WFC3 SMOV Proposals 11419,11426,11431, and 11448: On-Orbit Biases

Details WFC3 SMOV Proposals 11419,11426,11431, and 11448: On-Orbit Biases WFC3 SMOV Proposals 11419,11426,11431, and 11448: On-Orbit Biases

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfc..rept...26b&link_type=abstract

WFC3 Instrument Science Report 2009-26, 15 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3

Scientific paper

This report summarizes the basic on-orbit characteristics of the WFC3 UVIS SMOV bias frames. We investigate and report on properties such as the bias levels, the overscan region, the read noise, and describe characteristics of the superbias. The average mean bias levels measured in 89 full-frame, four-amp bias image readouts is 0.096, 0.071, 0.038, and 0.007 e- for amps A, B, C, and D respectively. Our analysis of overscan regions show possible overscan correction improvements. The read noise levels are measured for the full-frame, four-amp biases using a gain level of 1.5 e-/DN, are 2.91, 2.99, 2.90, and 3.01 e- for amps A, B, C and D. The average mean superbias level has been measured as 0.081 DN for chip #1 (amps A and B) and 0.022 DN for chip #2 (amps C and D) in agreement with the ground superbias level of 0.078 DN for chip #1 and 0.013 DN for chip #2. An on-orbit superbias is to be installed in CDBS in October 2009.

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