NOAA Office of Satellite and Product Operations

NOAA 18 MHS Subsystem Summary

Component Description Status
CHANNEL H1 Channel H1 (89.0 GHz) Green
CHANNEL H2 Channel H2 (157.0 GHz) Green
CHANNEL H3 Channel H3 (183.3 GHz) Green
CHANNEL H4 Channel H4 (183.3 GHz) Green
CHANNEL H5 Channel H5 (190.3 GHz) Green
DC CONVTR DC/DC Converter Green
FDM Flywheel Driver Motor Green
FDM MTR SENSOR Flywheel Drive Motor Sensor Green
FDM ZPS Flywheel Driver Motor Zero Position Sensor Green
H1 LO H1 Local Oscillator Green
H2 LO H2 Local Oscillator Green
H3-H4 LO H3/H4 Local Oscillator Green
H5 LO H5 Local Oscillator Green
PIE Processor/Interface Electronics Green
RDM Reflector Drive Motor Green
RDM MTR SENSOR Reflector Drive Motor Sensor Green
RDM ZPS Reflector Drive Motor Zero Position Sensor Green
SCE Scan Control Electronics Green
SPE Signal Processing Electronics Green

Subsystem History:

Date Time Component Description
12/15/2015 15:15 CHANNEL H3 Channel H3 experienced a DC Offset
09/23/2015 11:20:00 CHANNEL H4 5 count DC offset experienced by Channel H4
09/16/2015 23:42:59 CHANNEL H1 3 count DC offset experienced by Channel H1
09/15/2015 00:07:09 CHANNEL H3 5 count DC offset experienced by Channel H3
08/27/2015 22:27:25 CHANNEL H3 7 count DC offset experienced by Channel H3
08/22/2015 23:34:00 CHANNEL H4 7 count DC offset experienced by Channel H4
04/27/2015 4:41 CHANNEL H4 7 count DC offset experienced by Channel H4
04/22/2015 5:35 CHANNEL H5 Two count DC Offset experienced
04/4/2015 5:11 CHANNEL H3 Automatic DC Offset of 4 counts; more noticeable in space position and blackbody counts for Channel H3
02/20/2015 9:30 CHANNEL H3 Blackbody 2 reached the top 95% of counts causing an automatic DC offset. Instrument nominal.
02/18/2015 15:50 RDM RDM current increased slightly causing the current profile to increase about 40mA
02/13/2015 2:00 RDM Average current profile increased from around 760mA to 850mA for the RDM.
02/13/2015 9:39 FDM FDM current increased to a maximum value of 1070mA and continues to have a noisier current value with more values reaching 1000mA.
01/01/2015 00:00 FDM NOAA-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.
11/27/2014 16:10 CHANNEL H3 Channel H3 experienced a DC offset, SP3 hit the 5% lower deadband
11/09/2014 6:10 CHANNEL H3 Channel H3 experienced a DC offset, SP1 hit the 5% lower deadband
10/19/2014 23:08 CHANNEL H3 N18 MHS Channel H3 experienced a DC offset, BB1 hit the 95% upper deadband
10/18/2014 23:26 CHANNEL H5 BlackBody and Space Position counts experienced a slight drop in counts, radiometrics decreased slightly for about 4 minutes before returning back to expected behavior
09/21/2014 23:31 CHANNEL H3 MHS Channel H3 experienced a DC offset, BB1 hit the 95% upper deadband
07/16/2014 9:00 FDM FDM current had an overall increase seen in its behavior, reaching a mA value in the mid 1000s daily
01/4/2014 20:00:41 CHANNEL H5 Automatic DC Offset occured; Correction of 2 counts, radiometrics increased by ~3,000
09/24/2013 18:00 RDM Reflector Motor had a brief current surge. All other values appear nominal
08/2/2013 11:46 CHANNEL H2 Channel 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
08/2/2013 11:46 CHANNEL H1 Channel 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
07/24/2013 17:11:28   Place the MHS into Scan Mode
07/24/2013 17:09:05   Dump all of the MHS Tables
07/24/2013 17:08:14   Adjust the MHS TL87, TL88, TL90, TL91
07/24/2013 17:06:05   Place MHS into Standby Mode
07/01/2013 19:34:57   MHS to scan mode
07/01/2013 19:34:01   Dumped the limits table
07/01/2013 19:31:25   MHS to standby mode
04/06/2013 15:32:00   The space view counts for MHS Channel H5 dropped to the Lower Deadband range (5%) which triggered a DC Offset
04/06/2013 15:32:00 CHANNEL H5 Automatic DC Offset occurred; Correction of 2 counts, radiometrics increased by ~3,000
11/29/2012 15:40:09 CHANNEL H5 Reset the gain to 0dB
11/29/2012 15:38:19 H5 LO Swap MHS H5 oscillator to side b
09/04/2012 16:21:20 CHANNEL H5 Increased the gain on MHS Channel H5 to 2 dB in order to improve the channel signal.
