LRS Micro-g LaCoste FG5, Manual, Page: 41 / 149

How to Set Up and Run the FG5
3
is adjusted. When the cross level is adjusted first, it does not change when
the long level is adjusted.
36. It is best to adjust the levels by raising the proper adjustment foot. This will
prevent the dropping chamber from contacting the interferometer.
!
THERE MUST BE NO CONTACT BETWEEN THE TRIPOD/DROPPING
CHAMBER ASSEMBLY AND THE INTERFEROMETER DURING OPERATION.
THIS ALSO APPLIES TO CABLES. CABLES CONNECTED TO THE
INTERFEROMETER
MUST NOT TOUCH THE DROPPING
CHAMBER/TRIPOD, AND CABLES CONNECTED TO THE DROPPING
CHAMBER/TRIPOD
MUST NOT TOUCH THE
INTERFEROMETER/SUPERSPRING.
37. Check the superspring levels and adjust, if necessary, using the leveling feet
on the superspring tripod.
38. Measure the upper reference height using the scale fixture provided. The
upper reference height is the distance between the top of the interferometer
base and the bottom of the dropping chamber. Loosen the clamp on the scale
and pass the scale up through the access hole in the dropping chamber tripod
while pulling the scale slightly towards yourself (the hole is located directly
above fiber optic input on the interferometer base) until it contacts the top of
the interferometer base. The upper reference height is approximately 5 cm.
Record this value in the system check log. The sum of the upper and lower
reference heights (approximately 15 cm) will be entered as the reference
height term in “g” Process | Setup| Information. See the FG5 Software
Manual for instructions.
3.1.7.CABLE CONNECTIONS
39. If the computer is not mounted in the electronics rack, remove it from its
shipping case and place on the top of the electronics case. Make sure the
power switch is off.
40. Connect the computer power cable to the power supply panel.
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