Spectra Precision FOCUS 2 Series - Face-1;Face-2 Measurements

SPECTRA PRECISION FOCUS 2 SERIES TOTAL STATION USER GUIDE
2 – Preparation
35
Face-1/Face-2 measurements
A measurement can be taken from either face of the instrument. To change the face, rotate the
instrument 180° on its base, and rotate the telescope 180° within the standard.
By averaging the Face-1 and Face-2 measurement values, most constant mechanical errors can be
cancelled out. Some errors, such as vertical axis error, cannot be cancelled out by averaging Face-1
and Face-2 measurements.
When rotating the telescope, take care not to catch a finger in the gap between the instrument’s
standard and the telescope.
A Face-1 measurement is made with the vertical circle positioned to the left of the telescope
eyepiece. A Face-2 measurement is made with the vertical circle positioned to the right of the
telescope eyepiece.
Face 1 Face 2