CEPPAD/CAMMICE/RAPID

CEPPAD Operations

The following are e-mail messages regarding the operation of the CEPPAD instrument.
Most recent messages are at the top. Older messages are down below.

Date: Thu, 20 Feb 1997 11:35:28 -0800
From: "Dan Mabry"
Subject: CEPPAD Changes
To: "CEPPAD"

Dear All,

Jim Sullivan just recently extracted the IPS calibration data from the
LZ data stream and I have just done a preliminary comparison with previous
calibration data sets. We had established a good deal of preflight data,
as well as the initial on-orbit performance (2/28/96) and the launch plus
thirty days performance (4/1/96). We also have watched the system
performance with time in a more subjective way just by daily eyeballing. I
am happy to report that the system gains have remained very stable
according to our latest calibration run (2/25/97). There appears to be no
gain shifts larger than the statistical uncertainties inherent to our auto
calibration procedure and thus the advertised energy levels are right on
target.

For those not in the know, our most sensitive parts in the IPS
instrument were the KM5 chips which exhibited a response to radiation that
we established in the lab. Given this known response, we redesigned most
of the effects out and then put in additional "fixes" to the residual
effects. The biggest effects seen in the lab occurred under the initial
few 10's of kRad dose, reached early in the mission. We appear to have
successfully navigated the most difficult IPS waters. As I delve deeper
into the calibration data, I will let you know if there are some hidden
surprises, but I don't expect the need for a follow up on this good news.

Given that we just passed the one year anniversary of POLAR, I would like
to take pause and thank the team for all aspects of the mission thus far.
The flurry of good science coming out of the IPS (and other) instrument(s)
was built on a solid five years of good engineering. As such it is
important to reiterate the credit to those who toiled to make all this
possible. Much thanks should be given especially to Jon Osborn, Dan Mabry,
Al Kolasinski, Joe Fennell, Bern Blake and the rest of the Aerospace team
for identifying and surgically removing the warts that appeared during the
IPS development phase. Its a baby that we can now all be proud of!

Cheers, - Harlan

Date: Fri, 28 Feb 1997 10:29:04 -0800
From: "Dan Mabry"
Subject: CEPPAD Operations

On day 56 of 1997 (2/25), the CEPPAD system was switched out of normal science
mode to allow for calibration of the IPS and IES sensors. The automated IPS
autocalibration was executed between 20:00:00 and 22:00:00 with a complete
data dump of the results (in byte 15 area) between 22:00:00 and 22:07:00.

The science telemetry area was used during the calibration exercise for output
of IES pedestal data. The DPU was commanded to output each IES ID in full
histogram mode for 16 spins at each ID. The command state of the instrument
was permuted every 15 minutes to give a full dataset of IES pedestal locations
and FWHMs for all time constant vs. large/small settings. Mode changes were
as follows:

20:02:00 2 usec small
20:17:00 2 usec large
20:32:00 10 usec small
20:47:00 10 usec large
21:02:00 50 usec small
21:17:00 50 usec large
21:32:00 100 usec small
21:47:00 100 usec large

At 22:07:30, normal science operations were continued as they were before the
calibration operations.

Martin Carter and Harlan Spence, please review the calibration data for IES
and IPS, respectively and let us know how things look.

Regards, Dan Mabry

Date: Thu, 20 Feb 1997 11:35:28 -0800
From: "Dan Mabry"
Subject: CEPPAD Changes
To: "CEPPAD"

On Wednesday 2/19/97 (day 97:050) at UT 19:19:25, the CEPPAD system was
switched to fixed telemetry mode for software maintenance. The software was
changed so that the autoswitch of IES mode from 2 usec small detector back to
2 usec large detector happens later than previously done.

As you may know, autoswitching of the IES is based on the integral value for
look direction 1. The maximum integral value is located for 32 sectors; this
value is called the maximum sector integral. When 16 maximum sector integrals
of 16 are below the threshold, then switch from 2 usec small to 2 usec large
occurs.

The previous threshold value was 36 and has been lowered to 18.

Normal science operations for CEPPAD were resumed at UT 19:21:53.

Regards, Dan Mabry

Date: Mon, 27 Jan 1997 16:58:34 -0800
From: "Dan Mabry" <dan_mabry@qmail2.aero.org>
Subject: Config. Changes to CEPPAD
To: "CEPPAD" <ceppad-team@lanl.gov>
Precedence: bulk
Sender: ceppad-team-request@nis.lanl.gov

Subject: Time: 4:45 PM
OFFICE MEMO Config. Changes to CEPPAD Date: 1/27/97

On day 97/024 (1/24/97) at UT 19:24:25, the CEPPAD system was taken out of
science gathering mode for table modifications. Normal science operations
were continued at 97/024:19:31:03.

Operations performed were as follows:

19:24:25 - switch to fixed telemetry mode to allow science table modification

19:25:08 - select the HIST singles-only mode for byte 15 output. Until this
time, the byte 15 output had been toggling between singles output and direct
events.

19:25:48 - load new HIST lookup table 0 (HISTLUT0, ABC mode) to use the Jim
Sullivan table recommendations of 10/30/96.

19:27:00 - load new HIST lookup table 1 (HISTLUT1, Half BC mode) to use the
Jim Sullivan table recommendations of 10/30/96 with the following exception:
ID #6 remains as for previous Half BC table. Breakpoints for bins
in energy space are: 0, 0, 0, 0, 0, 0, 0, 0, 2, 14, 30, 50, 75, 107, 148,
200, 255.

19:28:16 - HIST auto-switching thresholds were modified to provide the
following algorithm:

Nominal mode = ABC
if A1 single > 300K counts at 16-spin boundary, then switch to
Half BC mode for 16 spins

This algorithm has two stable modes: ABC only and ABC/HBC toggle.
Toggle occurs if rate in ABC mode for A1 single is greater than 300K
counts.

19:29:27 - Mode Switching Table #11 (MST11) modified to utilize HISTLUT0,
HISTLUT1, and HIST Limits identified above.