06/19/2012 13:25:00 CHANNEL H5 MHS Channel H5 Dynamic Range periodically began dropping below the 50% threshold warning level.
12/15/2011 15:42:39 CHANNEL H5 Increased the H5 Gain from 0dB to 1dB
12/03/2011 14:30:00 CHANNEL H5 MHS Channel H5 Dynamic Range periodically began dropping below the 50% threshold warning level.
10/19/2011 19:04:50 CHANNEL H4 MHS H4 Gain to 3 dB
10/19/2011 19:03:14 CHANNEL H3 MHS H3 Gain to 2 dB
10/19/2011 17:42:55   MHS to Scan Mode
10/19/2011 17:40:53   MHS to Standby Mode
10/19/2011 17:39:46   MHS to Warm Up Mode
10/19/2011 17:38:58 SPE MHS SPE/SCE Turn On
10/19/2011 17:38:07   MHS to Power On Mode
10/19/2011 14:20:44   Dump MHS Memory Tables
10/19/2011 12:39:00   MHS Tripped into Fault Mode (Telemetry Reference Clock Error) during the MIMU RGYRO Test
10/19/2011 12:36:17   MHS to Standby Mode
10/18/2011 19:20:46   dump compare validated software adjustment
10/18/2011 19:20:33   MHS into Scan Mode
10/18/2011 19:17:28   Dumped the 4 MHS Software Tables
10/18/2011 19:16:54   adjust the MHS Standby Mode RDM and FDM Warn and Fault Limits (from 0.6 A to 1.24 A)
10/18/2011 19:16:09   MHS into Standby Mode
07/28/2011 22:25:56 RDM Recover the MHS from Spin State
07/28/2011 21:47:11 RDM N18 MHS Entered Spin State
07/20/2011 13:53:20   MHS to Scan Mode
07/20/2011 13:52:57   MHS MEC Dump
07/20/2011 13:50:51   MHS to Standby Mode
04/16/2011 18:56:53   MHS to Scan Mode (data outage 18:54:53-18:57:09)
04/16/2011 18:55:05   MHS to Standby Mode
04/16/2011 15:55:52   MHS Machine Error Count (MEC) Dump - Diagnostic request from EUMETSAT
12/02/2010 23:01:00 RDM N18 MHS Recovered to Scan Mode
12/02/2010 20:00:16 RDM N18 MHS Entered Spin State - Science Data Invalid
08/19/2010 18:25:11 CHANNEL H4 MHS H4 Gain to 3 dB
08/19/2010 18:22:54 CHANNEL H3 MHS H3 Gain to 2 dB
08/19/2010 18:21:42   MHS to Scan Mode
08/19/2010 18:19:45   MHS Machine Error Count Dump
08/19/2010 16:48:40   MHS to Standby Mode
08/19/2010 16:47:22   MHS to Warm Up Mode
08/19/2010 16:46:35 SPE MHS SPE/SCE Turn On
08/19/2010 16:43:34   MHS to Power On Mode
08/19/2010 13:23:05   MHS Flight Software Table Dump
08/17/2010 20:23:53   The MHS tripped into Fault Mode during the N18 MIMU Reduced Gyro Test #2.
08/17/2010 18:34:45   MHS to Standby Mode for Test 2 - Gyroless mode using MIMU2
03/12/2010 16:34:00 RDM N18 MHS Recovered to Scan Mode
03/12/2010 14:25:04 RDM N18 MHS Entered Spin State - Science Data invalid
07/11/2009 18:50:29 CHANNEL H4 MHS Channel H4 DC Offset Automatic Correction of +6 counts; radiometrics shift downward approximately 10,000 counts.
06/07/2009 20:05:00   MHS Spin State Recovery
06/07/2009 18:47:00   MHS entered spin state.
05/18/2009 13:45:45 CHANNEL H4 Set Channel 4 gain to 3db, results in greater use of the detector's dynamic range.
05/18/2009 13:43:39 CHANNEL H3 Set Channel H3 gain to 2db, results in greater use of the detector's dynamic range.
04/20/2009 18:23:00   MHS to Power On Mode
04/19/2009 18:44:40   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.
09/05/2008 14:49:24 DC CONVTR MHS Automatic DC Offset Adjustment enabled.
05/09/2008 07:06:00   Recover MHS from Spin State which began at 2008/130/05:43:32z.
05/09/2008 05:43:32   MHS entered Spin State
03/24/2008 08:22:00 CHANNEL H4 DC Offset Automatic Adjustment disabled. +8 count adjustment to DCO.
03/24/2008 08:22:00 CHANNEL H3 DC Offset Automatic Adjustment disabled. +8 count adjustment to DCO.
03/24/2008 06:39:07 CHANNEL H3 DC Offset Automatic Adjustment enabled. Brought radiometric values back into nominal range. DCO value adjusted by +8 counts.
03/24/2008 00:00:00 CHANNEL H3 DC Offset Automatic Adjustment disabled. +8 count adjustment to DCO.
