Index
- Optical Bench Temperatures
- CCD Temperatures
- Clock Temperatures
- Forward Telescope Temperatures
- CEB Temperatures
- Door Temperatures
- HEB Instrument Temperatures
- HEB Spacecraft Temperatures
- Oven Temperatures
- Duty Cycle In Use
- Spacecraft Bus Voltage
- HMI Bus Current
- Motor Currents
- Secondary Voltages (3V and 5V Monitors)
- Secondary Voltages (15V and -15V Monitors)
- Secondary Voltages (78V Monitor)
- ISS Diode Voltages
- PS Commanded Delay
- PS Table Size
- WT Commanded Delay
- WT Table Size
- Shutter Exposure Time
- Exposure Quality
- Leg Positions
- Dark Current
- NPACKETS
- DATAMIN
- PZT A Avg
- PZT B Avg
- PZT C Avg
- Best Focus Position
- Corrupt Images
- Cal Mode Trend
- Dopplergram Coverage
- Pointing Information
- Velocity Drift
- Clock Increment
- Timer Violations
Trending Review Meeting Notes
Optical Bench Temperatures
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- We make periodic adjustments to the bench temperatures to keep them within an acceptable range. These adjustments are visible as small step functions in the plot.
- Rock will make a proposal for tuning the bench temperatures. (05/29/2012)
CCD Temperatures
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- The profile of the CCD temperatures changes around eclipse season, with a slight increase in the minimum daily temperature apparent from roughly 1 month before the start of eclipse season to one month after the end of eclipse season.
Clock Temperatures
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- N/A
Forward Temperatures
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- The forward temperature is climbing slowly. The window is slowly degrading, changing the temperature distribution (which affects the focus), so we have been periodically increasing the temperature, to drive the focus down. The front window degradation should have stabilized, ut we will keep asjusting the temperatures about twice a year.
- How many degress/year is an acceptable rate? (05/29/2012)
- When do we run out of control authority - what value? (08/13/2012)
- Comfortable margin for 10 years: ~ 1deg/year, heater adjusts are ~ 1%/year (08/13/2012)
- 201308 - Trending upwards, but not close to upper limits (48/50 C yellow/red limits for mounting ring).
CEB Temperatures
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- The CEB temperatures follow an annual cycle. They also dip down during spacecraft maneuvers and eclipses, when the CEB is recieving less Solar radiation.
Door Temperatures
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- The door temperatures follow an annual cycle, and is rising slowly as the surface treatment degrades. There are several jumps in the temperature at the beginning of the mission, which correspond with similar jumps in the front window temperatures.
- 201308 - Similar to front window but at a lower temperature. Bears watching because it's an indication of the front window environment but the rising trend is not a concern at this time.
HEB Instrument Temperatures
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- N/A
HEB Spacecraft Temperatures
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- N/A
Oven Temperatures
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- There are small dips correlated to the eclipse periods caused by the fact less heat is absorbed from the sun. (05/29/2012)
- The daily trend is due to "box" temps. (05/29/2012)
- 201308 - Drop in Lyot temperature noted at the time of the processor reset. May be due to use of primary versus redundant heater or some other factor. This needs investigation. Processor reset (April 2013) is seen in several plots but this is a notable difference in behavior.
Duty Cycle In Use
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Spacecraft Bus Voltage
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- N/A
HMI Bus Current
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- Please note the data for the mission long plot through the first quarter of 2011 are erroneous. Please ignore the low values in this part of the mission long plot.
- Possibly smooth to show the eclipse or other trends. (05/29/2012)
- 201308 - Processor reset evident, including recovery time for getting the current back on track.
Motor Currents
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- Possible downward trend in motor currents? Due to motors wearing in? (12/04/2012)
- 201308 - There was a notable difference in behavior at the time of the processor reset. Maximum motor current is lower after reset and there are consistently fewer zero minimum values. Rock thinks this may be due to the spin tests run during the recovery redistributing the motor lubricant. It was noted that spin tests should be run yearly.
Secondary Voltages (3V and 5V monitors)
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- The widening of the voltage profile on March 19, 2010 corresponds with when we first started running the sequencer (and using the motors).
Secondary Voltages (15V and -15V monitors)
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- What is the cause of the increase at the end? Check with Cliff Evens and Russ. (08/13/2012)
Secondary Voltages (78V monitor)
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- The widening of the voltage profile on March 19, 2010 corresponds with when we first started running the sequencer (and using the motors).
ISS Diode Voltages
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- How close can diode voltages get to 0 before we have problems? (08/13/2012)
- Why is there a two week trend? (08/13/2012)
- The top curve is when cal mode images are taken for calibration. (12/04/2012)
- Voltages have different offsets [due to intrinsic properties?]. (12/04/2012)
- 201308 - Diode3 is low and should be watched.
PS Commanded Delay
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- The Polarization Selector move times exhibit a slight temperature dependence (increasing times with decreasing temerature), as well as a small annual variation.
- The downward trend in PS 3 may be due to general "wearing in" of the motor.