19:31:03 - Mode Switching Table #11 activated - normal science operations
continue.

Best regards,
Dan Mabry

Date: Wed, 9 Oct 1996 15:27:37 -0700
From: "Patricia Lew" <patricia_lew@qmail2.aero.org>
Subject: Re: Maneuver planning for second spacecraft flip
To: "John Wainwright, WIND/POLAR FO" <WAINWRIGHT@ISTP1.GSFC.NASA.GOV>,
"Cammice Team" <cammice-team@lanl.gov>
Precedence: bulk
Sender: cammice-team-request@nis.lanl.gov

RE>Maneuver planning 10/09/96

John,
The following two .RTC files (one pre-maneuver and one post-maneuver) contains
the Cammice requirements for the second 180 degree spacecraft flip. The
procedures should be at the POCC by the time you get this message.

Execute MICPRE180_2.RTC sometime on day 290. This procedure will be run
non-interactively.
START PIMICHVRAMPDWN ; ramp down the MICS HV, done during first
flip
START PIMICDPUOFF ; completely turn off the MICS instrument
START PIHITXON ; turn on HIT cross mode

Execute MICPOST180_2.RTC sometime on day 293. This procedure will be run
interactively with Stefano Livi at the POCC.
Turn off HIT cross mode
START PIMICDPUON ; Turn on the MICS DPU and ramp up the
HV
Turn off the ESA ; Just to be on the safe side
Upload a new full range stepping sequence
; [14,12,10,08,06,04,02,00,01,03,05,07,09,11,13,15,
; 16,17,19,21,23,25,27,29,28,26,24,22,20,18,16,15]
Turn on ESA full range stepping

If you have any questions let me know.
Patty Lew

--------------------------------------
Date: 10/09/96 09:28
To: Patricia Lew
From: John Wainwright, WIND/POLAR FO
The schedule for the flip maneuver is as follows:

Segment 1: Start 291:16:00:00 Sun angle = 93.22 deg.
End 291:20:03:11 Sun angle = 90.51 deg.

Segment 2: Start 292:01:22:00 Sun angle = 90.64 deg.
End 292:04:37:56 Sun angle = 89:01 deg.

Trim maneuvers will follow, as required.
The spin axis precession is to negative orbit normal.

Would you please send in your commanding requirements
(RTCs, RQLs) for the pre- and post-maneuver periods.
There should be no instrument commands executing from
the stored tables during the maneuver periods.

Date: Thu, 15 Aug 1996 15:27:07 -0700
From: "Dan Mabry" <dan_mabry@qmail2.aero.org>
Subject: Change to CEPPAD Config.
To: "CEPPAD" <ceppad-team@lanl.gov>
X-Attachments: "Ceppad Cmd Summary" (type: uuencode-datafork)
Precedence: bulk
Sender: ceppad-team-request@nis.lanl.gov

Subject: Time: 1:48 PM
OFFICE MEMO Change to CEPPAD Config. Date: 8/15/96

CEPPAD team,

On day 225 (8/12/96), the CEPPAD system was put into fixed telemetry mode
for 6 minutes for table maintenance. Table modifications were performed on
all HIST tables to change the commandwords from 3F00 to 3700 (ABC mode), 3F01
to 3701 (HBC mode), and 3F11 to 3711 (BC mode). All energy breakpoint values
remain the same. The telemetry system was returned to normal science mode at
225:03:07:31.

Also on day 225 (8/12/96), calibration operations on both the IPS and HIST
were performed. The IPS autocalibration was started at 225:18:00:10 on all 15
channels. A dump of the autocalibration report was output in every major
frame between 225:20:00:10 and 225:20:05:10.
During the period between 225:18:29:50 and 225:20:05:20 the telemetry stream
is formatted for passage of HIST histogram data for the Cal C channel.
Commandwords for the HIST are changed to step the high voltage setting
starting at 225:18:30:00 and changed every 5 minutes thereafter. Normal
science mode telemetry output is resumed at 225:20:05:20.

On day 228 (8/15/96) the active mode switching table (MST) #11 was
modified to cause a forced switch of the HIST commandword on every 16 spin
boundary. The two modes involved in the toggle are the ABC and BC modes.
Half BC mode and autoswitching for the HIST are no longer enabled. At
228:11:53:43, the DPU was switched to fixed telemetry mode for table
maintenance; at 228:11:55:23 the new table was activated and science mode
telemetry was again output.

For your convenience, I have attached a list of all CEPPAD command
activity from launch to 8/15/96. The file is formatted for Excel 5.0 on the
Macintosh platform.

Regards, Dan Mabry

Date: Fri, 16 Aug 1996 11:40:01 -0700

I have heard back from you that my previous submission of the CEPPAD
command log from launch through 8/15/96 was not readable in many cases. Below
I am providing the same table as text.

