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Modis fm1 aqua srca anomaly 2005 137

MODIS FM1 (Aqua)SRCA Anomaly, 2005-137

MODIS IOT:

Bryan Breen & Tony Salerno

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Information archive
Information Archive

All presentation material and related documentation, slides, spreadsheets, and/or graphs will be stored at the following FTP URL:

ftp://www.mcst.ssai.biz/pub/permanent/IOT/pm1/analysis/2005-137_SRCA/

Access to the site is available via anonymous login.

(user name = “anonymous”, password = anything)

New or changed material in this presentation since the previous revision will be formatted in red.

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Description of event
Description of Event

  • On DOY 2005/137 at 01:07:30, during the 20W portion of the SRCA Full Spatial calibration, there was an abnormal output from the lamps.

    • Initial SRCA Setup commands executed as expected

    • Calibration’s 16 minute warm up executed as expected

    • 30W calibration (10 minutes) executed as expected

    • With 2 minutes remaining in the 20W calibration (10 minutes), lamp currents and voltages went to zero

    • 10W calibration (10 minutes) did not execute as expected, lamp currents and voltages did not rise above zero

    • 1W calibration (10 minutes) did not execute as expected, lamp currents and voltages did not rise above zero

    • SRCA Slit and Filter movements did execute as expected through entire calibration

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Elaboration of planned event
Elaboration of Planned Event

  • SRCA Full Spatial calibrations normally consist of the following:

    • MODIS MCL SRCA Setup Commands:

      • Turn on SRCA B

        • 2005/137 00:20:00 MOD_TURN_ON_SRB

      • Set SRCA Lamp Over Voltage Shutdown to Enable

        • 2005/137 00:20:03 MOD_SET_SR_LOV_SHDN TO=ENABLE

      • Set SRCA SIS Feedback Control to Radiance

        • 2005/137 00:20:06 MOD_SET_SR_SIS_FB TO=RADIANCE

      • Set SRCA 30W Lamp Configuration

        • 2005/137 00:20:09 MOD_SET_SR_L10WX3 TO=L_1_3_4

      • Set SRCA 20W Lamp Configuration

        • 2005/137 00:20:11 MOD_SET_SR_L10WX2 TO=L_3_4

      • Set SRCA 10W Lamp Configuration

        • 2005/137 00:20:13 MOD_SET_SR_L10WX1 TO=L_1

      • Set SRCA 1W Lamp Configuration

        • 2005/137 00:20:15 MOD_SET_SR_L1WX1 TO=L_5

    • MODIS MCL Activate ISC SCS 60 – SRCA Full Spatial:

      • Run MODIS CP Macro 23 (the only command in ISC SCS 60)

        • 2005/137 00:33:08 ISC_ACTIVATE_GENSCS SCSID=60

          • PM1_SCS_ISC_60_MOD_OA23_SRCA_FULL_SPAT

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Modis cp macro 23 srca full spatial commands
MODIS CP Macro 23 (SRCA Full Spatial) Commands