- Is this trend going to be a problem? Dave Akin is contact. (05/29/2012)
- Bi-weekly changes in delay time is due to Detune calibration procedure (12/04/2012)
- 201308 - Notable difference in behavior at the time of the processor reset. Shorter delay, lubricant?
PS Table Size
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- Why is the limit 480? Should be less? (05/29/2012)
WT Commanded Delay
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- The Wavelength Tuner move times show small jumps in reaction to onboard tuning changes, which have occured on the following dates:
- 13-Dec-2010
- 13-Jul-2011
- The move times also exhibit a long-term drop due to motor wear, and bi-weekly dips during detune calibrations.
- Step size increases by a factor of 2 for each tuner.
WT Table Size
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- The Wavelength Tuner Adaptive Algorithm Table Size grows due to tuning changes, which have occured on the following dates:
- 13-Dec-2010
- 13-Jul-2011
- The maximum size allowed is 480.
- Why is the limit 480? Should be less? (05/29/2012)
Shutter Plots
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- This is the average of the shutter timer register values for the following parameters:
- HMI_SHM_IMG_CLOSE_BOTTOM - HMI_SHM_IMG_OPEN_BOTTOM
- HMI_SHM_IMG_CLOSE_MIDDLE - HMI_SHM_IMG_OPEN_MIDDLE
- HMI_SHM_IMG_CLOSE_TOP - HMI_SHM_IMG_OPEN_TOP
- Need to clean up the plots (fix range?) (05/29/2012)
- On March 29 there was a "blip", Zoe found the cause:
On 29-Mar-2012 19:30 UT until 30-Mar-2012 19:35 UT, HMI ran framelist:
This framelist is a calibration that measures linearity and takes a number of dark current images and light images with a range of exposures. The linearity calibration referenced exposure indices from 1 to 31 during the 24 hour period. (05/29/2012)# FTSID FrameList Cadence T_Offset T_Flags Repeat Skip 3034 lin_cal_6Cv02.f 135 0 DAY 1 39 - Jump in exposure time is to compensate for front window darkening. (12/04/2012)
- What is the cause for the change in quality for camera 1 in ~ Dec 2010? (12/04/2012)
Exposure Quality
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- This is a plot of the Shutter Exposure Time divided by the exposure time standard deviation.
- Need to clean up the plots (fix range?) (05/29/2012)
Leg Positions
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- The max number of steps is 1500. One step ~ 1/3 arcsec. Plot show how SC is deforming slightly from thermal changes throughout the year. (12/04/2012)
- 201308 - We should be able to fill in the gaps in 2012 and 2013. 2013 is likely due to the processor reset and some values may be outside of the plot limits.
Dark Currents
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- 201308 - Some discussion about the mean being the pedestal and why RMS is higher during eclipse season. RMS is affected by solar activity.
NPACKETS
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- This is a plot of every hour's median NPACKETS.
DATAMIN
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- This is a plot of how many times each hour the DATAMIN was less than 50.
- 20140708 - Y range set to 0-50.
PZT A Avg
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PZT B Avg
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PZT C Avg
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Best Focus Position
TopBest Focus Position
- The offset plot becomes more scattered with sunspots because the sharpness algorithm gets confused. Therefore the focus determination is really only accurate to +/- 1 focus step.
- The downward trend on the "temp corrected" best focus offset plot is due to front window darkening. This plot shows what the focus position would be had we not made temperature changes to keep it ~ 11.1 (12/04/2012)
- 201308 - Keeping in range using thermal control.
- 201308 - It was noted that the annual variation has less impact as the optics age.
Corrupt Images
TopCorrupt Images
- 201308 - Rate has dropped off recently. This may be related to solar activity.
- 201308 - It was noted that AIA camera 1 has seen no corrupt images.
Cal Mode Trend
TopCal Mode Trend
- 201308 - Plots have flattened out recently, with a larger variation between the front and side cameras.
Dopplergram Coverage
TopDopplergram Coverage
- 201308 - Notable drops due to a calibration run error in 2011 and the processor reset in 2013. Shorter EVE Cruciforms are also notable for shorter spikes in the plot.
Pointing Information
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- N/A
Velocity Drift
TopVelocity Drift
- The raw velocity plot width change is due to better job of fitting paramaters (Sebastian?) (12/04/2012)
- 201308 - Rate of change of Michelson drift is decreasing, won't need a tuning change for about a year.
- 201308 - Scatter around the time of the processor reset.
Clock Increment
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- Filter out bad point in mission long plots. (05/29/2012)
Timer Violations
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- HMI Timer Violations (HSQ204) Instrument Anomaly Report (IAR) #10: Timer violations of usually 1-2 ticks may be registered at the end of the calibration mode flat field frame list when it is run by timed script along with other weekly calibrations. This is likely due to slight variations in the time needed for data compression of the flat field and does not occur consistently when calibration sequences are run. Example ANS message received is: EGSE message: ERROR :stol_exec:19:36:57: EIP: ssim_tm: HSQ204 25009 Timer for frame 23 from framelist 1083 has been violated by 2 tick(s). See also https://hmi.lmsal.com/IAR/vcur/SDOIAR0010