Measurement-computing UL for NI LabVIEW Instrukcja Użytkownika Pobierz pdf (Strona 26)

Universal Library Virtual Instruments (VIs) Analog Input VIs

Range If the selected A/D board does not have a programmable gain feature, this

argument is ignored. Otherwise the

Range can be set to any of the ranges that are

supported by the selected A/D board. See the "

Range input values" table on page

19 for valid values.

Refer to 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) for a list of the A/D ranges supported by each board.

ConvertData The data is collected into a "circular" buffer. When the data collection is complete,

the data is in the wrong order. If using the

CONVERTDATA option (True), when

data acquisition is complete, the data is automatically rotated into the correct order

and converted to 12-bit values. Otherwise, you must call ACnvPrDt.VI to rotate

the data.

DTConnect When the DTConnect option (True) is used with this VI, the data from all A/D

conversions is sent out the DT-CONNECT interface. While this VI is waiting for a

trigger to occur, it will send data out the DT-CONNECT interface continuously. If

you have a memory board plugged into the DT-CONNECT interface, use the

ExtMemory option rather than this option.

ExtMemory If using this option (True) to send the data to a connected memory board, you must

use MemRdPrt.VI to read the pre-trigger data from the memory board later. If you

use the MemRead.VI, the data will not be in the correct order. Every time this

option is used it will overwrite any data that is already stored in the memory board.

All data should be read from the board (with MemRdPrt.VI before collecting any

new data. The Mega-Fifo memory must be fully populated to use the APretrBg.VI

or APretrFg.VI.

DataArray

The data array for the pretrigger data.

PretrigCount [ Actual number of pre-trigger A/D samples collected.

TotalCount Total number of A/D samples collected.

Rate Actual sample rate in scans per second.

ErrCode Error code returned from the Universal Library. Zero if no error occurred. Use the

ErrMsg VI to convert

ErrCode into a readable string.

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Measurement-computing UL for NI LabVIEW Instrukcja Użytkownika Strona 26