NOAA Office of Satellite and Product Operations

NOAA 18 MHS Subsystem Summary

Component Description Status
CHANNEL H1Channel H1 (89.0 GHz)Green
CHANNEL H2Channel H2 (157.0 GHz)Green
CHANNEL H3Channel H3 (183.3 GHz)Green
CHANNEL H4Channel H4 (183.3 GHz)Green
CHANNEL H5Channel H5 (190.3 GHz)Green
DC CONVTRDC/DC ConverterGreen
FDMFlywheel Driver MotorGreen
FDM MTR SENSORFlywheel Drive Motor SensorGreen
FDM ZPSFlywheel Driver Motor Zero Position SensorGreen
H1 LOH1 Local OscillatorGreen
H2 LOH2 Local OscillatorGreen
H3-H4 LOH3/H4 Local OscillatorGreen
H5 LOH5 Local OscillatorGreen
PIEProcessor/Interface ElectronicsGreen
RDMReflector Drive MotorGreen
RDM MTR SENSORReflector Drive Motor SensorGreen
RDM ZPSReflector Drive Motor Zero Position SensorGreen
SCEScan Control ElectronicsGreen
SPESignal Processing ElectronicsGreen


Subsystem History:

Date Time Component Description
06/09/201615:32:09CHANNEL H4Sets Channel H4 gain to 2dB
06/09/201615:27:11CHANNEL H3Sets Channel H3 gain to 1dB
06/08/201615:45:52CHANNEL H4Resets Channel H4 gain to 0dB
06/08/201615:44:06CHANNEL H3Resets Channel H3 gain to 0dB
06/08/201615:37:49H3-H4 LOSwap oscillator from side A to side B
04/28/201608:08:31CHANNEL H3Channel H3 experienced a DC Offset, increased by 5 counts
04/23/201607:26:00CHANNEL H3Channel H4 experienced a DC Offset, increased by 4 counts
04/20/201604:11:14CHANNEL H3Channel H3 experienced a DC Offset, increased by 3 counts
04/12/201603:52:00CHANNEL H3Channel H3 experienced a DC Offset, decreased by 2 counts
03/30/201602:49:00CHANNEL H3Channel H3 experienced a DC Offset, decreased by 2 counts
03/22/201618:03:00Channel H3Channel H3 experienced a DC Offset, lowered by 1 count
02/27/201617:12:00CHANNEL H3Channel H3 experienced a DC Offset, increased by 4 counts
12/15/201515:15:00CHANNEL H3Channel H3 experienced a DC Offset, lowered by 2 counts
09/23/201511:20:00CHANNEL H45 count DC offset experienced by Channel H4
09/16/201523:42:59CHANNEL H13 count DC offset experienced by Channel H1
09/15/201512:07:09CHANNEL H35 count DC offset experienced by Channel H3
08/27/201522:27:25CHANNEL H37 count DC offset experienced by Channel H3
08/22/201523:34:00CHANNEL H47 count DC offset experienced by Channel H4
04/27/201504:41:00CHANNEL H47 count DC offset experienced by Channel H4
04/22/201505:35:00CHANNEL H5Two count DC Offset experienced
04/04/201505:11:00CHANNEL H3Automatic DC Offset of 4 counts; more noticeable in space position and blackbody counts for Channel H3
02/20/201509:30:00CHANNEL H3Blackbody 2 reached the top 95% of counts causing an automatic DC offset. Instrument nominal.
02/18/201515:50:00RDMRDM current increased slightly causing the current profile to increase about 40mA
02/13/201509:39:00FDMFDM current increased to a maximum value of 1070mA and continues to have a noisier current value with more values reaching 1000mA.
02/13/201502:00:00RDMAverage current profile increased from around 760mA to 850mA for the RDM.
01/01/201512:00:00FDMNOAA-18 MHS Flywheel drive motor current surges started started consistently passing 1000mA in December 2013 and continued throughout 2014. The FDM current is known to be erratic, so far for 2015 the current signature has calmed.
