National Instruments DAQ X Series User Manual

Chapter 4 Analog Input
© National Instruments 4-43 X Series User Manual
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 4-5 shows the input ranges and resolutions supported by the
Simultaneous MIO X Series device family.
Working Voltage Range
On most Simultaneous MIO X Series devices, the PGIA operates normally
by amplifying signals of interest while rejecting common-mode signals
under the following three conditions:
• The common-mode voltage (V
cm
), which is equivalent to subtracting
AI <0..x> GND from AI <0..x>–, must be less than ±10 V. This V
cm
is
a constant for all range selections.
• The signal voltage (V
s
), which is equivalent to subtracting AI <0..x>+
from AI <0..x>–, must be less than or equal to the range selection of
the given channel. If V
s
is greater than the range selected, the signal
clips and information are lost.
• The total working voltage of the positive input, which is equivalent to
(V
cm
+ V
s
), or subtracting AI <0..x> GND from AI <0..x>+, must be
less than ±11 V.
If any of these conditions are exceeded, the input voltage is clamped until
the fault condition is removed.
Table 4-5. Simultaneous MIO X Series Device Input Range and Nominal Resolution
Simultaneous MIO
X Series Device
Input Range
Nominal Resolution Assuming
5% Over Range
NI 6356/6358/6366/6368 –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
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National Instruments DAQ X Series Specifications

General

Brand	National Instruments
Model	DAQ X Series
Category	I/O Systems
Language	English