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7.9 Absolute Sensitivity of the f/48 Detector

The DQE of the f/48 camera was never calibrated systematically because the existing spectrophotometric standards are generally too bright and the f/48 relay has no neutral density (ND) filters to attenuate their fluxes. A calibration program was developed and run in December 1993, after COSTAR was installed but before it was deployed. The results of this program are presented in FOC ISR 077. This study indicated that the sensitivity from about 1800 Å to 3000 Å appears to be about 60% of the prelaunch estimate of sensitivity, with some uncertainty because the data used to derive this factor were less than ideal.

In general, f/48 fluxes must be considered quite uncertain. A typical error estimate of +/- 30% is appropriate.

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