DAQmxCreateAIThrmstrChanVex

NI-DAQmx C Functions

DAQmxCreateAIThrmstrChanVex

int32 DAQmxCreateAIThrmstrChanVex (TaskHandle taskHandle, const char physicalChannel[], const char nameToAssignToChannel[], float64 minVal, float64 maxVal, int32 units, int32 resistanceConfig, int32 voltageExcitSource, float64 voltageExcitVal, float64 a, float64 b, float64 c, float64 r1);

Purpose

Creates channel(s) that use a thermistor to measure temperature and adds the channel(s) to the task you specify with taskHandle. Use this function when the thermistor requires voltage excitation.

Parameters

Input
Name Type Description
taskHandle TaskHandle The task to which to add the channels that this function creates.
physicalChannel const char [] The names of the physical channels to use to create virtual channels. You can specify a list or range of physical channels.
nameToAssignToChannel const char [] The name(s) to assign to the created virtual channel(s). If you do not specify a name, NI-DAQmx uses the physical channel name as the virtual channel name. If you specify your own names for nameToAssignToChannel, you must use the names when you refer to these channels in other NI-DAQmx functions.
If you create multiple virtual channels with one call to this function, you can specify a list of names separated by commas. If you provide fewer names than the number of virtual channels you create, NI-DAQmx automatically assigns names to the virtual channels.
minVal float64 The minimum value, in units, that you expect to measure.
maxVal float64 The maximum value, in units, that you expect to measure.
units int32 The units to use to return the measurement.
Name Description
DAQmx_Val_DegC degrees Celsius
DAQmx_Val_DegF degrees Fahrenheit
DAQmx_Val_Kelvins kelvins
DAQmx_Val_DegR degrees Rankine
resistanceConfig int32 The configuration for resistance measurements.
Value Description
DAQmx_Val_2Wire 2-wire mode.
DAQmx_Val_3Wire 3-wire mode.
DAQmx_Val_4Wire 4-wire mode.
voltageExcitSource int32 The source of excitation.
Value Description
DAQmx_Val_Internal Use the built-in excitation source of the device. You must use voltageExcitVal to specify the amount of excitation.
DAQmx_Val_External Use an excitation source other than the built-in excitation source of the device. You must use voltageExcitVal to specify the amount of excitation.
DAQmx_Val_None Supply no excitation to the channel. You cannot use this value if the sensor requires excitation.
voltageExcitVal float64 The amount of excitation, in volts, that the sensor requires.
a float64 The A constant from the Steinhart-Hart thermistor equation.
b float64 The B constant from the Steinhart-Hart thermistor equation.
c float64 The C constant from the Steinhart-Hart thermistor equation.
r1 float64 The value, in ohms, of the reference resistor.

Return Value

Name Type Description
status int32 The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error.