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Subsections
Description Parameter: section 7.4.6
Processing Level: SPD
Usage in processing: section 7.4.6
File Type: Binary FITS table
File names: PTIMEDEP
During the mission two events took place that directly affected
calibration parameters of the instrument:
- the change in the illumination properties of the TRS2 of FCS1 which
took place in the activation window of revolution 94. The illumination
power for the same electrical power applied to the FCS increased by
approximately a factor two. The cause of the change
is not clear. The change in FCS properties requires different
calibration parameters for FCS related calibrations of P3, C100 and
C200.
- the addition of an extra curing procedure for detectors P3, C100
and C200 during the otherwise idle telescope time in ground
station handover between VILSPA and Goldstone sometime after
the apogee passage of ISO. The extra curing was introduced on rev 150
and affects the orbit dependent responsivity of the three detectors.
Consequently, the OLP must use different sets of Cal G files depending on the
date and time of the observation. This calibration file lists the names of
the Cal G files that are affected together with the date and time when the
change took place. Depending on the time of the observation the appropriate
Cal G files are selected.
Binary FITS table with record length 80. The record fields are:
Field Offset Number Type Description
CALGROOT 0 1 C*12 Root name: referred to when file is opened
CALGFILE 12 1 C*12 Corresponding filename
CALGTIME 24 1 C*11 Time from which this file applies
in yydddhhmmss
CALGCOMM 35 1 C*45 Optional comment
Next: 13.3 DIE power calibration
Up: 13 Calibration G Products
Previous: 13.1 Overview
ISOPHOT Data Users Manual, Version 4.1, SAI/95-220/Dc