National Instruments DAQ X Series, Руководство пользователя

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Chapter 4 Analog Input
© National Instruments 4-3 X Series User Manual
MIO X Series devices u se a calibration method that req u ires some codes
(typically abo u t 5% of the codes) to lie o u tside of the specified range. This
calibration method improves absol u te acc u racy, b u t it increases the nominal
resol u tion of inp u t ranges by abo u t 5% over what the form u la shown above
wo u ld indicate.
Choose an inp u t range that matches the expected inp u t range of yo u r signal.
A large inp u t range can accommodate a large signal variation, b u t red u ces
the voltage resol u tion. Choosing a smaller inp u t range improves the voltage
resol u tion, b u t may res u lt in the inp u t signal going o u t of range.
For more information abo u t setting ranges, refer to the NI-DAQmx Help or
the LabVIEW Help .
Table 4-1 shows the inp u t ranges and resol u tions s u pported 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 632 x /634 x –10 V to 10 V 320
μ
V
–5 V to 5 V 160
μ
V
–1 V to 1 V 32
μ
V
–200 mV to 200 mV 6.4
μ
V
NI 6351/6353/6361/6363 –10 V to 10 V 320
μ
V
–5 V to 5 V 160
μ
V
–2 V to 2 V 64
μ
V
–1 V to 1 V 32
μ
V
–500 mV to 500 mV 16
μ
V
–200 mV to 200 mV 6.4
μ
V
–100 mV to 100 mV 3.2
μ
V
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