When you import tachymeter measurement files into a calculation project, you use an instrument of type Tachymeter. During the import, instrument settings are used to determine the a priori standard deviation for each observation. For distance observations, the standard deviation is calculated using the distance parameters that are specified in the Instrument settings.
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Tachymeter settings |
Description |
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Standard Horizontal Angle |
Specifies the standard deviation for horizontal angle observations. The display unit is set to the Angle Unit. |
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Standard Vertical Angle |
Specifies the standard deviation for vertical angle observations. The display unit is set to the Angle Unit. |
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Standard Height Difference |
Specifies the standard deviation for height difference observations. The display unit is set to the Distance Unit. |
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Distance Type |
Specifies the default value for the type of distance measurement, such as Slope, or Horizontal. This value can be overwritten by values from the imported files. See also Measurement - Distance Types. |
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Vertical Angle Type |
Specifies the default value for the type of vertical angle measurement. This value can be overwritten by values from the imported file. See also Measurement - Vertical Angle Types |
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Default Centring Error |
Specifies the default value for the centring error. In the Global Settings, use the Category 2 for small units to specify the display unit. See also Unit Settings. |
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Distance Parameter A Distance Parameter B [ppm] Distance Parameter C [ppm2] |
Specifies the parameters that are used to calculate the standard deviation for distance measurement. m0 = A + B/1000 * d + C /1000* SQRT (d) The display unit is set to the Distance Unit. |
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Distance Unit |
Specifies the unit of the distance observation. Notice that this setting also applies to the display of the Distance Parameters, and the Standard Height Difference. See also Working With Units and Unit Format Settings. |
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Angle Unit |
Specifies the unit of the angle observation. Notice that this setting also applies to the display of the Standard Horizontal Angle, and the Standard Vertical Angle. See also Working With Units and Unit Format Settings. |
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Meteo corrected |
Specifies whether the meteorological reduction has already been applied by the instrument. |
Default values for the Tachymeter instrument settings are defined in the Global Settings. See also Global Survey Settings.