Measurement-computing Data Acquisition Systems rev.10.4 Manuel d'utilisateur télécharger pdf (Page 170)

daqCvtSetAdcRange

Also See:daqCvtLinearSetup, daqCvtLinearConvert

daqCvtLinearSetupConvert

Format

daqCvtSetAdcRange (Admin, Admax)

Purpose

daqCvtSetAdcRange sets the ADC range for use by the conversion functions (i.e., all functions of the form

daqCvt… ).

Parameter Summary

Parameter Type Description

Admin FLOAT

A/D minimum voltage range (in volts)

Admax FLOAT

A/D maximum voltage range (in volts)

Parameter Values:

Admin: valid values depend on the device and signal being processed

Admax: valid values depend on the device and signal being processed

Returns

DerrNoError No error

Function Usage

For all functions of the form daqCvt..., raw data to be converted must be unsigned

(i.e., the dafUnsigned value must be set using the daqAdcSetScan function).

For T/C and RTD conversion, users of Daq/2000 Series devices* and/or Daq PC Cards must

be sure that the main unit is using ten volt range gains settings, either unipolar (0 V to 10 V)

or bipolar (-5 V to +5 V).

See the “T/C Gains Settings” section in the daqCvtTCConvert function entry for the

appropriate settings.

* Daq/2000 Series devices include DaqBook/2000 Series, DaqScan/2000 Series, DaqLab/2000

Series, and DaqBoard/2000 Series devices.

The daqCvtSetAdcRange function is used by the conversion functions to establish the range of an

acquisition. The voltage range is dependent on the acquisition’s gain values as set in the daqAdcSetScan

function—see daqAdcSetScan for more information.

Prototypes

C/C++

daqCvtSetAdcRange(FLOAT Admin, FLOAT Admax);

Visual BASIC

VBdaqCvtSetAdcRange&(ByVal ADmin!, ByVal ADmax!)

Program References

None

4.3-44 Daq API Command Reference 908494 Programmer’s Manual

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Measurement-computing Data Acquisition Systems rev.10.4 Manuel d'utilisateur Page 170