Chapter 4 Analog Input
© National Instruments 4-3 X Series User Manual
MIO X Series devices use a calibration method that requires some codes
(typically about 5% of the codes) to lie outside of the specified range. This
calibration method improves absolute accuracy, but it increases the nominal
resolution of input ranges by about 5% over what the formula shown above
would indicate.
Choose an input range that matches the expected input range of your 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 more information about setting ranges, refer to the NI-DAQmx Help or
the LabVIEW Help.
Table 4-1 shows the input ranges and resolutions supported by each MIO
X Series device.
Table 4-1. MIO X Series Device Input Range and Nominal Resolution
MIO X Series Device Input Range
Nominal Resolution Assuming
5% Over Range
NI 632x/634x –10 V to 10 V 320 μV
–5 V to 5 V 160 μV
–1 V to 1 V 32 μV
–200 mV to 200 mV 6.4 μV
NI 6351/6353/6361/6363 –10 V to 10 V 320 μV
–5 V to 5 V 160 μV
–2 V to 2 V 64 μV
–1 V to 1 V 32 μV
–500 mV to 500 mV 16 μV
–200 mV to 200 mV 6.4 μV
–100 mV to 100 mV 3.2 μV
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