Further examination of the serial-digital secondary science records shows that prior to the anomalous scalar rate data there were housekeeping voltages and temperatures containing anomalous data. None of the strictly digital housekeeping data (e.g. bi-levels or commanded HV steps) displayed anomalous values. All bi-level, passive-analog, and active-analog "engineering" telemetry appeared nominal.
The secondary science data are the first 72-bytes of serial-digital
data from the HRC at the start of a major frame when the HRC is
configured for next-in-line telemetry or from the start of a
"science-frame" when the HRC is configure for observing-mode
telemetry. The layout of the secondary science is given at
section 2.1 of SAO-HRC-TLIST-98-313.
Anomalous data were observed for MSIDs 2C15PALV
through 2FE00ATM. The MSIDs
2CE00ATM and 2CE01ATM do
not appear when in next-in-line mode and when in observing-mode
they do not exhibit as many obviously bad values as the
preceding MSID (FE00ATM) or the following
scalar rate data.
Bad secondary science housekeeping data observed on day 2005:349.
MSIDs from 2C15PALV to 2FE00ATM
A "*" under the byte number indicates where the housekeeping value is
KNOWN to be bad
A "x" in the MNF (minor frame) column indicates that the HRC secondary
science data were telemetered in next-in-line mode, so the bad data
may have been spread over multiple minor frames
Byte number of the 72-byte secondary science stream
333444444444455555555566
MJF MNF 789012345678901234578923
99061 x - * *******************
99087 x - *********
99108 x - **** *** ***** ****** **
99122 x - * *******************
99135 x - * *******************
99145 x - ******************
99147 x - *****************
99155 x - ******************
99158 x - ** *******************
99167 x - ********
99170 x - **
99215 x - *****
99220 x - **
99231 x - *******
99272 x - **********
99280 x - ******
99301 x - ********
99306 x - ********
99317 x - ********
99349 x - *******
99359 x - *****
99364 x - ******************
99438 x - *****************
99446 x - * *******************
99460 56 - * **************** **
99463 56 - *******************
99464 104 - ********
99465 48 - **
99465 104 - **
99468 8 - *****************
99468 24 - * *******************
99468 32 - *******************
99469 32 - * **************** **
99470 24 - *******
99471 8 - ****************
99471 88 - **
99472 32 - *****
99472 72 - ****************
99472 104 - ****************
99473 48 - *****
99473 72 - * *******************
99473 120 - * *******************
99474 16 - * *******************
99474 32 - ****************
99474 64 - *****
99474 120 - *****
99475 120 - ********
99476 0 - *****
99476 24 - **
99476 96 - **
99477 120 - **
99478 16 - *****
99478 32 - ************
99478 56 - ******
99478 64 - *******
99480 0 - ****************
99480 64 - ******
99480 88 - *****
99480 112 - *******
99482 88 - **** *******************
99483 0 - *****
99484 32 - *******
99484 64 - **
99484 88 - *******************
99484 120 - *****
99485 24 - *******
99485 120 - *****
99486 112 - ************
99488 32 - * *******************
99488 80 - ********
99488 112 - **
99489 40 - **
99489 48 - *************
99489 112 - *****
99490 40 - *******
99490 48 - *******
99490 56 - *******************
99491 0 - *****************
99492 64 - ****************
99492 96 - *******************
99492 104 - *******
99492 112 - **
99493 32 - * *******************
99493 96 - *******
99494 0 - *****************
99494 48 - ************
99494 120 - *********
99495 56 - *******
99496 96 - *******
99498 40 - *******
99498 48 - *********
99501 56 - *********
99501 72 - *******
99504 32 - ********
99506 40 - ************
99507 32 - **** *******************
99508 24 - **
99509 24 - ************
99512 24 - ********
99513 96 - ****************
99515 8 - *******
99517 48 - ********
99518 8 - ********
99518 56 - ****************
99518 120 - *****************
99520 24 - *******
99522 32 - *******************
99524 112 - ****************
99528 88 - *** *******************
99531 0 - *********
99532 8 - *** *******************
99532 56 - *** *******************
99532 104 - *********
99535 32 - ****************
99536 96 - *********
99539 88 - *** *******************
99540 56 - *****************
99540 80 - *******
99541 16 - * *******************
99541 56 - * *******************
99542 120 - * *******************
99543 40 - ****************
99544 120 - * *******************
99553 88 - *******
99554 88 - ****************
99557 64 - **** *******************
99558 120 - *******************
99560 48 - *****************
99566 88 - *** *******************
99570 40 - *********
99576 8 - ************
99581 0 - *****
99581 88 - **
99602 104 - ************
99612 40 - ************
There is the possibility that the anomalous data is generated due to a thermal problem. The temperatures in the HRC during the time interval with anomalous data on day 2005:349 were among the highest seen. An examination of data during times with similarly high temperatures also show anomalous housekeeping data values. However, a complete search for additional periods of anomalous data has not yet been finished to demonstrate that it does not occur at lower temperatures.
No obviously bad primary science telemetry (event data) is seen.
Mike Juda Last modified: Wed Dec 21 13:45:03 EST 2005