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. |