2005-137-00:33:11 SET MOD SR_IR_SRC TO OFF

2005-137-00:33:11 SET MOD SR_SIPD_HTR TO OFF

2005-137-00:33:11 SET MOD SR_LAMPLEVEL TO HIGH

2005-137-00:33:11 STEP MOD SR_WHEEL BY 6 FORWARD

2005-137-00:33:14 GET MOD CP_MTR_HOME WITH MTR 5, DIR 0

2005-137-00:33:29 STEP MOD SR_SLIT BY 6 FORWARD

2005-137-00:33:32 GET MOD CP_MTR_HOME WITH MTR 6, DIR 0

2005-137-00:33:46 STEP MOD SR_GRT BY 6 FORWARD

2005-137-00:33:49 GET MOD CP_MTR_HOME WITH MTR 7, DIR 0

2005-137-00:34:04 SET MOD SR_IR_SRC TO ON

2005-137-00:34:04 STEP MOD SR_WHEEL BY D#080 FORWARD

2005-137-00:34:04 SET MOD SR_SIPD_HTR TO ON

2005-137-00:49:05 SET MOD FR_SR_DELAY TO 0

2005-137-00:49:05 SET MOD SR_LAMPS TO W30

2005-137-00:52:59 SET MOD FR_SR_DELAY TO 10

2005-137-00:53:55 SET MOD FR_SR_DELAY TO 20

2005-137-00:54:51 SET MOD FR_SR_DELAY TO 30

2005-137-00:55:47 SET MOD FR_SR_DELAY TO 40

2005-137-00:56:43 SET MOD FR_SR_DELAY TO 50

2005-137-00:57:39 SET MOD FR_SR_DELAY TO 0

2005-137-00:57:42 STEP MOD SR_SLIT BY 24 BACKWARD

2005-137-00:59:17 SET MOD SR_LAMPS TO W20

2005-137-01:03:10 STEP MOD SR_SLIT BY 24 FORWARD

2005-137-01:04:45 SET MOD FR_SR_DELAY TO 10

2005-137-01:05:41 SET MOD FR_SR_DELAY TO 20

2005-137-01:06:37 SET MOD FR_SR_DELAY TO 30

2005-137-01:07:33 SET MOD FR_SR_DELAY TO 40

2005-137-01:08:29 SET MOD FR_SR_DELAY TO 50

2005-137-01:09:25 SET MOD FR_SR_DELAY TO 0

2005-137-01:09:28 SET MOD SR_LAMPS TO W10

2005-137-01:13:21 SET MOD FR_SR_DELAY TO 10

2005-137-01:14:18 SET MOD FR_SR_DELAY TO 20

2005-137-01:15:14 SET MOD FR_SR_DELAY TO 30

2005-137-01:16:10 SET MOD FR_SR_DELAY TO 40

2005-137-01:17:06 SET MOD FR_SR_DELAY TO 50

2005-137-01:18:02 SET MOD FR_SR_DELAY TO 0

2005-137-01:18:05 STEP MOD SR_SLIT BY 24 BACKWARD

2005-137-01:19:40 SET MOD SR_LAMPS TO OFF

2005-137-01:19:56 SET MOD SR_LAMPS TO W1

2005-137-01:23:49 STEP MOD SR_SLIT BY 24 FORWARD

2005-137-01:25:24 SET MOD FR_SR_DELAY TO 10

2005-137-01:26:20 SET MOD FR_SR_DELAY TO 20

2005-137-01:27:16 SET MOD FR_SR_DELAY TO 30

2005-137-01:28:12 SET MOD FR_SR_DELAY TO 40

2005-137-01:29:08 SET MOD FR_SR_DELAY TO 50

2005-137-01:30:04 SET MOD FR_SR_DELAY TO 0

2005-137-01:30:07 SET MOD SR_LAMPS TO OFF

2005-137-01:30:24 SET MOD SR_MTR_GRP WITH WH 1, SL 1, GR 0

2005-137-01:31:21 TURN OFF MOD SR

2005-137-01:31:21 CLOSE MOD CP_MACRO

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Actions taken
Actions Taken

  • Telemetry Analysis:

    • 2005-137 anomalous SRCA Full Spatial

    • 2005-076 previous (successful) SRCA Full Spatial

  • Contacted:

    • Aqua FOT

      • Bill Guit, Joe Purcell, John Nidhiry

    • MCST

      • Jack Xiong, Nianzeng Che, David Moyer

    • Instrument Provider (SBRS)

      • Roger Drake, Joe Auchter, Erik Johnson

    • MODIS Science Team

      • Vincent Salomonson, Bill Barnes, Ken Anderson, Mike Roberto

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Current understanding of possible cause s
Current Understanding of Possible Cause(s)

  • Lamp Failure?

    • Unlikely that one or both of the 10W lamps #3 and #4 failing would effect the unpowered 10W lamp #1 and 1W lamp #5 (primary 1W).

    • It is possible that one (or more) of the lamps began to fail causing the suspected Over Voltage protection elaborated on below.

  • Total SRCA Failure?

    • No. Continued functioning of the SRCA motors and active thermal sensors indicate the SRCA is functioning (at some level).

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Current understanding of possible cause s continued
Current Understanding of Possible Cause(s) (continued)

  • Lamp Over Voltage tripped protection circuitry/software?

