10.16 PHT-S Dynamic Spectral Response Calibration

The nature of the PHT-S dynamic spectral response calibration (Section5.2.6) implies the following restrictions for measurements executed with AOT P40 in staring mode:

Caveat:  The transient behaviour of the PHT-S detectors is temperature dependent. The calibration was established for a certain temperature range of the detectors. Since PHT-S was not actively temperature controlled, the detector temperature can occur outside the calibrated range (2.7K $<\,T\,<$ 3.1K). In this case, a different transient behaviour of the signals can be observed, leading to absolute and relative accuracies which are worse than quoted. A warning message is included in the PSSS and/or PSLS product headers.

Caveat:  For certain wavelength ranges, fluxes of some targets can be outside the range covered by standard stars. For these targets a worsening is possible of the accuracy in the relative spectral shape. A warning message is included in the PSSS and/or PSLS product headers.

The scientific validation of the PHT-S observations led to the following two general caveats:

Caveat:  The Zodiacal Light level (see Section4.9.3) is below the sensitivity limit of PHT-SS where the Zodiacal Light intensity is less than 1MJysr$^{-1}$ for 2.5 to 4.9$\mu$m.

Caveat:  Quoted absolute accuracies are only valid for the Zodiacal Light level in the PHT-SL range (Zodiacal Light intensity $\sim$ 5 $-$ 20MJysr$^{-1}$ for 5.8 to 11.6$\mu$m), if the exposure time is $\ge$ 1024 seconds.