© National Instruments 27 NI sbRIO-960x/962x/963x OEM Instructions & Specifications
results in a larger LSB and, therefore, lower resolution. A smaller input
range improves the resolution, but large input signals may go out of range.
For more information about selecting ranges, refer to the LabVIEW Help.
Table 5 shows the input ranges and resulting LSB sizes for AI channels on
each NI sbRIO device.
Working Voltage Range
The PGIA on NI sbRIO devices operates normally by amplifying signals of
interest while rejecting common-mode signals under the following three
conditions:
• The common-mode voltage (Vcm), which is equivalent to subtracting
AIGND from AI–, must be less than ±10 V. Vcm is a constant for all
range selections.
• The signal voltage (Vs), which is equivalent to subtracting AI+ from
AI–, must be less than or equal to the range selection of the given
channel. If Vs is greater than the range selected, the signal clips and
information is lost.
• The total working voltage of the positive input, which is equivalent to
(Vcm + Vs), or subtracting AIGND from AI+, must be less than the
maximum working voltage specified for that range. Refer to the
NI sbRIO-9626/9636 section for the maximum working voltage for
each range.
If any of these conditions are exceeded, the input voltage is clamped until
the fault condition is removed.
Table 5. NI sbRIO Device Input Range and Resolutions
Device Input Range Bit Resolution LSB Size
NI sbRIO 9623/9633 0 V to 5 V 12-bit 1.22 mV
NI sbRIO 9626/9636
–10 V to 10 V
16-bit
320 µV
*
–5 V to 5 V 160 µV
*
–2 V to 2 V 64 µV
*
–1 V to 1 V 32 µV
*
*
Includes 5% overranging.
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