Readnoise and Dark Current in WFC3 Flight CCD Ambient Data

Details Readnoise and Dark Current in WFC3 Flight CCD Ambient Data Readnoise and Dark Current in WFC3 Flight CCD Ambient Data

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004wfc..rept....1b&link_type=abstract

Instrument Science Report WFC3 2004-01, 7 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Readnoise, Dark Curent, Ambient Data

Scientific paper

Readnoise and dark current levels of the CCD flight detectors have been measured from data taken during an initial verification test at GSFC of the WFC3 UVIS channel. Even at the relatively warm operating temperature of the test (-74oC), the readnoise and dark current are well within contract-end item (CEI) specifications. The readnoise values are in the range of ~3 electrons, and generally within 15% of the pre-ship values measured at Ball. The dark levels, 0.55 to 0.95 e-/pix/hr, are in good agreement with the pre-ship values. The data also reveal the presence of a light leak in the set up, when the night lights in the test facility were left on. This was remedied by taking additional data later during testing with the night lights off.

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