11/27/201416:10:00CHANNEL H3Channel H3 experienced a DC offset, SP3 hit the 5% lower deadband
11/09/201406:10:00CHANNEL H3Channel H3 experienced a DC offset, SP1 hit the 5% lower deadband
10/19/201423:08:00CHANNEL H3N18 MHS Channel H3 experienced a DC offset, BB1 hit the 95% upper deadband
10/18/201423:26:00CHANNEL H5BlackBody and Space Position counts experienced a slight drop in counts, radiometrics decreased slightly for about 4 minutes before returning back to expected behavior
09/21/201423:31:00CHANNEL H3MHS Channel H3 experienced a DC offset, BB1 hit the 95% upper deadband
07/16/201409:00:00FDMFDM current had an overall increase seen in its behavior, reaching a mA value in the mid 1000s daily
01/04/201420:00:41CHANNEL H5Automatic DC Offset occured; Correction of 2 counts, radiometrics increased by ~3,000
12/03/201319:15:00FDMFDM began to experience periodic instances where the current would surge above 1000mA
09/24/201318:00:00RDMReflector Motor had a brief current surge. All other values appear nominal
08/02/201311:46:00CHANNEL H1Channel H1 Blackbody and Space Position radiometric experienced a decrease in counts; just over 1600 counts for both Blackbody and Space Position -- automatic DAC Offset Earth View Radiometrics crossed upper dead band when N18 above Iran
08/02/201311:46:00CHANNEL H2Channel H2 Blackbody, Space Position, and Earth Radiometrics all experienced a decrease in counts; just under 5000 counts for both Blackbody and Space Position, and around 4000 counts for Earth view counts - automatic DAC Offset Earth View Radiometrics crossed upper dead band when N18 above Iran
07/24/201317:11:28 Place the MHS into Scan Mode
07/24/201317:09:05 Dump all of the MHS Tables
07/24/201317:08:14 Adjust the MHS TL87, TL88, TL90, TL91
07/24/201317:06:05 Place MHS into Standby Mode
07/01/201319:34:57 MHS to scan mode
07/01/201319:34:01 Dumped the limits table
07/01/201319:31:25 MHS to standby mode
04/06/201315:32:00 The space view counts for MHS Channel H5 dropped to the Lower Deadband range (5%) which triggered a DC Offset
04/06/201315:32:00CHANNEL H5Automatic DC Offset occurred; Correction of 2 counts, radiometrics increased by ~3,000
11/29/201215:40:09CHANNEL H5Reset the gain to 0dB
11/29/201215:38:19H5 LOSwap MHS H5 oscillator to side b
09/04/201216:21:20CHANNEL H5Increased the gain on MHS Channel H5 to 2 dB in order to improve the channel signal.
06/19/201213:25:00CHANNEL H5MHS Channel H5 Dynamic Range periodically began dropping below the 50% threshold warning level.
12/15/201115:42:39CHANNEL H5Increased the H5 Gain from 0dB to 1dB
12/03/201114:30:00CHANNEL H5MHS Channel H5 Dynamic Range periodically began dropping below the 50% threshold warning level.
10/19/201119:04:50CHANNEL H4MHS H4 Gain to 3 dB
10/19/201119:03:14CHANNEL H3MHS H3 Gain to 2 dB
10/19/201117:42:55 MHS to Scan Mode
10/19/201117:40:53 MHS to Standby Mode
10/19/201117:39:46 MHS to Warm Up Mode
10/19/201117:38:58SPEMHS SPE/SCE Turn On
10/19/201117:38:07 MHS to Power On Mode
10/19/201114:20:44 Dump MHS Memory Tables
10/19/201112:39:00 MHS Tripped into Fault Mode (Telemetry Reference Clock Error) during the MIMU RGYRO Test
10/19/201112:36:17 MHS to Standby Mode
10/18/201119:20:46 dump compare validated software adjustment
10/18/201119:20:33 MHS into Scan Mode
10/18/201119:17:28 Dumped the 4 MHS Software Tables
10/18/201119:16:54 adjust the MHS Standby Mode RDM and FDM Warn and Fault Limits (from 0.6 A to 1.24 A)
10/18/201119:16:09 MHS into Standby Mode
07/28/201122:25:56RDMRecover the MHS from Spin State
07/28/201121:47:11RDMN18 MHS Entered Spin State
07/20/201113:53:20 MHS to Scan Mode
07/20/201113:52:57 MHS MEC Dump
07/20/201113:50:51 MHS to Standby Mode
04/16/201118:56:53 MHS to Scan Mode (data outage 18:54:53-18:57:09)
04/16/201118:55:05 MHS to Standby Mode
04/16/201115:55:52 MHS Machine Error Count (MEC) Dump - Diagnostic request from EUMETSAT
12/02/201023:01:00RDMN18 MHS Recovered to Scan Mode
12/02/201020:00:16RDMN18 MHS Entered Spin State - Science Data Invalid
08/19/201018:25:11CHANNEL H4MHS H4 Gain to 3 dB
08/19/201018:22:54CHANNEL H3MHS H3 Gain to 2 dB
08/19/201018:21:42 MHS to Scan Mode
08/19/201018:19:45 MHS Machine Error Count Dump
08/19/201016:48:40 MHS to Standby Mode
08/19/201016:47:22 MHS to Warm Up Mode
08/19/201016:46:35SPEMHS SPE/SCE Turn On
08/19/201016:43:34 MHS to Power On Mode
08/19/201013:23:05 MHS Flight Software Table Dump
08/17/201020:23:53 The MHS tripped into Fault Mode during the N18 MIMU Reduced Gyro Test #2.
