@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ @ @ MTA Monitoring Report 2/27/00- 3/2/00 @ @ @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ This is the M&TA weekly report. We will be sending this out once a week to summarize MTA observations of the spacecraft. As this is the first one We are keeping the mailing down, next week we expect to send this to sot,fot. Typical sections will be: Problem Tracking Trending CTI Photons (not until next week) Telemetry MTA Software status Reports will be filed at: http://asc.harvard.edu/mta/REPORTS/weekly.html *************** MTA Problem Tracking. ***************** No new problem is reported this week. All red alarts due to safe mode are closed. ******** Trending *********** Bus voltage is going back up - ----------- Bus Voltage - ----------- >From Scott J. Work: Hi Wallace, I was checking the trending on the main system voltages (ELBV and ACIS(1DP28A/BVO, 1DE28A/BVO) /HRC). They steadily dropped about 3% (1 Volt) from launch until the end of the year and now are going back up at about the same rate. I am a little confused as to why. We just past our closest approach to the Sun and are now heading away, so why is more voltage (and power) now available? Paul told be you said we were right on the prediction, can you send be a formula which tells me the prediction? thanks, Scott P.S. I also notice the HRMA Power peaked around Jan 1 and is now dropping. Is this releated? ----------- >From Mark D. Freeman: scott, i'm not sure, and i think that Wallace will answer before you can blink, but it may be that array efficiency drops faster with inc. temp. than power increases with the solar constant, so there is some net change in output. there certainly is the clearest seasonal variation of any measurement in the array temperatures - check out TSAPYT_AVG and TSAMYT_AVG on p. 16 in your S/C trends graphs. btw, why is it that somewhere around day 365 (jan. 1?) the data for things like OBA gradients goes from being clearly resolution-limited to a more scattered appearance? and a useful parameter to trend would be the power into major sections of the OBA heaters, particularly the sun-side zones (where it may degrade the silver teflon and/or solar constant is varying vs. the anti-sun side of the bench where none of this should be happening.) there's limited use for temperature data where it's well controlled - power's much more interesting... - - -mark ************ CTI trend ************* ccds 5/7 (S1/3) is slightly higher cti after focal plane temp down to - -120C, but it stays steady at a same level. - code note: The current code has some problems with the BSI chips. This has been address and we hope that it is in dsops next week. ************* Telemetry *********** HIGHLIGHTS: * It seems that HRMA gradients have some problems to stay in limits. * HRC Electonics IMHBLV: 100% red @ 105/106 IMHVLV: 100% red @ 99/100 RSRFALV: 100% red @ 185 code notes: -We may need to fix it limits if these values are acceptable. -We are also in the process of adjusting the limits for the gradient groups. -A new catagory, called comps is in the late stages of development and we look forward to testing it by April 1. LIMIT VIOLATIONS Acis Electronics Side B - ----------------------- 1DAHBVO0 23% yellow dip but it was backed up to a normal range. (3/2/00) Ephin - ----- 2/28 HKABIASLEAKI: 0.19% yellow. two peaks, one hit yellow. Grating - ------- 3/2 4MP28AV: short time jump (0.29%) to 28.21V 4MP5AV : short time jump (0.29%) to 5.02V 3/1 4MP28AV/4MP5AV/4MP28BV: 0.67% red a few jumps into red HRC electronics - ---------------- all week IMHBLV : 100% red 105.0 and 106.0 IMHVLV: 100% red 99 and 100 RSRFALV: 100% red @ 185.0 3/2 2DETART/2DETBRT: plot mistakes PCAD gyro rate - -------------- 3/2 AI1AX1Y/AI1AX2Y a jump (0.32%) to yellow range. 3/1 AI1AX1X/AI1AX2X: 0.332% yellow several peaks. 2/28 AI1AX1X/AI1AX2Y 0.10% yellow a few dips SIM Thermal - ------------ 3/2 FAMTRTEMP: short jump to red (0.12%). 3/1 FAMTRTEMP: 0.09% red one peak 2/27 FAMTRTEMP: 0.10% red; a few jumps into red. Spacecraft electronics - ---------------------- 3/2 OOBAPWR: jump at the end of the period to red zone (1.40%)peaked @800 AWD4TQI/AWD1TQI/AWD3TQI/AWD6TQI two fluctuation hit yellow range (0.5%). ELBI :jump at the end of the period to red zone (1.42%) peaked @ 90 3/1 OOBAPWR: 1.23% red, 0.02% yellw: one sharp peak into red @800 AWD3TQI/AWD6TQI /AWD1TQI/AWD4TQI:0.12-0.58% yellow, a few peaks into yellow ELBI: 0.99% red, 0.07% yellow, a shapr peak into red around 95 2/28 AWD1TQI: 0.33% yellow 2 spikes AWD4TQI: 0.12% yellow