Time Command Description
1996:057:15:57:05 I_CEP_MAJ SCI Ceppad to Science Mode
1996:057:16:29:28 I_CEP_MAJ MAN Ceppad to Maneuver Mode
1996:059:13:59:12 Initial checkout start Ceppad DPU On
1996:060:15:20:13 Initial checkout end
1996:064:02:59:47 I_CEP_MAJ SCI Ceppad to Science Mode
1996:064:03:25:24 I_CEP_MAJ MAN Ceppad to Maneuver Mode
1996:069:21:22:31 I_CEP_MIN TLMSTMSET X:FF X:C4 Select HIST histogram
telemetry output
1996:069:21:22:40 I_CEP_MIN HSTCMDSET X:3B02 X:E7 Set HIST command word to
X'3B02' to activate the calibrator
1996:069:21:22:44 I_CEP_MIN HSTLUTSET X:1C X:CA Select output of HIST Cal C
data
1996:069:21:23:07 I_CEP_MIN HSTCMDSET X:3302 X:DF Change HIST command word to
X'3302'
1996:069:21:23:16 I_CEP_MIN HSTCMDSET X:3B02 X:E7 Change HIST command word to
X'3B02'
1996:069:21:23:27 I_CEP_MIN HSTCMDSET X:4302 X:EF Change HIST command word to
X'4302'
1996:069:21:23:48 I_CEP_MIN HSTCMDSET X:4B02 X:F7 Change HIST command word to
X'4B02'
1996:069:21:23:56 I_CEP_MIN HSTCMDSET X:5302 X:FF Change HIST command word to
X'5302'
1996:069:21:24:03 I_CEP_MIN HSTCMDSET X:5B02 X:07 Change HIST command word to
X'5B02'
1996:069:21:24:14 I_CEP_MIN HSTCMDSET X:3B02 X:E7 Change HIST command word to
X'3B02'
1996:069:21:24:20 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT6 Load
(096/3/2)
LOAD CEPIES6ZBD0F.MIC
1996:069:21:24:41 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT7 Load
(096/3/2)
LOAD CEPIES7ZE9CE.MIC
1996:069:21:25:00 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT8 Load
(096/3/2)
LOAD CEPIES8Z9582.MIC
1996:069:21:25:16 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for MST8 Load
(096/3/2)
LOAD CEPMST8Z055F.MIC
1996:069:21:25:27 I_CEP_MIN TLMSTMSET X:8 X:CD Activate MST 8 (new science
mode)
1996:069:21:32:15 I_CEP_MIN TLMSTMSET X:FF X:C4 Select HIST histogram
telemetry output
1996:069:21:32:40 I_CEP_MIN HSTCMDSET X:3B02 X:E7 Set HIST command word to
X'3B02' to activate the calibrator
1996:069:21:32:47 I_CEP_MIN HSTLUTSET X:1C X:CA Select output of HIST Cal C
data
1996:069:21:34:59 I_CEP_MIN HSTCMDSET X:3302 X:DF Change HIST command word to
X'3302'
1996:069:21:37:13 I_CEP_MIN HSTCMDSET X:3B02 X:E7 Change HIST command word to
X'3B02'
1996:069:21:39:27 I_CEP_MIN HSTCMDSET X:4302 X:EF Change HIST command word to
X'4302'
1996:069:21:41:41 I_CEP_MIN HSTCMDSET X:4B02 X:F7 Change HIST command word to
X'4B02'
1996:069:21:43:55 I_CEP_MIN HSTCMDSET X:5302 X:FF Change HIST command word to
X'5302'
1996:069:21:46:09 I_CEP_MIN HSTCMDSET X:5B02 X:07 Change HIST command word to
X'5B02'
1996:069:21:48:30 I_CEP_MIN HSTCMDSET X:3B02 X:E7 Change HIST command word to
X'3B02'
1996:069:21:50:36 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT6 Load
(096/3/2)
LOAD CEPIES6ZBD0F.MIC
1996:069:21:51:12 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT7 Load
(096/3/2)
LOAD CEPIES7ZE9CE.MIC
1996:069:21:51:47 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT8 Load
(096/3/2)
LOAD CEPIES8Z9582.MIC
1996:069:21:52:22 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for MST8 Load
(096/3/2)
LOAD CEPMST8Z055F.MIC
1996:069:21:53:00 I_CEP_MIN TLMSTMSET X:8 X:CD Activate MST 8 (new science
mode)
1996:070:14:04:03 I_CEP_MAJ MAN Ceppad to Maneuver Mode
1996:076:09:22:30 I_CEP_MIN TLMSYNCSUN X:C6 Activate sun sync'ed telemetry
operation
1996:076:10:23:28 I_CEP_MIN TLMSYNCSUN X:C6 Activate sun sync'ed telemetry
operation
1996:077:20:55:26 I_CEP_MAJ MAN Ceppad to Maneuver Mode
1996:078:03:08:11 I_CEP_MAJ SCI Ceppad to Science Mode
1996:078:07:03:23 I_CEP_MAJ MAN Ceppad to Maneuver Mode
1996:078:18:54:43 I_CEP_MAJ SCI Ceppad to Science Mode
1996:079:12:23:18 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT0 Load
(096/3/18)
LOAD CEPIES0ZBD0F.MIC
1996:079:12:24:45 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT1 Load
(096/3/18)
LOAD CEPIES1ZE9CE.MIC
1996:079:12:25:58 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT2 Load
(096/3/18)
LOAD CEPIES2Z9582.MIC
1996:079:12:26:58 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for MST9 Load
(096/3/18)
LOAD CEPMST9ZA8FA.MIC
1996:079:12:28:00 I_CEP_MIN TLMSTMSET X:9 X:CE Activate MST 9 (new science
mode)
1996:079:15:31:29 I_CEP_MAJ MAN Ceppad to Maneuver Mode
1996:080:14:29:49 I_CEP_MAJ SCI Ceppad to Science Mode
1996:080:21:25:07 I_CEP_MIN TLMSTMSET X:10 X:D5 Change to fixed telemetry mode

1996:080:21:26:34 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for HISTLUT1 Load
(096/3/20)
LOAD CEPHST1Z8605.MIC
1996:080:21:35:53 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for HISTLUT2 Load
(096/3/20)
LOAD CEPHST2ZF626.MIC
1996:080:21:35:53 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Extra Page Set Command ??

1996:080:21:37:15 I_CEP_MIN TLMSTMSET X:9 X:CE Activate science mode #9
1996:081:00:35:42 I_CEP_MIN TLMSTMSET X:FF X:C4 Select HIST histogram
telemetry output
1996:081:00:36:12 I_CEP_MIN HSTCMDSET X:3B02 X:E7 Set HIST command word to
X'3F02' to activate the calibrator
1996:081:00:36:31 I_CEP_MIN HSTLUTSET X:1C X:CA Select output of HIST Cal C
data
1996:081:00:47:32 I_CEP_MIN TLMSTMSET X:9 X:CE Activate MST 9 for new science
mode
1996:083:14:45:13 I_CEP_MIN TLMSTMSET X:10 X:D5 Change to fixed telemetry mode

