chara:trouble_shooting
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chara:trouble_shooting [2021/11/04 18:06] charaobs [The Telescope won't move or stopped moving] |
chara:trouble_shooting [2021/11/04 23:53] charaobs [Can't find fringes] |
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| * Were the clocks synced? Make sure the [SYNC CLOCKS] button on Cosmic Debris has been pushed to start the night. If the OPLE server does not display the correct CHARA time and the errors don't read (0) or (1), the clocks were not synced. | * Were the clocks synced? Make sure the [SYNC CLOCKS] button on Cosmic Debris has been pushed to start the night. If the OPLE server does not display the correct CHARA time and the errors don't read (0) or (1), the clocks were not synced. | ||
| - | * Did the Astrolib update on OPLE? If the job queue is stopped too soon after slewing on Cosmic Debris, the correct calculations for the carts will not be done by OPLE and you may be searching for fringes with the wrong star data. Hit STAR ACQUIRED on CD to update ople. The proper star can also be entered by typing hd #### into the OPLE server and hitting ENTER. | + | * Did the Astrolib update on OPLE? If the job queue is stopped too soon after slewing on Cosmic Debris, the correct calculations for the carts will not be done by OPLE and you may be searching for fringes with the wrong star data. Hit STAR ACQUIRED on CD to update ople. The proper star can also be entered |
| * Are the PoP's correct? After a PoP change, the PoP's are sometimes not updated in CD or ople. | * Are the PoP's correct? After a PoP change, the PoP's are sometimes not updated in CD or ople. | ||
| - | * Are the carts behaving or are there vibrations or jumps of 100 or more microns every 3-6 seconds? | + | * Are the carts behaving or are there vibrations or jumps of 100 or more microns every 3-6 seconds? |
| * Is the target a high proper motion star? Red dwarfs are close stars and can have high proper motions. Scan a wider range to see if it is outside of the usual calculated scan range. Binaries can also have very high offsets from the expected position due to mistakenly using astromod calculations from the companion star. | * Is the target a high proper motion star? Red dwarfs are close stars and can have high proper motions. Scan a wider range to see if it is outside of the usual calculated scan range. Binaries can also have very high offsets from the expected position due to mistakenly using astromod calculations from the companion star. | ||
| - | * Do you have enough flux from each telescope or on each baseline? | + | * Do you have enough flux from each telescope or on each baseline? Is the telescope tiptilt struggling with low flux? Can the camera gain be raised or the exposure made longer to help hold the star? |
| * Did you get the same star in each telescope? Sometimes a busy star field and poor pointing of the telescopes can lead to the wrong star being acquired and locked by tiptilt. View the stars in the finder window to see if all the stars match. | * Did you get the same star in each telescope? Sometimes a busy star field and poor pointing of the telescopes can lead to the wrong star being acquired and locked by tiptilt. View the stars in the finder window to see if all the stars match. | ||
| * Check the CHARA time on the GPS server. The " | * Check the CHARA time on the GPS server. The " | ||
| * Check the time on the OPLE server. If the time is off or there are any lost ticks/ | * Check the time on the OPLE server. If the time is off or there are any lost ticks/ | ||
| * Are the [MAN] buttons pressed (gray) for the moving carts on the OPLE Control gui? (The reference cart will remain green.) | * Are the [MAN] buttons pressed (gray) for the moving carts on the OPLE Control gui? (The reference cart will remain green.) | ||
| - | * Check that the carts are within delay line range (-1 to 44 meters) and errors are small. Were the carts homed before the first slew of the night? Did any carts go to the front switch after slewing? This can cause them to lose their position. Turn off the OL button to send it back to zero. If it does not track on the home switch when displaying a zero position (0.000000), it was lost. Is the E2 cart stuck at 27.97m? | + | * Check that the carts are within delay line range (-1 to 44 meters) and errors are small. Were the carts homed and checked |
| * Are the LDC's working? | * Are the LDC's working? | ||
| * Is the glass position within allowable range (-10mm to 49mm) on all beams? | * Is the glass position within allowable range (-10mm to 49mm) on all beams? | ||
