Measurement-computing UL for NI LabVIEW Manual do Utilizador descarregar pdf (Página 83)

Universal Library Virtual Instruments (VIs) Streamer File VIs

Streamer File VIs

FileAInScan.VI

Scan a range of A/D channels and store the samples in a disk file. This VI reads the specified number of A/D

samples at the specified sampling rate from the specified range of A/D channels from the specified board. If

the A/D board has programmable gain then it sets the gain to the specified range. The collected data is

returned to a file in binary format. Use FileRead.VI to load data from that file into an array. Refer to the

board-specific information contained in the Universal Library User's Guide (available on our web site at

www.mccdaq.com/PDFmanuals/sm-ul-user-guide.pdf

) to determine if this function is supported on your

board.

Summary:

Inputs: BoardNum [U32] - The board number assigned when installed with InstaCal. Can

be 0 to 100.

LowChan [I32] - First A/D channel of scan.

HighChan [I32] - Last A/D channel of scan.

Count [I32] - Number of samples to collect.

Rate [I32] - Sample rate in samples per second (Hz) per channel.

Range [I32] - Range code.

FileName [abc] - Name of disk file.

ExtClock [TF] - External (True) or internal clock (False).

DTConnect [TF] - DT connect option (True). No DTConnect is (False).

ExtTrigger [TF] - External trigger (True). Internal is (False).

Outputs:

Rate - Actual sampling rate

ErrCode - Error code. See ErrMsg.VI

Arguments:

BoardNum The board number associated with a board when it was installed with InstaCal. The

specified board must have an A/D.

LowChan First A/D channel of scan.

HighChan Last A/D channel of scan.

Low/High 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 8 channels for differential, 16 for

single-ended mode.

Count Specifies the total number of A/D samples that will be collected. If more than one

channel is being sampled then the number of samples collected per channel is

equal to

Count/(HighChan - LowChan + 1).

Rate (input) The maximum sampling rate depends on the A/D board that is being used.

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Measurement-computing UL for NI LabVIEW Manual do Utilizador Página 83