    • Most likely explanation – supported by SBRS review of symptoms

    • Over Voltage protection cuts power to the lamp ring effecting all lamps, the remaining functions of the SRCA are unaffected

      • fits observed telemetry

      • Awaiting SBRS confirmation of Over Voltage Protection sequence

    • Over Voltage protection is a soft lock up, it is reset when power to the SRCA is cycled

      • SRCA B is currently off (as per final command in the CP Macro 23)

    • Erik Johnson (SRCA designer) spoke with Joe Auchter (both of SBRS) and described a possible failure of an SRCA lamp beginning with a rise in current and voltage that could trip the over voltage protection.

      • MCST noted a small variance in SRCA lamp output during the 2005/123 Radiometric test, they were awaiting the 2005/137 test for additional data

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Immediate plan of action
Immediate Plan of Action

  • Assess state of health of the instrument

    • Telemetry nominal - subsystems show no signs of problems

  • Explore scenarios of SRCA lamps being disabled while remaining SRCA equipment remains functional

    • Inquiry requested of SBRS regarding this issue

      • Joe Auchter is reviewing the SRCA Lamp Over Voltage Protection Software

      • Latest input from SBRS suggest the symptoms seen are that which are expected of an Over-Voltage Shutdown

  • Determine impact on science data from the loss of the planned SRCA Full Spatial Calibration and any future SRCA calibrations

    • Inquiry requested of MCST regarding this issue

      • MCST indicates no impact to Science Data from an SRCA loss

      • SRCA is used to trend and characterize, not for calibration of science data

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Immediate plan of action continued
Immediate Plan of Action (continued)

  • Suspension of future SRCA activities until course of resolution has been determined.

    • The next regularly scheduled SRCA activity was to be an SRCA Full Radiometric calibration in the first week of June.

      • MCST has indicated that there will be no adverse effect on the characterization of the instrument from not performing this activity

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


System experts contacted or needed
System Experts Contacted or Needed

  • MODIS Flight Software: Joe Auchter of SBRS

  • MODIS Overall System Design: Roger Drake of SBRS

  • MODIS SRCA Designer: Erik Johnson of SBRS (via Joe Auchter)

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Impact to science data
Impact to Science Data

  • The SRCA is used as a characterization tool for the long term performance of the MODIS instrument.

    • Data from the SRCA is not used in any current Science Data products

    • Loss of the SRCA will not impact Science Data

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Course of action
Course of Action

  • Additional telemetry analysis?

    • Awaiting recommendations for any additional data to analyze outside of the current set of processed data.

  • Tests to conduct?

    • Power on the SRCA

      • Power 1 or more 10W and 1W lamps

      • Test sequence on following pages

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Recovery sequence goals
Recovery Sequence - Goals

  • Goals:

    • To test each of the SRCA lamps; individually and under increasing load configurations. The lamp combinations used for the 20W and 30W configurations shall be those used for nominal activities.

    • Monitoring and commanding in real time the power on, setup/configuration, and toggling on and off of the various SRCA components and lamps.

    • Monitoring of real time telemetry indicating success or failure of aforementioned goals as well as detecting possible lamp shutdown should an over voltage protection circuit trip occur.

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Recovery sequence step descriptions

Desired Sequence:

Configure for 1W lamp #1

(and turn on SRCA B)

Turn on 1W mode (1W #1)

Observe for 5 minutes

Turn off 1W mode

Configure for 10W lamp #1

Turn on 10W mode (10W #1)

Observe for 5 minutes

Turn off 10W mode

Configure for 10W lamp #3

Turn on 10W mode (10W #3)

Observe for 5 minutes

Turn off 10W mode

Desired Sequence (continued):

Configure for 10W lamp #4

Turn on 10W mode (10W #4)

Observe for 5 minutes

Turn off 10W mode

Configure for 20W lamp #3,4

Turn on 20W mode (10W #3,4)

Observe for 5 minutes

Turn off 20W mode

Configure for 30W lamp #1,3,4

Turn on 30W mode (10W #4)

Observe for 5 minutes

Turn off 30W mode

Turn off SRCA

Recovery Sequence – Step Descriptions

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Recovery sequence procedure outline
Recovery Sequence – Procedure Outline

