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5.1 Overview  

The photometric calibration of ISOPHOT observations is described in this chapter. The calibration strategy for PHT-P and PHT-C using the FCS and the strategy for PHT-S are given in section 5.2. In the subsequent sections the extended source photometry, aperture calibration, and the PHT-S wavelength calibration are described. Section 5.6 summarizes the specific calibration procedures per AOT. Finally, a general description of the kind of calibration files used in OLP is given in section 5.7. Note that the uncertainties in the calibration are not addressed in this chapter, we refer to the related documents `ISOPHOT Error Budgets' [15] and `ISOPHOT calibration accuracies' [11] for full discussions. A number of observation modes are not scientifically validated, see chapter 9.