A brief report on the startup anneal sequence for IRS Campaign 25

10 Oct 05

Abstract: The major anticipated result is that LH, in its reduced
bias setting, is showing much less noise than before, moving to
SURN values between 11 and 12 DN, compared to previous results 
between 18 and 21 DN with the higher bias settings.  The other 
modules appear to be behaving as they did previously.

Analysts:  Lei Hao & Greg Sloan
Procedure version:  2.7
Campaign 25, Startup, shutdown and middle anneal
YEAR 2005 DOY 282
CE1 used for all data collection
AORKEY =   16069888  for startup
Number of files = 64 for each
No known errors.

Steps 2 through 5 run OK.

Unruly.pro results for startup (IRS-001):

    Noise characteristics of the modules (in DN)

            SUR data                SRS data
            noise   pre     post    noise   pre     post
    Module  limit   anneal  anneal  limit   anneal  anneal

    SL     8.8      8.4      9.1    15.0     12.2     12.3
    SH     8.8      7.5      7.5    15.0     12.8     12.8
    LL    14.5     13.8     12.2    15.0     13.0     12.9
    LH    17.6     11.3     12.0    15.0     12.8     12.7

Comments:  The primary result is that the new lower bias 
setting for LH has had an obvious impact on the LH noise.  
Typical SURN values for the last several campaigns ranged 
between 18 and 21 DN, and now the LH SURN results are down 
to 11-12 DN.  That is excellent news.  As for the other 
results, SRSRN results are as before, with all tests 
passing, and the SURN results are as usually seen as well, 
with SL exceeding its 8.8 DN limit in one of two tests and 
SH and LL behaving within limits.