  • Procedure List (no execution breaks):

    mod_srca_setup('B',11,3,8,2,'RADIANCE','HIGH','ENABLE','ON')

    mod_srca_lamps('1W')

    mod_srca_lamps('OFF')

    mod_srca_setup('B',11,3,8,2,'RADIANCE','HIGH','ENABLE','ON') *

    mod_srca_lamps('10W')

    mod_srca_lamps('OFF')

    mod_srca_setup('B',11,3,2,2,'RADIANCE','HIGH','ENABLE','ON')

    mod_srca_lamps('10W')

    mod_srca_lamps('OFF')

    mod_srca_setup('B',11,3,1,2,'RADIANCE','HIGH','ENABLE','ON')

    mod_srca_lamps('10W')

    mod_srca_lamps('OFF')

    mod_srca_setup('B',11,3,8,2,'RADIANCE','HIGH','ENABLE','ON') *

    mod_srca_lamps('20W')

    mod_srca_lamps('OFF')

    mod_srca_setup('B',11,3,8,2,'RADIANCE','HIGH','ENABLE','ON') *

    mod_srca_lamps('30W')

    mod_srca_lamps('OFF')

    mod_srca_pm_off()

    * may be skipped if all telemetry checks are ok (basically: is the SRCA still on?)

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Recovery sequence extra steps
Recovery Sequence – Extra Steps

  • Pause Between Contacts:

    • ... after "Turn off ___ mode"

    • Turn off SRCA

      • mod_srca_pm_off()

    • ... new contact "Configure ..." will turn on the SRCA again.

  • Additionally, place an MCL SRCA Off activity after every contact planned to have SRCA activities.

    • This protects against loss of contact prior to being able to power off the SRCA

      • MOD_SRCA_OFF

        • Runs MODIS CP Macro #27 “SRCA Off”

        • Completely benign if the SRCA is already powered off

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Recovery sequence success indicators
Recovery Sequence – Success Indicators

  • Configuration:

    • MOD_CR_SR_B_ON = ON SRCA B is on

    • MOD_CR_SR_L_SHDN_ENA = ENABLED Lamp Over Voltage Shutdown Enabled

    • MOD_CR_SR_SISFB_RAD = RADIATIVE SIS (Spherical Integrating Sphere) Feed Back set to Radiance

    • MOD_CR_SR_USE_L10WX3 = 11 30W using lamps 1,3,4 (binary 1011)

    • MOD_CR_SR_USE_L10WX2 = 3 20W using lamps 3,4 (binary 0011)

    • MOD_CR_SR_USE_L10WX1 = 8,2,1 10W using lamps 1,3,4 (binary 1000,0010,0001 respectively)

    • MOD_CR_SR_USE_L1WX1 = 2 1W using lamp 1 (binary 10)

    • MOD_CR_SR_SISHTR_OFF = ON SIS Heater On

    • MOD_CR_SR_LAMPS_LOW = HIGH SRCA Lamps running at full power

    • MOD_TA_SR_SRC_B_SIPD ~ 66 Feedback diode temperature rise to and levels off around 66C

    • MOD_TD_SR_GRAT_ELEX ~ 18 Internal motor electronics warm up (absorbing energy)

    • MOD_TD_CE_CAL ~ 7 Calibration Electronics warm to about 7C with SRCA powered

  • Turn off lamp modes:

    • MOD_CS_SR_LAMPS = OFF All lamps are switched off

    • MOD_IR_SR_1WLB_CURH ~ 0.0 1W Lamp current

    • MOD_IR_SR_10WLB_CURH ~ 0.0 10W Lamp current

    • All noted temperatures should begin dropping

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Recovery sequence success indicators continued
Recovery Sequence – Success Indicators (continued)

  • Turn on 1W mode:

    • MOD_CS_SR_LAMPS = WATT_ONE 1W Lamp is switched on

    • MOD_IR_SR_1WLB_CURH ~ 0.17-0.18 1W Lamp current

    • MOD_TD_SR_LAMP_RING - rising Lamp Ring temperature will rise quickly to 20-40C (roughly proportional to lamp output wattage and duration)

