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Universal Library Virtual Instruments (VIs) Signal conditioning VIs

ACnvPrDt.VI

Changed R3.3 RW (MOD)

Converts the raw data collected by APretrFg.VI or APretrBg.VI. APretrBg.VI and APretrFg.VI can return

either raw A/D data or converted data depending on whether or not the CONVERTDATA option was used.

The raw data as it is collected is not in the correct order. After the data collection is completed it must be

rearranged into the correct order. This VI correctly orders the data, starting with the first pretrigger data point

and ending with the last post-trigger point.

Change at revision 3.3 to support multiple background operations.

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

be 0 to 100.

PreTrigCount [I32] - Number of pre-trigger samples

TotalCount [I32] - Total number of A/D samples that were collected

DataArray [U32] - Data and channel tags

Outputs:

DataArray [U32] - Converted data

ChanTags [I16] - Channel tags if available

ErrCode [I32] - 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. Can be 0 to 100.

PreTrigCount Number of pre-trigger samples.

TotalCount Total number of A/D samples that were collected.

DataArray (In) Array of raw samples that require ordering.

DataArray (Out) Array of converted samples ordered with oldest samples first.

ChanTags Array of channel tags, if available.

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

ErrMsg VI to convert

ErrCode into a readable string.

Notes:

When you collect data with APretrFg.VI or APretrBg.VI and you don't use the

CONVERTDATA option, you must

use this VI to convert the data after it is collected. There are cases where the

CONVERTDATA option is not

allowed—for example, if you use the

BACKGROUND option with APretrBg.VI or APretrFg.VI. In those cases,

use this VI to convert the data after the data collection is complete.

12-bit A/D boards: On some 12-bit boards, each raw data point consists of a 12-bit A/D value with a 4-bit

channel number. This VI separates the two and puts the A/D value into the

DataArray, and the channel number

into the

ChanTags array. Upon returning from APretrBg.VI or APretrFg.VI, DataArray contains only 12-bit

A/D data.

16-bit A/D boards: This VI is used with 16-bit A/D boards only corrects the order of the data. No channel

tags are returned.

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