MODIS FM1 (Aqua) SRCA Anomaly,

MODIS FM1 (Aqua) SRCA Anomaly, 2005-137
MODIS IOT: Bryan Breen & Tony Salerno Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

Information Archive All presentation material and related documentation, slides, spreadsheets, and/or graphs will be stored at the following FTP URL: ftp:// 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. Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

MODIS CP Macro 23 (SRCA Full Spatial) Commands
:33:11 SET MOD SR_IR_SRC TO OFF :33:11 SET MOD SR_SIPD_HTR TO OFF :33:11 SET MOD SR_LAMPLEVEL TO HIGH :33:11 STEP MOD SR_WHEEL BY 6 FORWARD :33:14 GET MOD CP_MTR_HOME WITH MTR 5, DIR 0 :33:29 STEP MOD SR_SLIT BY 6 FORWARD :33:32 GET MOD CP_MTR_HOME WITH MTR 6, DIR 0 :33:46 STEP MOD SR_GRT BY 6 FORWARD :33:49 GET MOD CP_MTR_HOME WITH MTR 7, DIR 0 :34:04 SET MOD SR_IR_SRC TO ON :34:04 STEP MOD SR_WHEEL BY D#080 FORWARD :34:04 SET MOD SR_SIPD_HTR TO ON :49:05 SET MOD FR_SR_DELAY TO 0 :49:05 SET MOD SR_LAMPS TO W30 :52:59 SET MOD FR_SR_DELAY TO 10 :53:55 SET MOD FR_SR_DELAY TO 20 :54:51 SET MOD FR_SR_DELAY TO 30 :55:47 SET MOD FR_SR_DELAY TO 40 :56:43 SET MOD FR_SR_DELAY TO 50 :57:39 SET MOD FR_SR_DELAY TO 0 :57:42 STEP MOD SR_SLIT BY 24 BACKWARD :59:17 SET MOD SR_LAMPS TO W20 :03:10 STEP MOD SR_SLIT BY 24 FORWARD :04:45 SET MOD FR_SR_DELAY TO 10 :05:41 SET MOD FR_SR_DELAY TO 20 :06:37 SET MOD FR_SR_DELAY TO 30 :07:33 SET MOD FR_SR_DELAY TO 40 :08:29 SET MOD FR_SR_DELAY TO 50 :09:25 SET MOD FR_SR_DELAY TO 0 :09:28 SET MOD SR_LAMPS TO W10 :13:21 SET MOD FR_SR_DELAY TO 10 :14:18 SET MOD FR_SR_DELAY TO 20 :15:14 SET MOD FR_SR_DELAY TO 30 :16:10 SET MOD FR_SR_DELAY TO 40 :17:06 SET MOD FR_SR_DELAY TO 50 :18:02 SET MOD FR_SR_DELAY TO 0 :18:05 STEP MOD SR_SLIT BY 24 BACKWARD :19:40 SET MOD SR_LAMPS TO OFF :19:56 SET MOD SR_LAMPS TO W1 :23:49 STEP MOD SR_SLIT BY 24 FORWARD :25:24 SET MOD FR_SR_DELAY TO 10 :26:20 SET MOD FR_SR_DELAY TO 20 :27:16 SET MOD FR_SR_DELAY TO 30 :28:12 SET MOD FR_SR_DELAY TO 40 :29:08 SET MOD FR_SR_DELAY TO 50 :30:04 SET MOD FR_SR_DELAY TO 0 :30:07 SET MOD SR_LAMPS TO OFF :30:24 SET MOD SR_MTR_GRP WITH WH 1, SL 1, GR 0 :31:21 TURN OFF MOD SR :31:21 CLOSE MOD CP_MACRO Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

Actions Taken Telemetry Analysis: anomalous SRCA Full Spatial 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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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). Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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) Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

Recovery Sequence - 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. Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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) Turn off 10W mode Configure for 10W lamp #3 Turn on 10W mode (10W #3) 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) Turn off 20W mode Configure for 30W lamp #1,3,4 Turn on 30W mode (10W #4) Turn off 30W mode Turn off SRCA Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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_setup('B',11,3,2,2,'RADIANCE','HIGH','ENABLE','ON') mod_srca_setup('B',11,3,1,2,'RADIANCE','HIGH','ENABLE','ON') mod_srca_lamps('20W') mod_srca_lamps('30W') mod_srca_pm_off() * may be skipped if all telemetry checks are ok (basically: is the SRCA still on?) Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 ~ W Lamp current All noted temperatures should begin dropping Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 ~ W 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 ~ W Lamp current MOD_TD_CE_CAL ~ 12 Calibration Electronics warm to about 12C with 10W Lamp Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 ~ W 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 ~ W Lamp current MOD_TD_CE_CAL ~ 16 Calibration Electronics warm to about 16C with 30W Lamp Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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" Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

Anomaly Resolution Team Meetings
Meetings Held: (May 20) 09:00 AM EDT – Cherry Room (June 1) 04:00 PM EDT – Cherry Room Meetings Planned: (June 22) 04:00 PM EDT – Cherry Room Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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_ ppt Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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 Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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. Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

Supporting Analysis Data
CP Command Echo: MOD_SS_CP_CMD_ECHO(RAW:HEX) :00: formatter night :20:02 184F turn on SRCA B :20: enable lamp over voltage shutdown :20: set SIS feedback to radiance :20: set 30W configuration :20: set 20W configuration :20: set 10W configuration :20: set 1W configuration :33:11 C017 run macro 23 :41: formatter day Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

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. Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

Lamp Usage Statistics (continued)
Lamp usage (as of 2005/137): Lamp 1 – hours (45.6 on orbit) Lamp 2 – hours (12.3 on orbit) Was taken offline due to lamp fluctuations, testing done on 2003/ Lamp 3 – 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 – hours (10 on orbit) Lamp 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. Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

Revision 3 MODIS FM1 (Aqua) SRCA Anomaly,

MODIS FM1 (Aqua) SRCA Anomaly,

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