03/06/2008 11:23:00   MHS Enter Spin State at 10:30z, recovered at 11:29z
01/17/2008 06:30:00   Recovery of MHS
01/17/2008 03:30:00   MHS entered Spin State at 03:30z, recovered at 06:30z
10/31/2007 20:01:00 CHANNEL H4 H4 DC Offset 88 (from 93)
10/02/2007 16:22:00 CHANNEL H4 MHS DAC Offsets initialization deactivated
10/02/2007 16:22:00 CHANNEL H3 MHS DAC Offsets initialization deactivated
10/02/2007 14:55:00 CHANNEL H3 Initialize MHS DAC Offsets
10/02/2007 14:55:00 CHANNEL H4 Initialize MHS DAC Offsets
09/14/2007 21:20:00 CHANNEL H4 DC Offset Initialize deactivated. Selected value for H4 DC Offset x5D (+7 from previous value)
09/14/2007 21:20:00 CHANNEL H3 DC Offset Initialize deactivated. Selected value for H3 DC Offset x5B (+7 from previous value)
09/14/2007 16:18:00 CHANNEL H4 DC Offset Initialize activated.
09/14/2007 16:18:00 CHANNEL H3 DC Offset Initialize activated.
09/05/2007 16:14:00 CHANNEL H3 Set MHS H3 Gain to 2db
09/05/2007 16:14:00 DC CONVTR Initialize MHS DAC Offsets H3 DCO was x46 is now x54 H4 DCO was x47 is now x56
09/05/2007 16:14:00 CHANNEL H4 Set MHS H4 Gain to 3db
08/13/2007 00:00:00   The radiometric counts have drifted over time, requiring adjustment. EUMETSAT has been notified. Awaiting their response.
03/27/2007 02:34:00   MHS to standby mode, then to scan mode.
03/27/2007 02:34:00   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.
03/09/2007 22:00:00   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.
12/21/2006 20:29:00   MHS to SCAN MODE
12/21/2006 20:24:00   Load new DC offset settings
12/21/2006 20:22:00   MHS to STANDBY MODE
07/08/2006 18:00:00 FDM MHS 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.
06/23/2006 12:00:00 FDM MHS 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.
01/12/2006 12:00:00   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.
01/06/2006 17:30:00   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.
12/16/2005 05:12:20   MHS experienced spin state (turbo) mode. Multiple limit violations and miscompares. CP MHSPINRC was executed as per MHS Monitoring Guidelines and all flags cleared.
07/29/2005 12:00:00   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.
06/03/2005 21:15:00   MHS configure scan profile 0 and load survival heat macro load. MHS OV complete, payload operational.
05/30/2005 23:30:00   MHS testing and reconfigurations. Command to Safe mode, reconfigure motor current gains, dump science bus tables, return to scan profile.
05/30/2005 21:50:00   MHS to profile 1
05/30/2005 20:00:00   Fixed View one pixel step test (cont)
05/30/2005 18:15:00   Fixed View 1 pixel step test.
05/30/2005 16:50:00   MHS testing of standby and fixÆd mode.
05/29/2005 20:20:00   MHS Fixed View testing continued through 30 May at 01:25 after which MHS commanded to Scan Mode.
05/26/2005 17:25:00   Initialize MHS DACS offsets
05/26/2005 17:20:00 CHANNEL H3 MHS H3 Gain to 1 dB
05/26/2005 14:15:30   MHS to scan mode (from standby). First MHS images received and processed at SOCC
05/26/2005 14:14:15 H5 LO Operational, A-side selected
05/26/2005 14:14:10 H3-H4 LO Operational, A-side selected
05/26/2005 14:14:05 H2 LO Operational, A-side selected
05/26/2005 14:14:00 H1 LO Operational, A-side selected
05/26/2005 14:13:59 CHANNEL H5 Powered on, operational
05/26/2005 14:13:55 CHANNEL H4 Powered on, operational
05/26/2005 14:13:50 CHANNEL H3 Powered on, operational
05/26/2005 14:13:40 CHANNEL H2 Powered on, operational
05/26/2005 14:13:36 CHANNEL H1 Powered on, operational
05/26/2005 14:13:35 FDM MTR SENSOR Powered on, operational, A-side selected
05/26/2005 14:13:31 FDM ZPS operational, A-side selected
05/26/2005 14:13:30 FDM Powered on, operational
05/26/2005 14:13:20 RDM ZPS operational, A side selected
05/26/2005 14:13:15 RDM MTR SENSOR Powered on, operational, A-side selected
05/26/2005 14:13:00 RDM Powered on, operational
05/26/2005 14:12:50 DC CONVTR Powered on, operational
05/25/2005 17:33:00 SPE Signal Processing Electronics powered on.
05/25/2005 17:32:00 SCE Scan Control Electronics powered on.
05/25/2005 17:31:00 PIE MHS turnon, PIE-A
05/20/2005 11:59:00   MHS survival heater turned on nominally instrument no yet powered on.