The external Dt lamp was used to obtain slitless spectra at the field center. The width of each continuum spectrum gives a measure of the PSF in the spatial direction. The two new vents were illuminated with a visible light source and a mercury penray lamp to evaluate their light rejection performance. Images were acquire in modes 3.6 and 2.6. A calibrated radiometer, the same used in previous tests of the original vents, was used to measure the light levels at the new vents.
Preliminary analysis indicates satisfactory light rejection performance.
The goal of this procedure was to check the read noise performance as a function of the negative rail voltage of the serial clocks. CCD Rapid Gain Switching Bias frames, dark frames and flat field exposures suitable for gain and edge response CTE evaluations were acquired at all for gain settings both in an extended sequence at each gain setting and in rapid switching between gain settings. These data will be used to determine if there are any short term effects on the, noise, bias level, dark current, or CTE due to parallel clock voltage switching between exposures. See description for frames 13920-13933 above. Low Signal Level Exposures Part 2 The goal of this test is to compare flat fields obtained at low signal levels to those obtained at high signal levels.