WFC3 TV3 Testing: UVIS-1' Gain Results

Physics

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Thermal Vacuum Test, Tv3

Scientific paper

Thermal-vacuum (TV3) level tests using the integrated WFC3 instrument, with the UVIS- 1' detector in place, were performed at Goddard Space Flight Center (GSFC) during the spring of 2008. Flatfield data were acquired to allow an absolute gain measurement using the mean-variance method at the nominal gain 1.5 setting, in both unbinned and binned modes. The CCDs were at the nominal operating temperature of -83C. The gain in unbinned mode was measured at 1.56, 1.56, 1.58, and 1.57 e-/DN for quadrants A,B,C, and D, respectively, with errors ~0.01 e-/DN; these values are within 1-2% of those measured for UVIS-1 during TV1. The TV3 gain values for the binned modes were within 1% of the unbinned mode gain, specifically, 1.56, 1.55, 1.58, and 1.57 e-/DN for 2x2 mode and 1.55, 1.55, 1.56, and 1.56 e-/DN for 3x3 mode, for A,B,C, and D, respectively, with errors ~0.01 e-/DN.

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