Description Parameter: Section 2.4.3 Processing Level: SPD Usage in processing: Section 7.2.6 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 2.4.3). 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 7.2.6 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 14.1. Each record in the Cal-G products refers to the settings for a given DIE gain that was commanded, see Table 14.2.
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 (=GAIN) PDIE1GN1 12 1 R*4 Offset gain (=GAIN
)
Similar to PDIE1TRANS, but DIE1 should be substituted by DIE2.