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Spectra Precision FAST Survey Reference Manual User Manual

Page 133

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Apply Collimation:

Leads to a report on the collimation of the total staiton instrument provided that both direct

and reverse measurements are taken to the same foresights.

Apply Refraction Correction:

This option should be selected only if the instrument itself does not automatically

apply refraction correction in the reported readings.

Sets Order:

The two choices are to take ALL backsight direct readings first followed by all backsight reverse

readings (BD-BD/BR-BR) or to be prompted for the reverse reading following each backsight direct measurement

(BD-BR/BD-BR).

Horizontal Circle Accuracy:

Estimation of accuracy is used in least squares calculation.

Vertical Circle Accuracy:

Estimation of accuracy is used in least squares calculation.

Distance Accuracy:

Estimation of accuracy is used in least squares calculation.

Prism Offsets can be changed for each total station measurement taken that includes a distance reading. In the above

screens, the instrument was set to "Manual Total Station". When set to an actual field instrument, the "Target Settings"

button appears.

A reflectorless reading, above left, contrasts with a Leica 360 prism reading, above right. If measuring angle-only

readings to objects such as radio towers and church steeples, you can stay in prism mode but just click off the SD (slope

distance) component. Click Target Settings and you can set the prism offset from a list of options. Target type is

"Prism" or "Reflectorless".