1996:083:14:47:55 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for HISTLUT0 Load
(096/3/23)
LOAD CEPHST0Z197F.MIC
1996:083:14:50:17 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for HISTLUT1 Load
(096/3/23)
LOAD CEPHST1Z07CB.MIC
1996:083:14:52:25 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for HISTLUT2 Load
(096/3/23)
LOAD CEPHST2Z77E8.MIC
1996:083:14:53:31 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for HISTLUT3 Load
(096/3/23)
LOAD CEPHST3Z77E8.MIC
1996:083:14:54:27 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for MST10 Load
(096/3/23)
LOAD CEPMSTAZE852.MIC
1996:083:14:55:39 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for IPS sun
blanking table
LOAD CEPIPSBLNK0.MIC
1996:083:14:57:37 I_CEP_MIN TLMSTMSET X:'9' X:'CE' Activate MST #9 science
telemetry
1996:086:22:43:35 I_CEP_MIN TLMSTMSET X:'A' X:'CF' Activate MST #10 science
telemetry
1996:092:11:59:50 I_CEP_MIN IPSQMODDIS X:CC Put the IPS interface into noise
mode
1996:092:12:00:00 I_CEP_MIN IPSCALEN X:7FFF X:12 Start the IPS
autocalibration operation
1996:092:12:29:40 I_CEP_MIN TLMSTMSET X:FF X:C4 Select HIST histogram
telemetry output
1996:092:12:29:50 I_CEP_MIN HSTCMDSET X:3F02 X:EB Set HIST command word to
X'3F02' to activate the calibrator
1996:092:12:30:00 I_CEP_MIN HSTLUTSET X:1C X:CA Select output of HIST Cal C
data
1996:092:13:30:00 I_CEP_MIN TLMSTMSET X:A X:CF Return the DPU to science mode
(MST #10)
1996:092:13:59:50 I_CEP_MIN IPSQMODEN X:CB "IPS autocalibration is complete,
return to quiet mode"
1996:092:14:00:00 I_CEP_MIN TLMNSTMSET X:5 X:C9 Force output of the IPS
autocalibration report for 1 minute
1996:092:14:01:00 I_CEP_MIN TLMNSTMSET X:0 X:C4 Return to HIST singles output
in byte 15
1996:092:22:29:40 I_CEP_MIN TLMSTMSET X:FF X:C4 Select HIST histogram
telemetry output
1996:092:22:29:50 I_CEP_MIN HSTCMDSET X:3F02 X:EB Set HIST command word to
X'3F02' to activate the calibrator
1996:092:22:30:00 I_CEP_MIN HSTLUTSET X:1C X:CA Select output of HIST Cal C
data
1996:092:23:15:00 I_CEP_MIN TLMSTMSET X:A X:CF Return the DPU to science mode
(MST #10)
1996:096:17:22:07 I_CEP_MIN IPSQMODDIS X'CC' Put the IPS interface into noise
mode
1996:096:17:23:03 I_CEP_MIN IPSCALEN X'7FFF' X'12' Start the IPS
autocalibration operation
1996:096:17:23:48 I_CEP_MIN TLMNSTMSET X'5' X'C9' Select output of the IPS Cal
Report in byte 15
1996:096:17:24:37 I_CEP_MIN TLMSTMSET X'7' X'CC' Activate IES look direction
sweep (MST #7)
1996:096:17:25:27 I_CEP_MIN IESCMDSET X'10' X'B0' Select output for 2 usec
small pixels
1996:096:17:45:28 I_CEP_MIN IESCMDSET X'04' X'A4' Select output for 2 usec
large pixels
1996:096:18:17:17 I_CEP_MIN IESCMDSET X'90' X'30' Select output for 10 usec
small pixels
1996:096:18:34:03 I_CEP_MIN IESCMDSET X'84' X'24' Select output for 10 usec
large pixels
1996:096:18:49:28 I_CEP_MIN IESCMDSET X'50' X'F0' Select output for 50 usec
small pixels
1996:096:19:04:35 I_CEP_MIN IESCMDSET X'44' X'E4' Select output for 50 usec
large pixels
1996:096:19:24:20 I_CEP_MIN IESCMDSET X'D0' X'70' Select output for 100 usec
small pixels
1996:096:19:44:15 I_CEP_MIN IESCMDSET X'C4' X'64' Select output for 100 usec
large pixels
1996:096:20:01:28 I_CEP_MIN IPSQMODEN X'CB' "IPS autocalibration is complete,
return to quiet mode"
1996:096:20:02:23 I_CEP_MIN TLMNSTMSET X'0' X'C4' Force NSTM data format back
to HIST singles
1996:096:20:03:07 I_CEP_MIN TLMSTMSET X'A' X'CF' Return the DPU to new science
mode (MST #10)
1996:106:23:40:33 I_CEP_MIN HSTINTFDIS X'AB' Disable the HIST interface
1996:106:23:41:16 I_CEP_MIN HSTPWROFF X'AF' Disable primary power to the HIST
1996:108:16:46:13 I_CEP_MAJ SCI Ceppad to Science Mode
1996:110:15:55:00 I_CEP_MIN TLMSTMSET X:7 X:CC Activate IES look direction
sweep (MST #7)
1996:110:16:00:00 I_CEP_MIN IESCMDSET X:18 X:B8 Select output for 2 usec
small pixels
1996:110:16:15:00 I_CEP_MIN IESCMDSET X:0C X:AC Select output for 2 usec
large pixels
1996:110:16:30:00 I_CEP_MIN IESCMDSET X:98 X:38 Select output for 10 usec
small pixels
1996:110:16:45:00 I_CEP_MIN IESCMDSET X:8C X:2C Select output for 10 usec
large pixels
1996:110:17:00:00 I_CEP_MIN IESCMDSET X:58 X:F8 Select output for 50 usec
small pixels
1996:110:17:15:00 I_CEP_MIN IESCMDSET X:4C X:EC Select output for 50 usec
large pixels
1996:110:17:30:00 I_CEP_MIN IESCMDSET X:D8 X:78 Select output for 100 usec
small pixels
1996:110:17:45:00 I_CEP_MIN IESCMDSET X:CC X:6C Select output for 100 usec
large pixels
1996:110:18:00:00 I_CEP_MIN TLMSTMSET X:A X:CF Return the DPU to science mode
(MST #10)
1996:115:16:08:54 I_CEP_MIN HSTPWRON X'B0' Enable primary power to the HIST
