Measurement-computing UL for NI LabVIEW Manual do Utilizador descarregar pdf (Página 17)

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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