Campbell-scientific CR9000X Measurement and Control System Manual do Utilizador descarregar pdf (Página 286)

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101

Section 7. Measurement Instructions

7-62

FFTSample (Source, DataType)

FFTSample is an output instruction used to sample a variable array written by

an FFTFilt instruction. FFTSample is used in place of the Sample instruction

because it gets the FFT programming from the FFTFilt instruction and stores

this processing information in the header of the data table. Without the

processing information, RTDaq would not be able to automatically detect and

plot the FFT.

Parameter

& Data Type

Enter

FFTSAMPLE PARAMETERS

Source

Variable

The variable that in the FFTFilt Destination array that contains the start of the spectrum

returned by the FFTFilt instruction. This must be the same variable array that was used as the

FFTFilt Destination. All of the spectral values returned by the FFTFilt Instruction for that

CR9052 channel will be output. Separate FFTSample instructions are required to output each

of the Reps used in an FFTFilt instruction. The datalogger will return a compile error if it

cannot find an FFTFilt instruction which uses this source variable as the destination for a

spectrum.

DataType

A code to select the data storage format.

Constant

Alpha Code Numeric Code Data Format

IEEE4 24 IEEE 4 byte floating point

FP2 7 Campbell Scientific 2 byte floating point

1 2 ... 281 282 283 284 285 286 287 288 289 290 291 ... 441 442

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Campbell-scientific CR9000X Measurement and Control System Manual do Utilizador Página 286

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