1996:115:16:09:46 I_CEP_MIN HSTINTFEN X'AC' Enable the HIST interface
1996:121:17:52:07 I_CEP_MIN TLMSTMSET X:'10' X:'D5' Change to fixed telemetry
mode
1996:121:17:52:27 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for HIST
autoswitch threshold load
LOAD CEPHSTLIM.MIC
1996:121:17:53:55 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for HISTLUT3 Load
(096/4/30)
LOAD CEPHST3Z197F.MIC
1996:121:17:55:44 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT0 Load
(096/4/30)
LOAD CEPIES0ZD60F.MIC
1996:121:17:57:11 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT1 Load
(096/4/30)
LOAD CEPIES1Z96EF.MIC
1996:121:17:58:36 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for IESLUT2 Load
(096/4/30)
LOAD CEPIES2Z14E5.MIC
1996:121:17:59:54 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for SAT4 Load
(096/4/30)
LOAD CEPSAT4ZA0B3.MIC
1996:121:18:01:46 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for MST11 Load
(096/4/30)
LOAD CEPMSTBZD4C3.MIC
1996:121:18:03:20 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for MST12 Load
(096/4/30)
LOAD CEPMSTCZ946B.MIC
1996:121:18:04:16 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for MST13 Load
(096/4/30)
LOAD CEPMSTDZABF3.MIC
1996:121:18:06:19 I_CEP_MIN TLMSTMSET X:B X:D0 Activate MST #11 (new science
mode)
1996:141:04:03:37 I_CEP_MIN DPUPAGESET X:0 X:BA Page Set for HIST threshold
load
1996:141:04:04:08 LOAD CEPHSTLIM.MIC "(incorrectly reloaded 30K,100K)"
1996:141:18:26:22 I_CEP_MIN DPUPAGESET X:0 X:BA Page Set for HIST threshold
load
1996:141:18:28:11 LOAD CEPHSTLIM.MIC "(correctly loaded 100K,300K)"
1996:158:19:36:22 I_CEP_MIN IESZEROSET I'1240' X'85' Reduce IES/HIST offset
from sun sensor to
78 degrees (was 83 degrees)
1996:158:19:36:32 I_CEP_MIN IPSZEROSET I'887' X'19' Reduce IPS offset from sun
sensor to 109
degrees (was 114 degrees)
1996:185:04:21:40 I_CEP_MIN TLMSTMSET X'10' X'D5' Change to fixed telemetry
for code maintenance
1996:185:04:22:10 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:22:13 LOAD CEP07F7.MIC "Load Patch #7, Segment 7"
1996:185:04:24:08 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:24:11 LOAD CEP07F8.MIC "Load Patch #7, Segment 8"
1996:185:04:25:25 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:25:29 LOAD CEP07F9.MIC "Load Patch #7, Segment 9"
1996:185:04:26:30 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:26:34 LOAD CEP07F10.MIC "Load Patch #7, Segment 10"
1996:185:04:27:40 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:27:43 LOAD CEP07F11.MIC "Load Patch #7, Segment 11"
1996:185:04:29:05 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:29:10 LOAD CEP07F1.MIC "Load Patch #7, Segment 1"
1996:185:04:31:45 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:31:47 LOAD CEP07F6.MIC "Load Patch #7, Segment 6"
1996:185:04:32:40 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:32:44 LOAD CEP07F5.MIC "Load Patch #7, Segment 5"
1996:185:04:33:50 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:33:55 LOAD CEP07F3.MIC "Load Patch #7, Segment 3"
1996:185:04:35:56 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:35:59 LOAD CEP07F4.MIC "Load Patch #7, Segment 4"
1996:185:04:37:30 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:37:36 LOAD CEP07F2.MIC "Load Patch #7, Segment 2"
1996:185:04:39:33 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:39:36 LOAD CEP07F0.MIC "Load Patch #7, Segment 0"
1996:185:04:41:17 I_CEP_MIN DPUPAGESET X:'0' X:'BA' Page Set for Code Patch #7
load
1996:185:04:41:20 LOAD CEP07F12.MIC "Load Patch #7, Segment 12"
1996:185:04:47:00 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for MST #11 Load
1996:185:04:47:04 LOAD CEPMSTBZF53F.MIC Load MST #11
1996:185:04:48:49 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for MST #12 Load
1996:185:04:48:52 LOAD CEPMSTCZB597.MIC Load MST #12
1996:185:04:50:05 I_CEP_MIN DPUPAGESET X:'1' X:'BB' Page Set for MST #13 Load
1996:185:04:50:08 LOAD CEPMSTDZ8A0F.MIC Load MST #13
1996:185:04:51:37 I_CEP_MIN TLMSTMSET X:B X:D0 Activate MST #11 (Science Mode)
1996:208:01:59:50 I_CEP_MIN IPSQMODDIS X:CC Put the IPS interface into noisy
mode
1996:208:02:00:00 I_CEP_MIN IPSCALEN X:7FFF X:12 Start the IPS autocalibration
operation
1996:208:02:29:40 I_CEP_MIN TLMSTMSET X:FF X:C4 Select HIST histogram
telemetry output
1996:208:02:29:50 I_CEP_MIN HSTCMDSET X:3F02 X:EB Set HIST commandword to 3F02
1996:208:02:30:00 I_CEP_MIN HSTLUTSET X:1C X:CA Select output of HIST Cal C
data
1996:208:02:35:00 I_CEP_MIN HSTCMDSET X:3902 X:E5 Set HIST commandword to 3902