    • MOD_TD_CE_CAL ~ 10 Calibration Electronics warm to about 10C with 1W Lamp

    • MOD_TD_PS2_CVTR_SW ~ +2 Power Supply component rise (increased current draw)

    • MOD_TD_PS2_DIODE_OUT ~ +2 Power Supply component rise (increased current draw)

    • MOD_TD_PS2_PRELOAD ~ +1 Power Supply component rise (increased current draw)

  • Turn on 10W mode:

    • MOD_CS_SR_LAMPS = WATT10 10W Lamp is switched on

    • MOD_IR_SR_10WLB_CURH ~ 2.0-2.2 10W Lamp current

    • MOD_TD_SR_LAMP_RING - rising Lamp Ring temperature will rise quickly to 20-40C (roughly proportional to lamp output wattage and duration)

    • MOD_TD_CE_CAL ~ 12 Calibration Electronics warm to about 12C with 10W Lamp

    • MOD_TD_PS2_CVTR_SW ~ +2 Power Supply component rise (increased current draw)

    • MOD_TD_PS2_DIODE_OUT ~ +2 Power Supply component rise (increased current draw)

    • MOD_TD_PS2_PRELOAD ~ +1 Power Supply component rise (increased current draw)

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Recovery sequence success indicators continued1
Recovery Sequence – Success Indicators (continued)

  • Turn on 20W mode:

    • MOD_CS_SR_LAMPS = WATT20 20W Lamp Group is switched on

    • MOD_IR_SR_10WLB_CURH ~ 4.0-4.2 20W Lamp current

    • MOD_TD_SR_LAMP_RING - rising Lamp Ring temperature will rise quickly to 20-40C (roughly proportional to lamp output wattage and duration)

    • MOD_TD_CE_CAL ~ 14 Calibration Electronics warm to about 14C with 20W Lamp

    • MOD_TD_PS2_CVTR_SW ~ +2 Power Supply component rise (increased current draw)

    • MOD_TD_PS2_DIODE_OUT ~ +2 Power Supply component rise (increased current draw)

    • MOD_TD_PS2_PRELOAD ~ +1 Power Supply component rise (increased current draw)

  • Turn on 30W mode:

    • MOD_CS_SR_LAMPS = WATT30 30W Lamp Group is switched on

    • MOD_IR_SR_10WLB_CURH ~ 6.0-6.3 30W Lamp current

    • MOD_TD_SR_LAMP_RING - rising Lamp Ring temperature will rise quickly to 20-40C (roughly proportional to lamp output wattage and duration)

    • MOD_TD_CE_CAL ~ 16 Calibration Electronics warm to about 16C with 30W Lamp

    • MOD_TD_PS2_CVTR_SW ~ +2 Power Supply component rise (increased current draw)

    • MOD_TD_PS2_DIODE_OUT ~ +2 Power Supply component rise (increased current draw)

    • MOD_TD_PS2_PRELOAD ~ +1 Power Supply component rise (increased current draw)

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Recovery sequence contingency steps
Recovery Sequence – Contingency Steps

  • If any step fails or the output from the lamp(s) appears to cut out during the "pause":

    • mod_srca_pm_off()

      • MOD_CR_SR_A_ON = 'OFF' SRCA A Side Off

      • MOD_CR_SR_B_ON = 'OFF' SRCA B Side Off

      • All other relays and software settings are reset/verified upon re-powering the SRCA

      • Active (TA, IR, CS) internal SRCA telemetry is not valid when both SRCA circuits are unpowered

      • Passive (TD) temperatures are the only valid internal SRCA telemetry when the SRCA is "off"

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Recovery sequence constraints
Recovery Sequence – Constraints

  • Constraints for execution:

    • No other running MODIS Activities

    • Day/Night? (SRCA calibrations are nominally run at S/C Night to reduce stray light noise)

    • Execution preferred during a TDRSS contact to avoid conflicts with science data playbacks in ground contacts.

