Figure 3-2 Characterized Measurement Volume - Northern Digital Polaris Vicra User Manual

The characterized measurement volume is a subset of the field of view. It is the volume where
data was collected and used to characterize the Polaris Vicra System Position Sensor. The
dimensions of the characterized measurement volume are illustrated in
Within the characterized measurement volume, the Polaris Vicra System can measure a single
marker with an accuracy of 0.25 mm RMS. The accuracy of measurements reported outside the
Polaris Vicra characterized measurement volume is unknown. The Polaris Vicra System is
specifically designed to NOT report these measurements; however, you can request such
information by applying additional API commands to application software. You enable this
additional functionality at your own discretion. The Position Sensor's performance is determined
using the calibration methodology described in
Out of Volume and Partially Out of Volume
A tool is flagged as out of volume if all of its markers are outside of the characterized measurement
volume, but the system can still detect the tool.
By default, the Polaris Vicra System reports tools with markers that are outside of the characterized
measurement volume as MISSING. You can tell the Polaris Vicra System to report the
Polaris Vicra User Guide - Revision 2
Front View
491 mm
938 mm

Figure 3-2 Characterized Measurement Volume

How the Polaris Vicra System Works
Figure
Appendix A on page 85.
Side View
887 mm
392 mm
Top View
1336 mm
557 mm
3-2.
27