1996:208:02:40:00 I_CEP_MIN HSTCMDSET X:0F02 X:BB Set HIST commandword to 0F02
1996:208:02:45:00 I_CEP_MIN HSTCMDSET X:1702 X:C3 Set HIST commandword to 1702
1996:208:02:50:00 I_CEP_MIN HSTCMDSET X:3702 X:E3 Set HIST commandword to 3702
1996:208:02:55:00 I_CEP_MIN HSTCMDSET X:3B02 X:E7 Set HIST commandword to 3B02
1996:208:03:00:00 I_CEP_MIN HSTCMDSET X:3F02 X:EB Set HIST commandword to 3F02
1996:208:03:05:00 I_CEP_MIN HSTCMDSET X:4702 X:F3 Set HIST commandword to 4702
1996:208:03:10:00 I_CEP_MIN HSTCMDSET X:4F02 X:FB Set HIST commandword to 4F02
1996:208:03:15:00 I_CEP_MIN HSTCMDSET X:5702 X:03 Set HIST commandword to 5702
1996:208:03:20:00 I_CEP_MIN HSTCMDSET X:3F02 X:EB Set HIST commandword to 3F02
1996:208:03:25:00 I_CEP_MIN HSTCMDSET X:5F02 X:0B Set HIST commandword to 5F02
1996:208:03:30:00 I_CEP_MIN HSTCMDSET X:6702 X:13 Set HIST commandword to 6702
1996:208:03:35:00 I_CEP_MIN HSTCMDSET X:6F02 X:1B Set HIST commandword to 6F02
1996:208:03:59:50 I_CEP_MIN IPSQMODEN X:CB Return IPS interface to quiet mode
1996:208:04:00:00 I_CEP_MIN TLMNSTMSET X:5 X:C9 Force output of IPS
autocalibration report
1996:208:04:05:00 I_CEP_MIN TLMNSTMSET X:2 X:C6 "Activate toggle mode (HIST
singles, DEs)"
1996:208:04:05:10 I_CEP_MIN TLMSTMSET X:B X:D0 Return to MST #11 (Science
Mode)
1996:225:03:01:25 I_CEP_MIN TLMSTMSET X'10' X'D5' Change to fixed T/M mode for
maintenance
1996:225:03:01:54 I_CEP_MIN DPUPAGESET X'1' X'BB' Page set for microload to
follow
1996:225:03:02:43 LOAD CEPHST0Z9AE6.MIC Load HIST LUT #0 (cmd-> 3700)
1996:225:03:03:45 I_CEP_MIN DPUPAGESET X'1' X'BB' Page set for microload to
follow
1996:225:03:04:22 LOAD CEPHST1Z8452.MIC Load HIST LUT #1 (cmd -> 3701)
1996:225:03:04:56 I_CEP_MIN DPUPAGESET X'1' X'BB' Page set for microload to
follow
1996:225:03:05:30 LOAD CEPHST2ZF471.MIC Load HIST LUT #2 (cmd -> 3711)
1996:225:03:06:10 I_CEP_MIN DPUPAGESET X'1' X'BB' Page set for microload to
follow
1996:225:03:06:49 LOAD CEPHST3Z9AE6.MIC Load HIST LUT #3 (cmd -> 3700)
1996:225:03:07:31 I_CEP_MIN TLMSTMSET X'B' X'D0' Return to science mode
operation
1996:225:17:30:00 I_CEP_MIN TLMSTMSET X:10 X:D5 Change to fixed T/M mode for
maintenance
1996:225:17:35:00 I_CEP_MIN DPUPAGESET X:1 X:BB Page set for microload to
follow
1996:225:17:40:00 I_CEP_MIN DPUPAGESET X:1 X:BB Page set for microload to
follow
1996:225:17:45:30 I_CEP_MIN DPUPAGESET X:1 X:BB Page set for microload to
follow
1996:225:17:50:30 I_CEP_MIN DPUPAGESET X:1 X:BB Page set for microload to
follow
1996:225:18:00:00 I_CEP_MIN IPSQMODDIS X:CC Put the IPS in noisy mode for cal
1996:225:18:00:10 I_CEP_MIN IPSCALEN X:7FFF X:12 "Start the IPS autocal, all
channels"
1996:225:18:29:50 I_CEP_MIN TLMSTMSET X:FF X:C4 Select HIST histogram
telemetry output
1996:225:18:30:00 I_CEP_MIN HSTCMDSET X:3F02 X:EB Set HIST commandword to 3F02
1996:225:18:30:10 I_CEP_MIN HSTLUTSET X:1C X:CA Select output of HIST Cal C
data
1996:225:18:35:10 I_CEP_MIN HSTCMDSET X:0302 X:AF Set HIST commandword to 0302
1996:225:18:40:10 I_CEP_MIN HSTCMDSET X:0F02 X:BB Set HIST commandword to 0F02
1996:225:18:45:10 I_CEP_MIN HSTCMDSET X:1702 X:C3 Set HIST commandword to 1702
1996:225:18:50:10 I_CEP_MIN HSTCMDSET X:3702 X:E3 Set HIST commandword to 3702
1996:225:18:55:10 I_CEP_MIN HSTCMDSET X:3B02 X:E7 Set HIST commandword to 3B02
1996:225:19:00:10 I_CEP_MIN HSTCMDSET X:3F02 X:EB Set HIST commandword to 3F02
1996:225:19:05:10 I_CEP_MIN HSTCMDSET X:4702 X:F3 Set HIST commandword to 4702
1996:225:19:10:10 I_CEP_MIN HSTCMDSET X:4F02 X:FB Set HIST commandword to 4F02
1996:225:19:15:10 I_CEP_MIN HSTCMDSET X:5702 X:03 Set HIST commandword to 5702
1996:225:19:20:10 I_CEP_MIN HSTCMDSET X:5F02 X:0B Set HIST commandword to 5F02
1996:225:19:25:10 I_CEP_MIN HSTCMDSET X:6702 X:13 Set HIST commandword to 6702
1996:225:19:30:10 I_CEP_MIN HSTCMDSET X:6F02 X:1B Set HIST commandword to 6F02
1996:225:19:35:10 I_CEP_MIN HSTCMDSET X:3702 X:E3 Set HIST commandword to 3702
1996:225:20:00:00 I_CEP_MIN IPSQMODEN X:CB "IPS autocal complete, return to
quiet mode"
1996:225:20:00:10 I_CEP_MIN TLMNSTMSET X:5 X:C9 Force output of IPS autocal
report
1996:225:20:05:10 I_CEP_MIN TLMNSTMSET X:2 X:C6 Force NSTM back to HIST
singles/events
1996:225:20:05:20 I_CEP_MIN TLMSTMSET X:B X:D0 Return telemetry to science
mode
1996:228:11:53:43 I_CEP_MIN TLMSTMSET X:10 X:D5 Change to fixed T/M mode for
maintenance
1996:228:11:54:31 I_CEP_MIN DPUPAGESET X:1 X:BB Page set for microload to
follow
1996:228:11:55:04 LOAD CEPMSTBZ1797.MIC Write MST #11 for HIST ABC/BC toggle
1996:228:11:55:23 I_CEP_MIN TLMSTMSET X:B X:D0 Activate MST #11 science
telemetry mode