      • Each “block” of lamp settings requires approximately 10-12 minutes of execution and observation time

      • There are SIX “blocks” of lamp settings

      • SRCA turn off procedure requires approximates 2 minutes

      • SRCA Off MCL SCS must be scheduled for any contact executing real time SRCA commanding

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Available action options real time commands
Available Action Options (Real-Time Commands)

  • Real-Time Procedures

    • MOD_SRCA_SETUP - power on and configure the SRCA

    • MOD_SRCA_LAMPS - turns on and off any configuration of the lamps

    • MOD_SRCA_PM_OFF - power off the SRCA

    • MOD_SRCA_IR_SRC - turn the IR source on/off

    • MOD_SRCA_GRAT_BURST - moves the grating in bursts

    • MOD_SRCA_HOME - turns on the SRCA, moves the motors home, turns off the SRCA

    • MOD_SRCA_MOTOR_GROUP - moves the SRCA motors to specified positions

    • MOD_STEP_MOTOR - moves the SRCA motors specific step counts

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Available action options mcl activities
Available Action Options (MCL Activities)

MOD_OA20_SRCA_10W_RAD

MOD_OA20_SRCA_10W_RAD_CUR

MOD_OA21_SRCA_1W_RAD

MOD_OA21_SRCA_1W_RAD_CUR

MOD_OA22_SRCA_FULL_SPECT_1

MOD_OA22_SRCA_FULL_SPECT_2

MOD_OA22_SRCA_FULL_SPECT_3

MOD_OA22_SRCA_FULL_SPECT_4

MOD_OA23_SRCA_FULL_SPAT

MOD_OA23_SRCA_FULL_SPAT_ND

MOD_OA23_SRCA_SPAT_01KM_P1V1

MOD_OA23_SRCA_SPAT_01KM_P2V1

MOD_OA24_SRCA_ASCAN_SPAT

MOD_OA25_SRCA_10W_SPAD_ND

MOD_OA25_SRCA_1W_SPAD

MOD_OA25_SRCA_1W_SPAD_ND

MOD_OA30_SRCA_XTALK_TEST1_1B

MOD_OA30_SRCA_XTALK_TEST1_2B

MOD_OA30_SRCA_XTALK_TEST1_3B

MOD_OA30_SRCA_XTALK_TEST2_1B

MOD_OA30_SRCA_XTALK_TEST2_2B

MOD_OA30_XTALK_TEST3_1B

MOD_OA30_XTALK_TEST3_2B

MOD_SRCA_OFF

MOD_SRCA_SETUP

MOD_SRCA_SETUP_10WL2_1WL6

MOD_SRCA_SETUP_10W_L2

MOD_SRCA_SETUP_10W_L3

MOD_SRCA_SETUP_10W_L4

MOD_SRCA_SETUP_NO_L2

MOD_SRCA_SPECIAL_10WND

MOD_SRCA_SPECIAL_10W_OPEN

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Available action options stored commands
Available Action Options (Stored Commands)

  • ISC SCSes:

    • PM1_SCS_ISC_59_MOD_OA19_SRCA_FULL_RAD

    • PM1_SCS_ISC_60_MOD_OA23_SRCA_FULL_SPAT

    • PM1_SCS_ISC_63_MOD_OA25_SRCA_1W_SPAT

    • PM1_SCS_ISC_72_MOD_OA20_SRCA_10W_RAD

    • PM1_SCS_ISC_73_MOD_OA20_SRCA_10W_RAD_CUR

    • PM1_SCS_ISC_74_MOD_OA21_SRCA_1W_RAD_V2

    • PM1_SCS_ISC_75_MOD_OA21_SRCA_1W_RAD_CUR_V2

    • PM1_SCS_ISC_76_MOD_OA22_SRCA_FULL_SPECT_1

    • PM1_SCS_ISC_77_MOD_OA22_SRCA_FULL_SPECT_2

    • PM1_SCS_ISC_78_MOD_OA22_SRCA_FULL_SPECT_3

    • PM1_SCS_ISC_79_MOD_OA22_SRCA_FULL_SPECT_4

    • PM1_SCS_ISC_80_MOD_OA24_SRCA_ASCAN_SPAT

    • PM1_SCS_ISC_151_MOD_OA25_SRCA_10W_SPAT_ND

    • PM1_SCS_ISC_151_MOD_OA25_SRCA_1W_SPAT_ND

    • PM1_SCS_ISC_201_MOD_OA23_SRCA_FULL_SPAT_ND

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Anomaly resolution team meetings
Anomaly Resolution Team Meetings

