STEREO/HET/SIT Configuration Tracking Form


To be filled in by configuration manager:


Tracking Number:  00028      Date Received:   09/08/05



To be filled in by initiator:


Software Type:    Flight Software                   Instrument Name:    SIT


Version Name:  20040903  (Build 1.2)         Type of Action:   New Feature

Initiator's Name: Glenn Mason       Date Initiated:  09/03/04



To be filled in by initiator:


Description of action(s)/problems(s):   New flight matrix lookup tables are needed for on board event processing. Three of the tables contain information about the calibration of
the solid state detector energy system and the time of flight system.  These three tables allow a conversion from raw data to pseudo-physical
units for on-board processing.  The fourth table is used for on-board  generation of the SIT matrix rates.  There are 128 such rates, read out
once per 60 sec.  Each ion event analyzed by the instrument has its  pseudo-mass and energy calculated using the first three lookup tables
and a simple algorithm.  Then, the computed pseudo-mass and energy are  looked up in the fourth table to see if they fall within a pre-defined
range that is associated with one of the 128 rate counters.  If they do, the counter is incremented;  otherwise the event is not counted. 
This allows SIT to generate particle spectra with 60s time resolution.  The tables and algorithms are described in more detail in the SIT
description document on the HET & SIT web site (


To be filled in by Programmer:


Software Version Name:    200500908  (Build 1.3) 


Programmer(s) Name:        T. Nolan


Date Completed:       0908/05

New Tables:             fm1:    generated 090105         checksum lower 24 bits (hex): 19750
                                fm2:    generated 090605         checksum lower 24 bits (hex):  F61150                                                                   


Comments:    New tables were added to the SIT_FSW20040903 binaries, no coding changes were made.   The software version on the HK will still read 0903.   There are now 2 differnt tables, one for each flight model, therefore the flight code binaries will now be different and can be distinguished by the table checksums mentioned about that are contained in the HK packet.

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