Date: Thu, 8 Aug 1996 10:42:09 -0400 (EDT)
From: Robert Sheldon <rsheldon@ceppad.bu.edu>
To: Al Kolasinski <al_kolasinski@qmail2.aero.org>
cc: CEPPAD Team <ceppad-team@lanl.gov>
Subject: Re: Change in HIST High Voltage
MIME-Version: 1.0
Precedence: bulk
Sender: ceppad-team-request@nis.lanl.gov

Al,
I have plotted up the end of July and the beginning of August
(http://buspace.bu.edu/EPG/rsheldon/) and discovered several
things that might be related to your commanding.

1) Starting July 31, the HIST switches modes in the outer
zone. It hasn't done this since May, when you changed the
thresholds on the switching algorithm. This could be due
to a) a lower threshold, b) a shift in the gain, or c) a
really hot outer zone electron population. In support of
b), Harlan finds that the temperature has dropped 10-15
degrees. In support of c) IES shows a lot pedestal
"sags" during this time.

2) IES pedestal channels have moved and narrowed since
1 June. This again could be the well known temperature
dependence of the pedestal. One hopes that it is not
radiation damage, which would probably show a broadening.

3) The integral channel on IPS was broadened to include the
lowest energy channels. This brings out a great sensitivity
to both earth-shine and polar-cap stuff. The end of July
showed some impressive low-energy stuff nearly filling
the polar cap.

4) The BU page listed above now has a link to CAMMICE/MICS data
plotted by Stephano Livi of Max Planck Lindau. Although
the scales are different, it is instructive to see the
composition of these events.

Rob Sheldon
rsheldon@bu.edu

X-Sender: spence@bu-ast.bu.edu
Mime-Version: 1.0
Date: Wed, 7 Aug 1996 15:58:39 -0500
To: ccr-team@lanl.gov
From: spence@bu.edu (Harlan E. Spence)
Subject: CEPPAD State of Health: The hot and the cold of it....
Precedence: bulk
Sender: ccr-team-request@nis.lanl.gov

To interested parties,

This is just a note to point out that the CEPPAD instrument temperatures
have evolved as the spacecraft orbital plane has moved through local time.
Early on, we were in a fairly "hot" configuration and as we have swung
toward the dawn-dusk plane the instruments have cooled down nicely. For
instance, as of 8/4/96 we see the following typical readings (approximate
by my eye-ball!) compared to earlier readings taken during non-eclipse
intervals (eclipses can drive the temperatures down an additional 10
degrees or more!):

-----------------------------------------------------------------------------

8/4/96 | 3/4/96 4/4/96 5/4/96 6/4/96 7/4/96
------ | ------ ------ ------ ------ ------
DPU +23 | +28 +30 +26 +34 +25
IPS -18 | 0 -1 -3 -5 -18
IES +12 | +15 +17 +14 +20 +13
HIST +16 | +22 +25 +21 +28 +18

Notes:

(1) Polar went through 12-00UT plane on 4/17/96.

(2) The HIST and the DPU are both in close thermal connection with the
spacecraft instrument shelf and are probably tracking the temperature of
that interface fairly closely. The delta-T's of those two track to within
my ability to read from the GIF image.

(3) The IES is connected to the HIST and they track pretty closely as well
in delta-T, with a bit of a thermal buffer of about ~6 degrees between the
two.

(4) The IPS is thermally isolated from the DPU and was designed to follow
more closely the solar array temperature. That seems to be born out both
by the much lower temperatures seen as well as the more dramatic swings in
temperature during the eclipse seasons.

(5) Thanks to Anders for generating these data for plots for C and C!

-----------------------------------------------------------------------------

While we are in the process of converting counts to fluxes and ascribing
energy values to ADC bins, please bear in mind that it is possible that
some gains are a function of temperature (i.e., Al K. is currently checking
on the possible response of the HIST amplification system to thermal
variations and I am doing the same with the IPS). Both instruments have
gone through several calibrations to check these changes - one very
recently. Preliminary indications are that the IPS is extremely
insensitive to gain drift. I will leave it to Al to report on what he sees
with HIST.

I think it is generally good news that we have gone through probably the
extremes of temperatures likely to be seen (expect for the end of mission
warming) and have seen no major changes in instrument performance. Indeed,
the lower temperatures we are experiencing now are especially good for
lowering the intrinsic noise of SSD amplification electronics. For
instance, we had hoped to be below -5 C on IPS to take advantage of the
thermal properties of the sensor system and I am pleased that we have
realized that target.

At present, as Anders reported today, the up-to-date images are available
on-line as GIF images. We are talking about constructing monthly plots to
better view the thermal history, but that is only on the wish list at
present.

