Chapter 3
Hardware Overview
©
National Instruments Corporation
3-7
PCI-MIO E Series User Manual
Table 3-3 shows the overall input range and precision according to the
input range configuration and gain used.
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, 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, you will get inaccurate readings if you use
unipolar input polarity.
Table 3-3. Actual Range and Measurement Precision,
PCI-MIO-16XE-10 and PCI-MIO-16XE-50
Range
Configuration
Gain
Actual Input Range
Precision
1
0 to +10 V
1.0
2.0
5.0
2
10.0
20.0
2
50.0
2
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
152.59
µ
V
76.29
µ
V
30.52
µ
V
15.26
µ
V
7.63
µ
V
3.05
µ
V
1.53
µ
V
-10 to +10 V
1.0
2.0
5.0
2
10.0
20.0
2
50.0
2
100.0
-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
µ
V
152.59
µ
V
61.04
µ
V
30.52
µ
V
15.26
µ
V
6.10
µ
V
3.05
µ
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
PCI-MIO-16XE-10 only
Note:
See Appendix A, Specifications, for absolute maximum
ratings.
