MTA Trends/Derivatives

Provided below are trending and limit predictions for various Chandra subsystems. For each msid the data are plotted and the mean, standard deviation, and first and second derivatives are calculated. Two plots are displayed for each msid. Plot 1 includes data points, a first degree fit line (first derivative) extended out 6 months based on second derivative prediction, and a curve representing the data smoothed over a suitable period (10 or 30 days in most cases).
NEW! We have added min and max envelopes in dark blue to predict future limit violations. The envelopes are 4-th degree fits to the daily minimum and maximum value for each MSID.
Plot 2 shows the point-to-point slopes of the smoothed curve and a fit line (second derivative) to this data. Three iterations are performed, one with all data, one with daily minimum values, and one with daily maximum values.

NEW (03/27/07). The weekly plots indicate TSTART for observations as green ticks at the top of the plot. The shorter, orange ticks are CAL-ER observations.

Yellow

red

MEAN - the mean value is in violation (not applicable if no limits are defined)
RMS - the mean is within 1 sigma of a violation (not applicable if no limits are defined)
DELTA/YR (first derivative) - the overall trend (first degree fit to data) predicts a limit violation in the next 6 months. If no limits are defined, a red indication occurs if the overall trend predicts a 3 sigma change in the next 6 months. A yellow indication occurs for a 2 sigma change.
DELTA/YR/YR (second derivative) - the change in the overall trend predicts a trend that will trigger the first derivative indications described above.

Times are UT.

Last updated: 2009-Nov07-03:21 DOM 3759 (gratgen)
Data start: 2000-Aug12-22:40 DOM 386	Data end: 2009-Oct24-21:16 DOM 3746

Please select one of the following reports:

ACIS	All	Mins	Maxes	Yearly	Quarterly	Weekly
ACIS Thermal Control
ACIS Thermal Control vs. Sun angle
ACIS Electronics Side A
ACIS Electronics Side B
ACIS Mechanism Controller
DEA/DPA HK Temperatures
DEA/DPA HK Temperatures vs. Sun angle
DEA/DPA HK Electronics

COMP	All	Mins	Maxes	Yearly	Quarterly	Weekly
ACIS Electronics
ACIS Thermal
Ephin Key Rates L1
SIM Thermal Side A/B
HRMA Computed Averages

EPHIN	All	Mins	Maxes	Yearly	Quarterly	Weekly
EPHIN Housekeeping
EPHIN Temperatures and Voltages							TEPHIN Histogram
EPHIN Temperatures and Voltages vs. Sun angle
EPHIN Rates
EPHIN Key Rates
EPHIN Rates/Leakage Current vs. Temperature

AXIAL, RADIAL, DIAMETRAL GRADIENTS	All	Mins	Maxes	Yearly	Quarterly	Weekly
HRMA CAP
HRMA FAP
HRMA AFT Heater Plt.
HRMA H-Flexure
HRMA P-Flexure
HRMA PreCol. Baffle Plt
HRMA Struts
HSA Outer Cylinder
OBA AFT Inner Cyl.
OBA AFT Bulkhead
OBA Cone
OBA FWD Bulkhead
Periscope
Spacecraft Struts
TFTE

GRATINGS	All	Mins	Maxes	Yearly	Quarterly	Weekly
Grating Voltages and Rotation Angles

HRC	All	Mins	Maxes	Yearly	Quarterly	Weekly
HRC Temperatures
HRC Temperature vs. Sun angle
HRC Electronics
HRC-I in use
HRC-S in use
HRC not in use
HRC Veto Counting Rates
HRC Shield Rates vs. EPHIN rates
HRC Housekeeping

PCAD	All	Mins	Maxes	Yearly	Quarterly	Weekly
ACA Thermal
ACA Thermal vs. Sun Angle
IRU Temperatures and Electronics
PCAD Gyro Rates
FTS temp & gradient
FTS temp & gradient vs. Sun Angles
PCAD reaction wheel Rates
Drift rate updates to gyros
MUPS
MUPS vs. Sun angle

SIM	All	Mins	Maxes	Yearly	Quarterly	Weekly
SIM Thermal
SIM Temperature vs. Sun angle
SIM Electronics
SIM Actuator Use

SPC	All	Mins	Maxes	Yearly	Quarterly	Weekly
Battery Usage
Spacecraft Temperatures
sc_main_temp
sc_main_temp vs. Sun Angle
sc_anc_temp
sc_anc_temp vs. Sun Angle
batt_temp
batt_temp vs. Sun Angle
Spacecraft Electronics
Spacecraft Electronics Side A
Spacecraft Electronics Side B

OBA Thermal	All	Mins	Maxes	Yearly	Quarterly	Weekly
obaheaters
obagrad
hrmaheaters
hrmagrad

HRMA Thermal	All	Mins	Maxes	Yearly	Quarterly	Weekly
hrmatherm
hrmastruts
obfwdbulkhead
precoll

Maintained by bspitzbart - at - cfa.harvard.edu (Brad Spitzbart).