Trillium Compact User Guide
16889R5
2014-03-04
74
Appendix C
Levelling Cradle and Spike Kit
C.1 Using the Levelling Cradle
The optional Trillium Compact levelling cradle (Nanometrics part number 16863) allows you
to accurately level your seismometer in seconds on installation surfaces that are as much
as ±9º outside of level. The two-sided cradle provides bowls of two depths. The shallow bowl
corrects an uneven surface by up to ±5º and the deep bowl corrects by up to ±9º.
The Trillium Compact rests on three slanted supports that create a bowl shape. Using the
levelling bubble on the top of the case, simply adjust the seismometer on the supports until
the bubble is in the centre of the black ring. When using the cradle on its own (without the
spike kit described in
on page 75) use the shallow bowl of the cradle to hold
the Trillium Compact. The supports on the deep side of the cradle are designed to act as
feet when the spike kit is not in use.
Figure C-1
Levelling cradle features and dimensions
Although images in this chapter show the surface vault Trillium Compact, the contents of this
chapter are applicable to all models of the Trillium Compact featured in this user guide.
(1) All dimensions in
are in millimetres unless otherwise stated.
(2) Remove the three feet from the seismometer before placing it in the levelling cradle.
Retain the feet for future installations.
