Laser ranging
oct 2002
history
monitoring
the distomat dropouts and the modification log
azimuth to use when vertically aligning
the distomats
Azimuth angles to use
when aligning the distomats. (top)
The easiest way to align the distomats is to
position
the azimuth arm perpendicular to the corner where the distomat is
pointing.
This should leave that corner at the average platform height. It does
not
matter where the dome/ch is.
Azimuth angles:
-
distomats 1,6 (corner T12) move the azimuth to 92.87, 272.87, or
452.87 degrees (whichever is closer)
-
distomats 2,3 (corner T4) move the azimuth to 32.87, 212.87, or 392.87
degrees (whichever is closer).
-
distomats 4,5 (corner T8) move the azimuth to 152.87, 332.87 or
512.87
degrees (whichever is closer).
Try and center the distomats vertical range on this position.
Some things to keep in mind.
-
Make sure the tiedowns are tracking the average height of the platform
before you start the adjustments. Look at the tiedown Status
display in the control room. The mode should be tieTrk for all 3
tiedowns.
If it does not say this, ask the operators to do a tietrk command
-
The platform should be close to the reference position. Look on the laser
ranging display (the plot of height versus hour of day to the
left of the observers workstation). On the upper right it has the time,
platform position, and the platform reference position. The time should
be within the last 3 or 4 minutes. The last position should be within
.05
feet of the reference position.
-
If the software tries to take a measurement while you are adjusting the
distomat, it may get a no reading. In that case it will switch and use
the temperature to position the tiedowns. This is probably not a
problem.
History
- 20oct08: new reflectors at 2,3,4,5 installed
- 10oct08: new reflectors at 6,1 installed
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