User's Manual

InterSense Doc. No. 072-00105-0I07 Rev. 4.2
IS-900 User Guide Page 106 of 177
GENLOCK feature in on, but a valid signal is not being detected. See Appendix F for details
about GENLOCK.
Row 1 (Stn) lists station numbers.
Row 2 (Status) displays the tracking status. Stations display T when tracking position, and
L (Lost) when position tracking is not possible. If a station configuration is invalid or
hardware is not connected, X is displayed.
Row 3 (Meas) displays the number of range measurements received by each station during
the last cycle. A range measurement is defined as an ultrasonic signal received by a single
microphone. Typical values are in the 10-14 range; low values can have several causes,
including weak microphones, low emitter volume, being too far away from the emitter, or
having the microphones turned away from the majority of emitters.
Row 4 (Rej) displays the number or range measurements rejected by the system. This
number should normally be 0-1. Measurements can be rejected for one of the following
reasons:
o SoniStrip configuration (Constellation) is inaccurate
o Certain positions or orientations may cause errors in measurements to specific emitters;
moving the tracker slightly may prevent the rejections
o Extremely fast movements can sometimes cause some measurements to be rejected
o It is worth noting that rejections are not used by the IS-900 in calculating position
updates, so are not necessarily an indication of any problem as long as the overall
measurement counts are good
Row 5 (TQ) displays the tracking quality of the station as a percentage. It is a measure of
the number of measurements a station receives and the size of the range errors of the
measurements. 100% means that the station is tracking perfectly and 0% means it is lost.
Row 6 (CI) displays the communication integrity of the station as a percentage. 100%
means that the station is communicating perfectly and 0% means that it is not
communicating at all. An “X” will be displayed on the Status line when this value drops
below 30%.
Row 7 (MQ) displays the measurement quality of the station as a percentage. 100% means
that the station has range errors of 1mm or less on average, and for a properly sighted
constellation this should be >95% for a stationary tracker, in most cases.