| | 73 | === ACAM stability test on sky === |
| | 74 | |
| | 75 | If we could track a star field on the ACAM along approximately the same track as was done for last night's test (AZ=70.1), while guiding, we should remove questions about the FCU moving and very importantly questions about small deflections of the WFC. Any WFC deflection will be followed by the guider and that will make any residual ACAM motion evident. |
| | 76 | |
| | 77 | So, I wanted to get this on the agenda for the next time we are able to open. The test is: |
| | 78 | |
| | 79 | * Keep the ACAM inserted for the whole track |
| | 80 | * set up on a field that has a 14th mag star and hopefully some others that will allow shifts to be measured |
| | 81 | * guide using either GC1 or GC2 for the full track while taking ACAM images continuously. |
| | 82 | |
| | 83 | Report the images saved, ie. start and stop time for the test. If you have time later in the night you might try using xregister on the frame using the 1st image as the reference. |
| | 84 | |
| | 85 | |
| | 124 | === ACAM stability with rho test === |
| | 125 | |
| | 126 | the ACAM motion is most likely due to the changing gravity vector due to rho motion rather than the smaller changes associated with the overall tracker motion, so we need to separate them. If the motion is entirely correlated with rho then it cannot be the FCU head moving, |
| | 127 | |
| | 128 | Procedure: |
| | 129 | |
| | 130 | * set the tracker at X,Y=(0,0) |
| | 131 | * setup to image the FCU using the ACAM just like the insertion test |
| | 132 | * save an image |
| | 133 | * move the rho by 2 degrees |
| | 134 | * save an image |
| | 135 | * repeat the test over the full range of rho motion (+/- 18 degrees?) |
| | 136 | |
| | 137 | Report the saved images or analyze them with xregister... |
| | 138 | |
