Creates scaling information for unscaled data in a .tdms file. This VI writes the scaling information to the .tdms file. You must manually select the polymorphic instance to use.

To call this VI with TDMS Advanced functions, only call the TDMS Set Channel Information function after any calls to this VI.

Use the TDMS File Viewer VI to retrieve the scaling information from a .tdms file.

Note This VI does not scale strings or complex floating-point numbers.


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Inputs/Outputs

  • cnclst.png strain scale —

    strain scale specifies the strain scaling information, which scales the .tdms data in strains. Strain is the amount of deformation of a body due to an applied force. Specifically, strain is the fractional change in length.

  • ci32.png configuration —

    configuration specifies the bridge configuration for the strain gages.

    10183Full Bridge I (default)
    10184Full Bridge II
    10185Full Bridge III
    10188Half Bridge I
    10189Half Bridge II
    10271Quarter Bridge I
    10272Quarter Bridge II
  • cdbl.png Poisson ratio —

    Poisson ratio specifies the ratio of lateral strain to axial strain in the material you are measuring.

  • cdbl.png gage resistance —

    gage resistance specifies the resistance, in ohms, of the gages in an unstrained position. Each gage in the bridge must have the same nominal gage resistance. The resistance across arms of the bridge that do not have strain gages also must be the same as the nominal gage resistance. Refer to the sensor documentation to determine this value.

  • cdbl.png lead wire resistance —

    lead wire resistance specifies the amount of resistance in ohms in the lead wires. Ideally, this value is the same for all leads.

  • cdbl.png initial bridge voltage —

    initial bridge voltage specifies in volts the output voltage of the bridge in the unloaded condition. This VI subtracts this value from any measurements before applying scaling equations. Perform a voltage measurement on the bridge with no strain applied to determine this value.

  • cdbl.png gage factor —

    gage factor specifies the sensitivity of the strain gages and relates the change in electrical resistance to the change in strain. Each gage in the bridge must have the same gage factor. Refer to the sensor documentation to determine this value.

  • cdbl.png voltage excitation —

    voltage excitation specifies in volts the amount of excitation that the sensor requires. Refer to the sensor documentation to determine this value.

  • ci32.png input source —

    input source specifies the ID of the child scale. If the current scale has a child scale, you can wire the scale ID of the child scale to this input. The default is –1, which specifies that the current scale does not have a child scale.

  • cgnrn.png tdms file —

    tdms file specifies a reference number to the .tdms file on which to perform the operation. Use the TDMS Open function to open the refnum. group name and channel name take precedence over this input. If you specify a value for either group name or channel name, this VI applies the scaling information to either the group or the channel, respectively. If you do not specify a value for them, this VI applies the scaling information to the .tdms data.

  • cstr.png group name —

    group name specifies the group name for the .tdms data. This input takes precedence over tdms file but has a lower priority than channel name.

  • cstr.png channel name —

    channel name specifies the channel name for the .tdms data. This input takes precedence over group name and tdms file. If you do not specify a value for channel name, this VI applies the scaling information to the group. If you do not specify a value for group name either, this VI applies the scaling information to the .tdms data.

  • cerrcodeclst.png error in (no error) —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • ignrn.png tdms file out —

    tdms file out returns a TDMS file reference to the .tdms file on which you performed the operation.

  • istr.png group name out —

    group name out returns the name of the channel group on which you performed the operation.

  • istr.png channel name out —

    channel name out returns the name of the channel on which you performed the operation.

  • ierrcodeclst.png error out —

    error out contains error information. This output provides standard error out functionality.

  • ii32.png scale ID —

    scale ID returns the ID of the resulting scale.

    • Examples

    Refer to the following example files included with LabVIEW.

    • labview\examples\File IO\TDMS\Scale TDMS Data.vi