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Next: 13.4 Selection of read-outs
Up: 13 Calibration G Products
Previous: 13.2 Observation time dependent
Description Parameter: section 3.2.3
Processing Level: SPD
Usage in processing: section 7.2.5
File Type: Binary FITS table
Number of Records: 3
File Names: PDIE1TRANS, PDIE2TRANS
There are 2 sets of Detector Interface Electronics (DIE) in the external
electronics unit (see section 3.2.3). The DIE subtracts a
commandable offset from the cold readout electronics voltage and amplifies
the difference with a commandable gain factor. There were 3 possible DIE
settings available but in practice only one was used. To convert the
digital numbers (DNs) to Voltages, a set of ``gain'' parameters were used
depending on which of the 3 possible settings were commanded. See also
section 7.2.5 for the conversion formula.
The possible settings of the 2 DIEs are stored in 2 Cal G products. Both DIEs were used during operations depending on which detector was active, the relation between detector and DIE is given in Table 13.1. Each record in the Cal G products refers to the settings for a given DIE gain that was commanded, see Table 13.2.
Binary FITS table with record length 16. The record fields are:
Field Offset Number Type Description PDIE1FIX 0 1 R*4 Fixed offset PDIE1UOF 4 1 R*4 Offset dependent on signal gain in V PDIE1GN1 8 1 R*4 Signal gain (=GAIN1) PDIE1GN1 12 1 R*4 Offset gain (=GAIN2)
Similar to PDIE1TRANS, but DIE1 should be substituted by DIE2.
ISOPHOT Data Users Manual, Version 4.1, SAI/95-220/Dc