Measurement-computing UL for NI LabVIEW Bedienungsanleitung PDF herunterladen (Seite 47)

Universal Library Virtual Instruments (VIs) Signal conditioning VIs

ToEng.VI

Changed R5.4 ID

Converts a single A/D count value to an equivalent voltage value, or converts an array of A/D counts to an

array of equivalent voltage values.

Change at revision 5.4 to support processing of single values and arrays of values.

Summary:

Inputs: BoardNum - The board number assigned when installed with InstaCal. Can be 0 to

100.

Range - A/D range to use in conversion

AD Data - A/D count value returned from an A/D board

Outputs:

EngUnits - Equivalent voltage (or current) value returned to this variable

ErrCode - Error code. See ErrMsg.VI

Arguments:

BoardNum The board number associated with an A/D board when it was installed with

InstaCal. This function uses the board number to determine whether to do a 12-bit

or 16-bit conversion.

Range A/D voltage (or current) range. Some A/D boards have programmable voltage

ranges, others set the voltage range via switches on the board. In either case the

selected range must be passed to this function. Each A/D board supports different

voltage and/or current ranges. 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 the list of ranges

supported by each board.

AD Data A/D measurement in binary counts to be converted to engineering units.

EngUnits The voltage (or current) value that is equivalent to AD Data is returned to this

variable. The value will be within the range specified by the

Range argument.

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 Bedienungsanleitung Seite 47