Measurement-computing TempBook rev.3.0 Instrukcja Użytkownika Pobierz pdf (Strona 103)

TempBook User’s Manual

Enhanced

API Programming Models (TempBook) 10-7

Temperature Acquisition Using One-Step Commands

This example demonstrates the Enhanced API’s high-level one-step routines to

read thermocouple input from the TempBook/66 device. These functions

combine scan sequencer setup, ADC data collection, and thermocouple

linearization. Functions used include:

•

VBdaqSetDefaultHandler&(handler&)

•

VBdaqGetDeviceCount&(deviceCount&)

•

VBdaqGetDeviceList&(deviceList&, deviceProps)

•

VBdaqOpen&(daqName$)

•

VBdaqAdcSetDataFormat&(handle&, rawFormat&,

postProcFormat&)

•

VBdaqAdcRd&(handle&,chan&, sample%, gain&, flags&)

•

VBdaqAdcRdScan&( handle&,startChan&, endChan&, buf%,

gain&, flags&)

•

VBdaqAdcRdScanN&( handle&,chan&, buf%, scanCount&,

triggerSource&, rising&, level%, freq!, gain&, flags&)

•

VBdaqAdcRdN&(handle&,chan&, startChan&, endChan&, buf%,

scanCount&, triggerSource&, rising&, level%, freq!,

gain&, flags&)

•

VBdaqClose&(handle&,daqEvent&)

Const Scans& = 5000

Const Level% = 0

Const Rising& = 0

Const Start& = 0

Const End& = 0

Const Freq! = 6000.0

Const Gain& = TbkBiTypeJ&

Const Flags& = DafBipolar& + DafDifferential& + DafTcTypeJ&

Const Chans& = End& - Start&+1

Dim buf%(80), handle&, ret&, flags&

Dim I&, j&, deviceCount&, handle&, deviceIndex&

Dim temp%, temps%(Scans&*Chans&)

Dim sum!, totals!(Chans&)

Dim ret&

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

device name must be a valid device name for a configured device.

handle& = VBdaqOpen&(“TempBook0”)

Set the raw data format to native and the post-processing data format to temperature in tenths of a degree C.

The post-processing data format controls the format of the data returned by the one-step acquisition

functions such as

daqAdcRd

. In this case,

daqAdcRd

returns temperatures rather than raw ADC

readings.

ret& = VBdaqAdcSetDataFormat& (handle&, DardfNative&, DappdfTenthsDegC&)

The following statement retrieves a single ADC sample from a type J thermocouple on channel

Start&

and converts the reading to a temperature. The temperature is returned in the

sample%

parameter and is a

16-bit quantity which represents tenths of degrees C.

ret& = VBdaqAdcRd& (handle&, Start&, temp%, TbkBiTypeJ, Flags&)

Now the results for the single-sample read are displayed:

Print "Results of daqAdcRd for channel “, Start&, “: (single reading)"

Print "Temperature: “, temp/10.0, “C"

The next statement retrieves

Scans&(5000)

number of samples from a type J thermocouple on channel

Start&

and converts the readings to a single temperature using block averaging. The trigger source is set

DatsImmediate&

so the scans will be acquired immediately. Again, the temperatures are returned as

16-bit words representing tenths of degrees C.

1 2 ... 98 99 100 101 102 103 104 105 106 107 108 ... 165 166

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