NGSLR Operations Manual
Most Common Errors and Their Resolutions
Document Number:
P a g e |
6 0
NASA NGSLR OPS Manual (v1.0)
8.6 System is not getting returns
8.6.1 No returns during ground calibrations
1.
Verify that the laser is firing
(If not, see Section 8.5)
2.
Verify that that noise shows up on the O C plot on RAT, the PMT is ON and that the beam block
has been manually removed
3.
Verify that the dome is open
a. During the day Can you see the target in the telescope camera monitor?
b. During the night Can you see the laser reflection off of the target in the telescope camera
monitor?
4.
Verify that the target is not dirty, obscured, covered in moisture (dew/frost), rotated out of
alignment, etc
5.
Verify that the Risley prisms are zeroed during the ground calibration
6.
Try to add pointing bias to the telescope using the
Handpaddle or Ranging C
ontrol in Ratgui
7.
Review the startup checklist
Ensure that all equipment has been appropriately powered on and is
running according to procedure.
8.
If you have verified all of these steps, and the problem is still not solved, check with the NGSLR
Manager, NASA SLR Manager, or the Engineering Lead for the appropriate course of action
Inform
them of each step attempted in the troubleshooting process along with the result.
8.6.2 Low return rate during a ground calibration
1.
Remove ND s using the Rotary ND wheels
(Figure 8 14)
Figure 8 14: The Misc Control window showing All Returns selected
Adjusting the Rotary ND filters
: The default number of ND s applied by the rotary ND s is 2.0. Look at the counts shown in
Figure 6 11. If it isn t in between 40 and 200, remove or add ND s using the
Number of ND s Used
entry in the
Misc Control
window to get the number of returns within an appropriate range.
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