Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008wfc..rept...22m&link_type=abstract
Instrument Science Report WFC3 2008-22, 13 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Test Vacuum Test, Read Noise, Uvis-1' Detector
Scientific paper
We examine the read noise of the flight UVIS-1' detector of the Wide Field Camera 3 during its third thermal vacuum campaign at the Goddard Space Flight Center. Only the frames acquired at the default gain of 1.5 e-/DN and four amplifier readout (ABCD) are considered. The read noise at a temperature of -82 C and for no on-chip binning, calculated from the pairwise subtraction of bias frames, is 3.03 ± 0.04, 3.13 ± 0.01, 3.08 ± 0.02, and 3.18 ± 0.01 e- for amplifiers A, B, C, and D, respectively. At binnings of 2x2 and 3x3, the noise is higher by up to 10%. Amplifier D has the highest read noise for all binnings. The read noise calculated from the serial virtual overscan correlates with the level of the imaging area - the pairwise subtraction of bias frames is therefore the preferable method for estimating the read noise. The CEI specification of a read noise of < 4 e- is easily met for an operating detector temperature of less than -20 C. There is no difference in the read noise between MEBs 1 and 2. A superbias frame shows no weak odd/even effect in any quadrant. We also investigate the overall noise trends of the flight IR-4 detector for the RAPID and SPARS25 sampling sequences. The CDS noise on MEB2 is lower than on MEB1. The largest difference is about 0.8 e- in quadrant 4. Quadrants 2 and 3 are the least noisy for MEB2 and MEB1, respectively.
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