08/17/201018:34:45 MHS to Standby Mode for Test 2 - Gyroless mode using MIMU2
03/12/201016:34:00RDMN18 MHS Recovered to Scan Mode
03/12/201014:25:04RDMN18 MHS Entered Spin State - Science Data invalid
07/11/200918:50:29CHANNEL H4MHS Channel H4 DC Offset Automatic Correction of +6 counts; radiometrics shift downward approximately 10,000 counts.
06/07/200920:05:00 MHS Spin State Recovery
06/07/200918:47:00 MHS entered spin state.
05/18/200913:45:45CHANNEL H4Set Channel 4 gain to 3db, results in greater use of the detector's dynamic range.
05/18/200913:43:39CHANNEL H3Set Channel H3 gain to 2db, results in greater use of the detector's dynamic range.
04/20/200918:23:00 MHS to Power On Mode
04/19/200918:44:40 NOAA-18 MHS Instrument entered Spin State as detected during a real-time pass. The recovery sequence was started. During the sequence immediately after receiving the command to transition to Standby Mode, the MHS tripped into Fault Mode.
09/05/200814:49:24DC CONVTRMHS Automatic DC Offset Adjustment enabled.
05/09/200807:06:00 Recover MHS from Spin State which began at 2008/130/05:43:32z.
05/09/200805:43:32 MHS entered Spin State
03/24/200808:22:00CHANNEL H3DC Offset Automatic Adjustment disabled.+8 count adjustment to DCO.
03/24/200808:22:00CHANNEL H4DC Offset Automatic Adjustment disabled.+8 count adjustment to DCO.
03/24/200806:39:07CHANNEL H3DC Offset Automatic Adjustment enabled. Brought radiometric values back into nominal range. DCO value adjusted by +8 counts.
03/24/2008CHANNEL H3DC Offset Automatic Adjustment disabled. +8 count adjustment to DCO.
03/06/200811:23:00 MHS Enter Spin State at 10:30z, recovered at 11:29z
01/17/200806:30:00 Recovery of MHS
01/17/200803:30:00 MHS entered Spin State at 03:30z, recovered at 06:30z
10/31/200720:01:00CHANNEL H4H4 DC Offset 88 (from 93)
10/02/200716:22:00CHANNEL H3MHS DAC Offsets initialization deactivated
10/02/200716:22:00CHANNEL H4MHS DAC Offsets initialization deactivated
10/02/200714:55:00CHANNEL H4Initialize MHS DAC Offsets
10/02/200714:55:00CHANNEL H3Initialize MHS DAC Offsets
09/14/200721:20:00CHANNEL H3DC Offset Initialize deactivated. Selected value for H3 DC Offset x5B(+7 from previous value)
09/14/200721:20:00CHANNEL H4DC Offset Initialize deactivated. Selected value for H4 DC Offset x5D (+7 from previous value)
09/14/200716:18:00CHANNEL H3DC Offset Initialize activated.
09/14/200716:18:00CHANNEL H4DC Offset Initialize activated.
09/05/200716:14:00CHANNEL H3Set MHS H3 Gain to 2db
09/05/200716:14:00CHANNEL H4Set MHS H4 Gain to 3db
09/05/200716:14:00DC CONVTRInitialize MHS DAC Offsets. H3 DCO was x46 is now x54. H4 DCO was x47 is now x56
08/13/2007 The radiometric counts have drifted over time, requiring adjustment. EUMETSAT has been notified. Awaiting their response.
