Measurement Computing UL for NI LabVIEW - Manual (Page 17)

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Universal Library Virtual Instruments (VIs)
Analog Input VIs
AIn.VI
Reads an A/D input channel. This VI reads the specified A/D channel from the specified board. If the A/D
board has programmable gain, it sets the gain to the specified range. The raw A/D value is converted to an
A/D value and returned to
DataValue .
Summary:
Inputs: BoardNum [U32] - The board number when installed with InstaCal; can be 0 to
100.
Channel [I32] - A/D channel number
Range [I32] - A/D Range
Outputs: DataValue [U16] - Value of A/D sample
ErrCode [I32] - Error code. See ErrMsg.VI on page 97.
Arguments:
BoardNum The board number associated with a board when it was installed with InstaCal. The
specified board must have an A/D. BoardNum can be from 0 to 100.
Channel The maximum allowable channel depends on which type of A/D board is being
used. For boards that have both single ended and differential inputs, the maximum
allowable channel number also depends on how the board is configured. For
example, a PCI-DAS6025 has eight channels for differential, 16 for single-ended
input mode.
Range If the selected A/D board does not have a programmable gain feature, this
argument is ignored. If the A/D board does have programmable gain, set the Range
argument to the desired A/D range.
The Range input values table on page 19 lists the constants you can use in the
Range argument for most functions. Not all A/D boards support the same A/D
ranges. Refer to the board’s hardware manual for a list of supported A/D ranges.
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