NI DAQMX Scale Attributes

Scale Attributes

See how to get and set attributes.

• DAQmx_Scale_Descr
• DAQmx_Scale_ScaledUnits
• DAQmx_Scale_PreScaledUnits
• DAQmx_Scale_Type
• Linear
  • DAQmx_Scale_Lin_Slope
  • DAQmx_Scale_Lin_YIntercept
• Map
  • DAQmx_Scale_Map_ScaledMax
  • DAQmx_Scale_Map_PreScaledMax
  • DAQmx_Scale_Map_ScaledMin
  • DAQmx_Scale_Map_PreScaledMin
• Polynomial
  • DAQmx_Scale_Poly_ForwardCoeff
  • DAQmx_Scale_Poly_ReverseCoeff
• Table
  • DAQmx_Scale_Table_ScaledVals
  • DAQmx_Scale_Table_PreScaledVals

DAQmx_Scale_Descr

Data Type:	char*
Description:	Specifies a description for the scale.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

DAQmx_Scale_ScaledUnits

Data Type:	char*
Description:	Specifies the units to use for scaled values. You can use an arbitrary string.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

DAQmx_Scale_PreScaledUnits

Data Type:	int32
Description:	Specifies the units of the values that you want to scale.

Valid values

DAQmx_Val_Volts	10348	Volts.
DAQmx_Val_Amps	10342	Amperes.
DAQmx_Val_DegF	10144	Degrees Fahrenheit.
DAQmx_Val_DegC	10143	Degrees Celsius.
DAQmx_Val_DegR	10145	Degrees Rankine.
DAQmx_Val_Kelvins	10325	Kelvins.
DAQmx_Val_Strain	10299	Strain.
DAQmx_Val_Ohms	10384	Ohms.
DAQmx_Val_Hz	10373	Hertz.
DAQmx_Val_Seconds	10364	Seconds.
DAQmx_Val_Meters	10219	Meters.
DAQmx_Val_Inches	10379	Inches.
DAQmx_Val_Degrees	10146	Degrees.
DAQmx_Val_Radians	10273	Radians.
DAQmx_Val_Ticks	10304	Ticks.
DAQmx_Val_RPM	16080	Revolutions per minute.
DAQmx_Val_RadiansPerSecond	16081	Radians per second.
DAQmx_Val_DegreesPerSecond	16082	Degrees per second.
DAQmx_Val_g	10186	1 g is approximately equal to 9.81 m/s/s.
DAQmx_Val_MetersPerSecondSquared	12470	Meters per second per second.
DAQmx_Val_InchesPerSecondSquared	12471	Inches per second per second.
DAQmx_Val_MetersPerSecond	15959	Meters per second.
DAQmx_Val_InchesPerSecond	15960	Inches per second.
DAQmx_Val_Pascals	10081	Pascals.
DAQmx_Val_Newtons	15875	Newtons.
DAQmx_Val_Pounds	15876	Pounds.
DAQmx_Val_KilogramForce	15877	Kilograms-force.
DAQmx_Val_PoundsPerSquareInch	15879	Pounds per square inch.
DAQmx_Val_Bar	15880	Bar.
DAQmx_Val_NewtonMeters	15881	Newton meters.
DAQmx_Val_InchOunces	15882	Ounce-inches.
DAQmx_Val_InchPounds	15883	Pound-inches.
DAQmx_Val_FootPounds	15884	Pound-feet.
DAQmx_Val_VoltsPerVolt	15896	Volts per volt.
DAQmx_Val_mVoltsPerVolt	15897	Millivolts per volt.
DAQmx_Val_Coulombs	16102	Coulombs.
DAQmx_Val_PicoCoulombs	16103	PicoCoulombs.
DAQmx_Val_FromTEDS	12516	Units defined by TEDS information associated with the channel.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

DAQmx_Scale_Type

Data Type:	int32
Description:	Indicates the method or equation form that the custom scale uses.
Restrictions:	Not Settable

Valid values

DAQmx_Val_Linear	10447	Scale values by using the equation y=mx+b, where x is a prescaled value and y is a scaled value.
DAQmx_Val_MapRanges	10448	Scale values proportionally from a range of pre-scaled values to a range of scaled values.
DAQmx_Val_Polynomial	10449	Scale values by using an Nth order polynomial equation.
DAQmx_Val_Table	10450	Map an array of pre-scaled values to an array of corresponding scaled values, with all other values scaled proportionally.

You can get this attribute using:   DAQmxGetScaleAttribute

Linear

DAQmx_Scale_Lin_Slope

Data Type:	float64
Description:	Specifies the slope, m, in the equation y=mx+b.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

DAQmx_Scale_Lin_YIntercept

Data Type:	float64
Description:	Specifies the y-intercept, b, in the equation y=mx+b.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

Map

DAQmx_Scale_Map_ScaledMax

Data Type:	float64
Description:	Specifies the largest value in the range of scaled values. NI-DAQmx maps this value to DAQmx_Scale_Map_PreScaledMax. Reads coerce samples that are larger than this value to match this value. Writes generate errors for samples that are larger than this value.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

DAQmx_Scale_Map_PreScaledMax

Data Type:	float64
Description:	Specifies the largest value in the range of pre-scaled values. NI-DAQmx maps this value to DAQmx_Scale_Map_ScaledMax.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

DAQmx_Scale_Map_ScaledMin

Data Type:	float64
Description:	Specifies the smallest value in the range of scaled values. NI-DAQmx maps this value to DAQmx_Scale_Map_PreScaledMin. Reads coerce samples that are smaller than this value to match this value. Writes generate errors for samples that are smaller than this value.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

DAQmx_Scale_Map_PreScaledMin

Data Type:	float64
Description:	Specifies the smallest value in the range of pre-scaled values. NI-DAQmx maps this value to DAQmx_Scale_Map_ScaledMin.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

Polynomial

DAQmx_Scale_Poly_ForwardCoeff

Data Type:	float64*
Description:	Specifies an array of coefficients for the polynomial that converts pre-scaled values to scaled values. Each element of the array corresponds to a term of the equation. For example, if index three of the array is 9, the fourth term of the equation is 9x^3.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

DAQmx_Scale_Poly_ReverseCoeff

Data Type:	float64*
Description:	Specifies an array of coefficients for the polynomial that converts scaled values to pre-scaled values. Each element of the array corresponds to a term of the equation. For example, if index three of the array is 9, the fourth term of the equation is 9y^3.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

Table

DAQmx_Scale_Table_ScaledVals

Data Type:	float64*
Description:	Specifies an array of scaled values. These values map directly to the values in DAQmx_Scale_Table_PreScaledVals.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute

DAQmx_Scale_Table_PreScaledVals

Data Type:	float64*
Description:	Specifies an array of pre-scaled values. These values map directly to the values in DAQmx_Scale_Table_ScaledVals.

You can get/set this attribute using:   DAQmxGetScaleAttribute   DAQmxSetScaleAttribute