Measurement-computing TempBook rev.3.0 Manual de usuario descargar pdf (Pagina 114)

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API Programming Models (TempBook) TempBook User’s Manual

Temperature Acquisition Using TC Conversion Functions

This example demonstrates the general-purpose data-transfer functions

coupled with TC-specific conversion routines. This method first configures

the channel scan group for thermocouple input, then acquires the raw A/D

data from the thermocouple input, and finally, converts the raw A/D data to

temperature units in degrees C.

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VBdaqOpen&(daqName$)

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VBdaqAdcSetFreq& (handle&, freq!)

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VBdaqAdcSetAcq& (handle&, mode&, preTrigCount&,

postTrigCount&)

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VBdaqAdcSetScan& (handle&, channels&(),

gains&(), flags&(), chanCount&)

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VBdaqAdcSetClockSource&(handle&, clockSource&)

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VBdaqAdcSetTrig& (handle&, triggerSource&, rising&,

level%, hysteresis%, channel&)

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VBdaqAdcTransferSetBuffer&(handle&, buf%(),

scanCount&, transferMask&)

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VBdaqAdcTransferStart& (handle&)

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VBdaqAdcArm&(handle&)

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VBdaqWaitForEvent(handle&, event&)

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VBdaqAdcTransferGetStat& (handle&, active&,

retCount&)

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VBdaqCvtTCSetupConvert(nscan&, cjcPosition&, ntc&,

tcType&, bipolar&, avg&, counts%(), scans&,

temp%(), ntemp&)

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VBdaqClose&(handle&)

The following list defines the necessary constants and variables for

temperature acquisition and conversion.

Const Scans& = 10

Const Level% = 0

Const Rising& = 0

Const Start& = 0

Const End& = 7

Const NumTcChans& = End& - Start& + 1

Const TotalChans& = NumTcChans + 3

Const TcGain& = TbkBiTypeJ&

Const CjcGain& = TbkBiCJC&

Const TcType& = TbkTCTypeJ&

Const Freq! = 1000.0

Const AvgType& = 0

Const Gain& = TbkBiTypeJ&

Const Flag& = DafUnsigned& + DafDifferential& + DafBiPolar&

Const Chans& = End& - Start&+1

Dim buf%(Scans& * TotalScans&)

Dim temp%(NumTcChans&)

Dim handle&

Dim I&,j&, active&, retCount&

Dim Gains&(TotalChans&)

Dim Chans&(TotalChans&)

Dim Flags&(TotalChans&)

First, we need to open the TempBook/66 device. This example uses a device named “TempBook0”. The

device name must be for a valid configured device.

‘ Open TempBook/66 device

handle& = VBdaqOpen&(“TempBook0”)

Next, build the channel scan group configuration. The following code sets up the configuration arrays that

define the channel scan group. The channels are configured with the appropriate gain, mode and polarity

definitions.

‘ Configure CJC and shorted channel

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Measurement-computing TempBook rev.3.0 Manual de usuario Pagina 114

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