03/27/200702:34:00 The N18 MHS entered motor spin state at 02:34z on day 086. The AET on duty detected this during the subsequent pass at 03:43z and contacted engineering. During the next pass the AET sent CP MHSPINRC to recover the instrument as instructed by the engineer via telephone. The instrument was restored to nominal operations at 086/05:44z.
03/27/200702:34:00 MHS to standby mode, then to scan mode.
03/09/200722:00:00 On March 9, 2007 (07/068) at 22:00z, NOAA18 MHS Channels 3 and 4 DAC Offset Errors. Afterwards on March 11, 2007 (07/070) at 11:10z, the errors cleared themsevles.
07/08/200618:00:00FDMMHS Flywheel motor current started to rise on 8 Jul at approx 14:00z then surged to an all time high of 1110 mA at 18:00z before returning back to lower (but still slightly elevated over historical norms) values. Presently not considered a payload health or mission threat.
06/23/200612:00:00FDMMHS Flywheel motor current started to rise on 23 June then surged to an all time high of 1080 mA (vs. typical 850) on 25 June before returning back to lower (but still slightly elevated over historical norms) values.
01/12/200612:00:00 MHS turbo modes caused by single event upsets because of excess charged particles exposure while over South Atlantic Anomaly. Nominal recovery, no permanent impacts to mission or payload.
01/06/200617:30:00 MHS experienced spin state (turbo) mode for the second time in less than a month. Multiple limit violations and miscompares. Contingency commanding was executed as per MHS Monitoring Guidelines and all flags cleared.
12/16/200505:12:20 MHS experienced spin state (turbo) mode. Multiple limit violations and miscompares. CP MHSPINRC was executed as per MHS Monitoring Guidelines and all flags cleared.
07/29/200512:00:00 MHS 1 pixel along-track pointing error detected. TOAR 452 submitted and closed. Caused by the interpretation of acquisition time in MIU being incorrect by 8/3 of a second. Payload health and data nominal.
06/03/200521:15:00 MHS configure scan profile 0 and load survival heat macro load. MHS OV complete, payload operational.
05/30/200523:30:00 MHS testing and reconfigurations. Command to Safe mode, reconfigure motor current gains, dump science bus tables, return to scan profile.
05/30/200521:50:00 MHS to profile 1
05/30/200520:00:00 Fixed View one pixel step test (cont)
05/30/200518:15:00 Fixed View 1 pixel step test.
05/30/200516:50:00 MHS testing of standby and fix’d mode.
05/29/200520:20:00 MHS Fixed View testing continued through 30 May at 01:25 after which MHS commanded to Scan Mode.
05/26/200517:25:00 Initialize MHS DACS offsets
05/26/200517:20:00CHANNEL H3MHS H3 Gain to 1 dB
05/26/200514:15:30 MHS to scan mode (from standby). First MHS images received and processed at SOCC
05/26/200514:14:15H5 LOOperational, A-side selected
05/26/200514:14:10H3-H4 LOOperational, A-side selected
05/26/200514:14:05H2 LOOperational, A-side selected
05/26/200514:14:00H1 LOOperational, A-side selected
05/26/200514:13:59CHANNEL H5Powered on, operational
05/26/200514:13:55CHANNEL H4Powered on, operational
05/26/200514:13:50CHANNEL H3Powered on, operational
05/26/200514:13:40CHANNEL H2Powered on, operational
05/26/200514:13:36CHANNEL H1Powered on, operational
05/26/200514:13:35FDM MTR SENSORPowered on, operational, A-side selected
05/26/200514:13:31FDM ZPSoperational, A-side selected
05/26/200514:13:30FDMPowered on, operational
05/26/200514:13:20RDM ZPSoperational, A side selected
05/26/200514:13:15RDM MTR SENSORPowered on, operational, A-side selected
05/26/200514:13:00RDMPowered on, operational
05/26/200514:12:50DC CONVTRPowered on, operational
05/25/200517:33:00SPESignal Processing Electronics powered on.
05/25/200517:32:00SCEScan Control Electronics powered on.
05/25/200517:31:00PIEMHS turnon, PIE-A
05/20/200511:59:00 MHS survival heater turned on nominally instrument no yet powered on.