Measurement-computing UL for NI LabVIEW Manuel d'utilisateur télécharger pdf (Page 22)

Universal Library Virtual Instruments (VIs) Analog Input VIs

Caution! You will generate an error if you specify a total A/D rate beyond the capability of the board.

For example, if you specify LowChan = 0, HighChan = 7

(8 channels total) and Rate = 40,000 and you are using a PCI-DAS6025, you will get an error.

You have specified a total rate of 8 x 40,000 = 320,000. The PCI-DAS6025 is capable of

converting 200,000 samples per second. The maximum sampling rate depends on the A/D

board that is being used. It is also dependent on the sampling mode options.

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

argument will be ignored. Otherwise the gain can be set to any of the following

ranges that are supported by the selected A/D board. Refer to board-specific

information for the list of ranges supported by each 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.

Options For a detailed explanation of the Options field refer to OptAIn.VI on page 30.

The OptAIn.VI must be wired to this input.

InterChannel Delay Delay in seconds between channels in a scan. Negative values indicate that the

interchannel delay will automatically be minimized. Currently, positive values will

result in interchannel delays corresponding to the

Rate sampling rate. For example:

1/(

Rate*(HighChan-LowChan+1)).

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

ErrMsg VI to convert

ErrCode into a readable string.

Important - Read board-specific information in UL User's Guide

In order to understand the functions, read 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). The

example programs should be examined and run prior to attempting any programming of your own.

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Measurement-computing UL for NI LabVIEW Manuel d'utilisateur Page 22