CCD Read noise monitor
The process of reading out a CCD detector results in small amount of unavoidable
electronic noise that is present even in exposures of zero length. The amount of
this noise varies with the gain and binning used for the read out and also can
vary over time. The read noise is periodically measured for all the amplifiers
of the STIS CCD (only amp D is used for science operations) using pairs of bias
frames. Full frame and binned observations are made in both Gain 1 and
Gain 4, with binning factors of 1x1, 1x2, 2x1 and
2x2. Here we provide plots and tables summarizing these read-noise
measurements over time. Further details can be found in
STIS ISR 2001-05
and STIS ISR 98-31.
Table of all data used to make tables and plots
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