0.5, 1, 2, 5, 10, 20, 50, and 100 and 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 3-2 shows the overall input range and precision according to 
the input range configuration and gain used.

Table 3-2.     Actual Range and Measurement Precision

0 to +10 V

1.0
2.0
5.0

10.0
20.0
50.0

100.0

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

2.44 mV
1.22 mV

488.28 

µ

V

244.14 

µ

V

122.07 

µ

V

48.83 

µ

V

24.41 

µ

V

-5 to +5 V

0.5
1.0
2.0
5.0

10.0
20.0
50.0

100.0

-10 to +10 V

-5 to +5 V

-2.5 to +2.5 V

-1 to +1 V

-500 to +500 mV
-250 to +250 mV
-100 to +100 mV

-50 to +50 mV

4.88 mV
2.44 mV
1.22 mV

488.28 

µ

V

244.14 

µ

V

122.07 

µ

V

48.83 

µ

V

24.41 

µ

V

1

The value of 1 LSB of the 12-bit ADC; that is, the voltage 

increment corresponding to a change of one count in the ADC 
12-bit count.