  • Meetings Held:

    • 2005-140 (May 20) 09:00 AM EDT – Cherry Room

    • 2005-152 (June 1) 04:00 PM EDT – Cherry Room

  • Meetings Planned:

    • 2005-173 (June 22) 04:00 PM EDT – Cherry Room

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Action items
Action Items

  • Open: SBRS to further look into the workings of the Over Voltage protection circuit. (2005/140)

    • Awaiting status/input from Eric Johnson

  • Closed: MCST and MODIS IOT will compare data from this anomalous SRCA Spatial calibration and the last successful SRCA Spatial calibration. (2005/140)

    • Comparison conducted, performance of activities look similar up to point of lamp shut off on the 2005/137 activity.

    • MCST presentation material available on FTP site: abnormal_2005137.ppt

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Action items continued
Action Items (continued)

  • Closed: MODIS IOT will analyze currents, voltages, and temperatures of the most recent SRCA Full Radiometric calibration. (2005/140)

    • analysis presented in supporting data at the end of this presentation

  • Open: MODIS IOT will put together a block diagram of the SRCA circuitry. (2005/140)

    • engineering drawings acquired on 2005/152

    • IOT still attempting to identify what pertinent information exists (if any) to assist in diagramming the SRCA circuitry

      • Minimal data available/identifiable for SRCA circuitry

  • Closed: MODIS IOT will put together a summary about the SRCA. (2005/140)

    • presented as supplemental documentation

    • available on FTP site: MODIS_SRCA_Summary.doc

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Action items continued1
Action Items (continued)

  • Open: MODIS IOT will create a recovery sequence plan. (2005/152)

    • Supplied in this document

    • Open for review/comment/approval

  • Closed: SBRS to provide details regarding PSR EFR record of early testing witness of similar (suspected) over voltage protection trip. (2005/152)

    • Two faxes provided by Roger Drake with the details of the PSR EFR have been appended to the end of this presentation.

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Supporting analysis data
Supporting Analysis Data

CP Command Echo:

MOD_SS_CP_CMD_ECHO(RAW:HEX)

2005-137-00:00:00 6117 formatter night

2005-137-00:20:02 184F turn on SRCA B

2005-137-00:20:05 6149 enable lamp over voltage shutdown

2005-137-00:20:08 6148 set SIS feedback to radiance

2005-137-00:20:11 6112 set 30W configuration

2005-137-00:20:14 6113 set 20W configuration

2005-137-00:20:16 6114 set 10W configuration

2005-137-00:20:17 6115 set 1W configuration

2005-137-00:33:11 C017 run macro 23

2005-137-00:41:24 6117 formatter day

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Lamp usage statistics
Lamp Usage Statistics

  • During the SRCA Full Spatial calibration, the SRCA utilizes three 10W lamps and one 1W lamp, as well as the IR source. The 10W lamps are used for 30W, 20W, and 10W light sources, and the 1W for a 1W light source as follows:

    • 30W = Lamps 1, 3, 4

    • 20W = Lamps 3, 4

    • 10W = Lamp 1

    • 1W = Lamp 5

    • anomaly happened 8 minutes into 20W portion, lamps being used were 3 and 4.

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137


Lamp usage statistics continued
Lamp Usage Statistics (continued)

  • Lamp usage (as of 2005/137):

    • Lamp 1 – 245.8 hours (45.6 on orbit)

    • Lamp 2 – 188.0 hours (12.3 on orbit)

      • Was taken offline due to lamp fluctuations, testing done on 2003/076-077

    • Lamp 3 – 205.7 hours (27.2 on orbit)

    • Lamp 4 – 82.5 hours (24.8 on orbit)

      • Previous backup lamp, now in full use since Lamp 2 was taken offline

    • Lamp 5 – 509.5 hours (10 on orbit)

    • Lamp 6 – 271.6 hours (1.8 on orbit)

      • Backup 1W lamp

  • Each 10W lamp has a limited life of 500 hours

  • Each 1W lamp has a limited life of 5000 hours

  • If it was an over voltage shutdown, logic points towards lamp 3 being the culprit since it has many more hours on it than lamp 4.

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137
















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