Analysis of startup and shutdown sequences, Campaign 1

Abstract:  All SRSRN and SURN results are within the limits.  SL 
exceeds the 20% SURN stability limit in the first half of the 
campaign, and LL comes close to exceeding the 20% yellow limit for 
SURN stability with a 17% increase in noise during the campaign.  
The photoresponse remains stable, although one pixel in LL and one 
pixel in LH exceeded the yellow limit.

Analysts:  Lei Hao and Greg Sloan
Procedure version:  2.7
Campaign 1, Startup, shutdown, middle
DOY 348
CE1 used for all data collection
AORKEY = 8239872 for startup
AORKEY = 8264192 for the mid-campaign anneal sequence
AORKEY = 8240128 for shutdown
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     8.2     8.2    15.0    12.2    12.2 
    SH       8.8     6.7     7.5    15.0    12.8    12.8 
    LL      14.5    12.0    10.8    15.0    12.9    12.8 
    LH      17.6    15.7    17.1    15.0    12.9    13.1 

Unruly.pro results for middle (IRS-002):

    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    10.0     8.3    15.0    12.3    12.3 
    SH       8.8     6.5     7.3    15.0    12.8    12.7 
    LL      14.5    11.6    11.1    15.0    12.8    12.9 
    LH      17.6    17.4    17.6    15.0    13.0    13.1 

Unruly.pro results for shutdown (IRS-003):

    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     7.8     8.5    15.0    12.2    12.3
    SH       8.8     6.8     7.1    15.0    12.7    12.8
    LL      14.5    12.6    12.5    15.0    13.0    13.0
    LH      17.6    16.6    16.9    15.0    13.1    13.2

    The analysis applied the PIRAT procedure unruly.pro to
    FITS files generated by MIPL.

    For SUR data, the quoted values are the standard deviation
    of the read noise map.  For SRS data, these are the median
    of the standard deviation map.

    Comments:  All data are within limits in both startup and
    shutdown.

Changes in read noise between anneals and from startup to shutdown:

            SUR data                       SRS data
            002pre/   003pre/    003pre/   002pre/   003pre/    003pre/
    Module  001post   002post    001post   001post   002post    001post

    SL      1.22      0.94       0.95      1.01      0.99       1.00
    SH      0.87      0.93       0.91      1.00      1.00       0.99
    LL      1.07      1.14       1.17      1.00      1.01       1.02
    LH      1.02      0.94       0.97      0.99      1.00       0.99

    Comments:  The stability in SRSRN remains remarkably good.  The 
    SURN data are also stable, although SL is marginally over the 20%
    yellow limit in the first half of the campaign.  LL shows a 14% 
    variation in read noise in the second half of the campaign, and a 
    17% variation overall, which is near the 20% yellow limit.

Photoresponse stability:

    Module  002 pre to 001 post  003 pre to 002 post  003 pre to 001 post
            yellow  red          yellow  red          yellow  red
    SL        0       0            0       0            0       0
    SH        0       0            0       0            0       0
    LL        1       0            0       0            0       0
    LH        0       0            0       0            1       0

    Comments:  In all of the cross comparisons, no pixels exceed the 
    red limit and only two pixels exceed the yellow limit.  In LL, 
    pixel (57,36) has a value of 1.057 in the 002/001 photoresponse 
    ratio image.  This image shows evidence of faint latent spectra and 
    a shift in zodiacal emission level, all within 5%, but enough to 
    push this one pixel over the limit.  In the LH photoresponse ratio 
    image (003/001), one pixel exceeds the 5% yellow limit:  (65, 69).