Cheers! --- Harlan

Date: Sat, 6 Jul 1996 14:00:17 -0700
From: "Joe Fennell" <joe_fennell@qmail2.aero.org>
Subject:CEPPAD Changes
To: "CEPPAD Sci Team" <ceppad-team@lanl.gov>
Precedence: bulk
Sender: ceppad-team-request@nis.lanl.gov

Subject: Time: 8:33 AM
OFFICE MEMO FWD>CEPPAD Changes Date: 7/3/96

The edited message below from D. Mabry describes several CEPPAD configruation
changes that were implemented on July 3. These had been discussed with the
Boston Univ. IPS and HIST representatives during a two day meeting at
Aerospace in late June. Please look carefully at the data taken following
these changes and keep us informed as to the results. Be especially alert for
changes related to the code patch since the the previous problems were subtle
and occured a small percentage of time. (Thanks to Mike Redding for bringing
these to our attention. They took a long time to verify.)

For IPS, we need to quickly assess the viability of keeping the integral
channel start point at CH-0. The on-going efforts of Karen Hirsch to compare
the nominal energy levels of each IPS pixel, especially at low energies, may
cause us to switch this back to a higher channel at a later date. The primary
reason for swithching to CH-0 was to enhance the sensitivity for neutrals on
this the most highly sampled data output.
------------------------------------------------------------------
Date: 7/3/96 12:47 PM
From: Dan Mabry
Load operations for CEPPAD on day 185 (July 3) were required to

(a) reload the three "nominal" mode tables to redefine the IPS low integral
energy to bin 0, and

(b) to load a software patch to fix a telemetry/mode switching problem which
has persisted since launch.

The DPU was switched to fixed telemetry mode at ~185:04:22:00 prior to the
first load, and was switched back to nominal science mode at ~185:04:51:37
after all changes had been loaded and verified.

MST tables 11, 12, and 13 were reloaded to move the low bin for IPS
integral channels down to channel 0. The previous setting was bin 3.

Following the patches, MST #11 was activated as the default mode. As a
reminder (or perhaps for your first information), the Mode Switching Tables
(MSTs) contain:
-----------------------------------------------------------------------
MST 11: (in use after patches)
1) 16 spins with:
Telemetry table 4 (reduced telemetry for IES pedestal channels)

IES Lookup table default #0 (10 usec/large, autoswitching enabled)

HIST Lookup table default #0 (ABC mode, autoswitching enabled)

IPS Lookup table #5 (Log spaced, 1500 KeV range, autoswitch
disabled).

IPS Background channel T1 selected

IES low integral bin = 6

IPS low integral bin = 0

2) then 16 spins with: same as above except IPS Background channel B1
selected

3) then, 16 spins with: same as above except IPS Background channel C1
selected

then repeat from 1) at top of table -
-------------------------------------------------------------------
MST 12:
1) 16 spins with:
Telemetry table 4 (reduced telemetry for IES pedestal channels)

IES Lookup table default #0 (10 usec/large, autoswitching enabled)

HIST Lookup table default #3 (ABC mode, autoswitching disabled)

IPS Lookup table #5 (Log spaced, 1500 KeV range, autoswitch
disabled)

IPS Background channel T1 selected

IES low integral bin = 6, IPS low integral bin = 0

2) then, 16 spins with:
same as above except IPS Background channel B1 selected

3) then, 16 spins with:
same as above except IPS Background channel C1 selected

then repeat from top of table -
-----------------------------------------------------------------
MST 13: (in use after patches)
1) 16 spins with:
Telemetry table 4 (reduced telemetry for IES pedestal channels)

IES Lookup table default #0 (10 usec/large, autoswitching enabled)

HIST Lookup table default #0 (0.5BC mode, autoswitching disabled)

IPS Lookup table #5 (Log spaced, 1500 KeV range, autoswitch
disabled)

IPS Background channel T1 selected

IES low integral bin = 6, IPS low integral bin = 0

2) then, 16 spins with:
same as above except IPS Background channel B1 selected

3) then, 16 spins with:
same as above except IPS Background channel C1 selected

then repeat from top of table -
--------------------------------------------------------------------
Also, as I mentioned a patch was required to fix a software bug which has been
in place since launch. First, to describe the normal operation:

Upon receipt of a ground mode switch command (TLMSTMSET), the DPU
activates an MST as described above. In order to remain in each mode for 16
spins, the DPU has a downcounter, decremented by 1 in each spin, to know when
IES, HIST, and IPS lookup table and commandword changes should occur. As a
separate activity, multi-spin data readouts are subcommed to the telemetry
stream by 1, 2, 4, 8, or 16 spins using a subcom counter (known as the Scom
value) which runs from 0 to 255 and incremented by 1 with each spin output.
The flight software problem occurs when the mode change down-counter and the
subcom up-counter get out of sync.

The flight software as launched had roughly 500 msecs between the two
counter updates on each spin (~6 secs). Receipt of the TLMSTMSET command jams
both counters to start the new mode operation, and because it can occur after
one counter has been updated but before the other, it is possible to cause the
synchronization to exactly lock but with the two counters being off by 1
count. When this occurs, the out-of-sync state locks forever or until the
next TLMSTMSET command. When in this erroneous state, the effect on CEPPAD
operations is that the command-word and lookup table will change one spin late
causing multi-spin accumulated data to contain data from both before and after
the state change. However, if neither the command-word or the lookup table
are changed at the 16 spin boundary, then all data are correct and properly
read out by the Scom value.

Computation of software timing done in simulation estimated the size of
the "error" window at .5 secs / 6 secs = 8.3%. Tests done with the
engineering model at Aerospace (before the patch) gave results of 6 errors /
120 commands = 5%. Following the patch code, the same test gave 0 errors /
1700 commands. As part of the software patch operation, the "Firmware
Version" number output from the DPU as housekeeping was updated to 7 (previous
version was 6).

Michael Redding and Jim Roeder have (or are) adding a data quality check
for this error type to be incorporated in their next distribution of Lo-->L1
software. Discussions within the team regarding how much data should be
thrown away are under way. Contaminated data includes only multi-spin
accumulated data where automatic mode switches occur (maximum 8 times / day),
and all the multi-spin accumulated IPS background data. Days known to be
effected affected include: 3/19 - 3/20 and 4/30 - 7/3.

Regards, Dan Mabry (JFF)

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