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| * If LDCs are working correctly, the LDC positions (in mm) should roughly match up with the reference cart positions (in meters). | * If LDCs are working correctly, the LDC positions (in mm) should roughly match up with the reference cart positions (in meters). | ||
| - | * Check the instrument alignment. Is flux getting through to the detector? How long has it been since the last NIRO camera alignment? Classic and CLIMB programs can run for about an hour before the light will drift from the central pixel. Use the Classic or CLIMB gui to view the light on the pixels by clicking the PICTURE tab and then the PIXEL AREA button. Turn the camera off after a few seconds to avoid crashing NIRO. Is the right dither power turned on? CLIMB 1 and Classic use different dithers. If Classic or CLIMB fringes are found in a scan, but not when in recording mode, the dither powers are likely not on. Are the camera settings correct for the seeing conditions and flux levels? | + | * Check the instrument alignment. Is flux getting through to the detector? How long has it been since the last NIRO camera alignment? Classic and CLIMB programs can run for about an hour before the light will drift from the central pixel. Use the Classic or CLIMB gui to view the light on the pixels by clicking the PICTURE tab and then the PIXEL AREA button. Turn the camera off with the STOP button. Is the right dither power turned on? CLIMB 1 and Classic use different dithers. If Classic or CLIMB fringes are found in a scan, but not when in recording mode, the dither powers are likely not on. Are the camera settings correct for the seeing conditions and flux levels? |
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| 5. After the telescope is back in it normal range, click OVERRIDE OFF which makes the hardware aware of the limits again</ | 5. After the telescope is back in it normal range, click OVERRIDE OFF which makes the hardware aware of the limits again</ | ||
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| * Good metrology signals are important to the proper positioning of the carts. Monitor the signal strength by running [RUN MULTIPLE] on the Metrology Monitor. Place the windows above the TV windows for each scope you are using. They should show white sine waves that are around the height of the window. Erratic, fluctuating waves indicate self-interference or a weak signal. This may cause the carts to lose their place as the signal strength falls too low. Red waves indicate that some displayed signal has gone too low and the carts will all need to be homed. A careful adjustment of the MET2 mirror can sometimes bring the signal back. Do not adjust the MET1 mirror. | * Good metrology signals are important to the proper positioning of the carts. Monitor the signal strength by running [RUN MULTIPLE] on the Metrology Monitor. Place the windows above the TV windows for each scope you are using. They should show white sine waves that are around the height of the window. Erratic, fluctuating waves indicate self-interference or a weak signal. This may cause the carts to lose their place as the signal strength falls too low. Red waves indicate that some displayed signal has gone too low and the carts will all need to be homed. A careful adjustment of the MET2 mirror can sometimes bring the signal back. Do not adjust the MET1 mirror. | ||
| - | * To home the carts, turn off the [OL] and [MAN] buttons on each cart and it will automatically return to the front switch. If the cart has no issue, it will arrive at the target position of 0m and the home switch at the same time. The X in the OPLE server under the HM will indicate it has homed to the home switch. If a cart does not reach the home switch when it returns to position 0m, it was lost and likely the cause of the difficulty in finding fringes. Hit the [HOME] button and it should move forward and trigger the home switch. Hit [TRACK] to home it to the new home position. | + | * To home the carts, turn off the [OL] and [MAN] buttons on each cart and it will automatically return to the front switch. If the cart has no issue, it will arrive at the target position of 0m and the home switch at the same time. The X in the OPLE server under the HM will indicate it has homed to the home switch. If a cart does not reach the home switch when it returns to position 0m, it was lost and likely the cause of the difficulty in finding fringes. You can also find the size of the error by typing the command " |
| ===== Beam Samplers ===== | ===== Beam Samplers ===== | ||
chara/trouble_shooting.txt · Last modified: 2024/06/18 00:21 by charaobs
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