User's Manual

Spectra Precision Focus 4 Total Station User Guide 67

Applications 4

Tip – The minimum data required for a resection is either three angle shots, or one angle

shot and one distance shot. If you use a distance shot, the distance between the target

points must be greater than the measured distance. Stn-Z is calculated from

distance-measured data. If no distances are measured, then Stn-Z is calculated using

angle-only measurements to points with 3D coordinates.

Advanced feature: Viewing and deleting a measurement in resection

To check the measurements to each known point, press

the

View softkey on the calculated STN (sigma or

coordinate) screen.

To delete a measurement (because of large sigma values, for example), highlight the

measurement data or display the detail screen for the measurement. Then press the

DEL softkey. The STN coordinates are automatically recalculated.

To continue resection observations, press the

Add

softkey. The input screen for the next PT appears.

Base XYZ

Select this option to change the instrument XYZ values.

Base XYZ does not store an ST record in the job, so the BS Check cannot check the

backsight if you enter a station using the Base XYZ option.

You can use this function without an open job.

1. Press

[3] or select Base XYZ from the Stn Setup

menu.

The current instrument XYZ values are shown as

the default.

2. Enter the new instrument XYZ values and then

press

[ENT].

3. Do one of the following:

dHA Distributed HA errors in each direction

dVD VD errors between measured distance and

calculated distance

dHD HD errors between measured distance and

calculated distance