Other
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfc..rept...23h&link_type=abstract
Instrument Science Report WFC3 2009-23, 37 pages
Other
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
Using data taken during Servicing Mission Observatory Verification (SMOV), we characterized the basic behavior of the IR Channel. Unless otherwise indicated, results in this report refer exclusively to those obtained during SMOV program 11420, with the IR detector temperature of -128 C. The correlated double sampling (CDS) read noise in RAPID sequences is 19.8 - 21.9 electrons, similar to the 20.0 - 22.0 electrons measured in TV3 (Hilbert 2008a), and equal to the Contract End Item (CEI) Specification of 21.2 electrons. The dark current measured from SPARS200 ramps is 0.030 - 0.048 e-/s/pixel, better than the CEI specification of <0.4 e-/s/pixel. From the internal flat fields through the F125W filter, we measured an inverse gain of 2.28 - 2.47 ± 0.04 e-/ADU, depending on quadrant. The ratio of the mean on-orbit instrumental irradiance (ADU/s/pixel) to ground test measurements is 1.06 - 1.07, indicating a brightening of the Tungsten lamp on orbit. We note there are differences in the signal rate of up to 3% between full frame flat field images and the smallest subarrays.
Hilbert Bryan
McCullough Peter R.
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