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9.5 Calibration-G files

 

There are forty-nine files in this section:

SC01 SWS Cal-G 1 Electrical crosstalk matrices
SC02 SWS Cal-G 2 RC correction timescales
SC02A SWS Cal-G 2A Midbit values
SC02B SWS Cal-G 2B Shape correction values
SC03 SWS Cal-G 3 Reset cutout lengths
SC04 SWS Cal-G 4 Amplifier limits
SC05 SWS Cal-G 5 Switchable gains
SC06 SWS Cal-G 6 Glitch reject levels
SC07 SWS Cal-G 7 Grating detector noise characteristics
SC08 SWS Cal-G 8 Grating calibration specifications
SC09 SWS Cal-G 9 LVDT-Angle  relation
SC10 SWS Cal-G 10 Key wavelengths 
SC11 SWS Cal-G 11 FP calibration spectrum
SC12 SWS Cal-G 12 Gap-position relation
SC13 SWS Cal-G 13 Relative flux
SC14 SWS Cal-G 14 Intensity of internal calibration sources
SC15 SWS Cal-G 15 Intensity of calibration sources
SC16A SWS Cal-G 16A Aperture offsets
SC16B SWS Cal-G 16B Element offsets
SC16C SWS Cal-G 16C Grating constants
SC16D SWS Cal-G 16D Telescope area
SC16E SWS Cal-G 16E Scanner curve coefficients
SC18 SWS Cal-G 18 Effective gap correction
SC19 SWS Cal-G 19 AOT 1 resolution factors
SC20 SWS Cal-G 20 Relative detector responsivity
SC21_1 SWS Cal-G 21_1 Detector dark current/noise for 1 sec reset
SC21_2 SWS Cal-G 21_2 Detector dark current/noise for 2 sec reset
SC21_4 SWS Cal-G 21_4 Detector dark current/noise for 4 sec reset
SC21_8 SWS Cal-G 21_8 Detector dark current/noise for 8 sec reset
SC22 SWS Cal-G 22 Detector response to internal diffuse source and flusher
SC23 SWS Cal-G 23 Wave limits for bands
SC24 SWS Cal-G 24 Wave limits for apertures
SC25_1A SWS Cal-G 25_1A Spectral responsivity for band 1A - RSRF  file
SC25_1B SWS Cal-G 25_1B Spectral responsivity for band 1B
SC25_1D SWS Cal-G 25_1D Spectral responsivity for band 1D
SC25_1E SWS Cal-G 25_1E Spectral responsivity for band 1E
SC25_2A SWS Cal-G 25_2A Spectral responsivity for band 2A

SC25_2B SWS Cal-G 25_2B Spectral responsivity for band 2B
SC25_2C SWS Cal-G 25_2C Spectral responsivity for band 2C
SC25_3A SWS Cal-G 25_3A Spectral responsivity for band 3A
SC25_3C SWS Cal-G 25_3C Spectral responsivity for band 3C
SC25_3D SWS Cal-G 25_3D Spectral responsivity for band 3D
SC25_3E SWS Cal-G 25_3E Spectral responsivity for band 3E
SC25_4 SWS Cal-G 25_4 Spectral responsivity for band 4
SC25_5A SWS Cal-G 25_5A Spectral responsivity for band 5A
SC25_5B SWS Cal-G 25_5B Spectral responsivity for band 5B
SC25_5C SWS Cal-G 25_5C Spectral responsivity for band 5C
SC25_5D SWS Cal-G 25_5D Spectral responsivity for band 5D
SC25_6 SWS Cal-G 25_6 Spectral responsivity for band 6

Some of these files have identical formats and so are discussed together.

In all cases the ISO Data Product Document  should be referred to for the exact file layout.

9.5.1 SWS Cal-G 1 Electrical crosstalk matrices

 

This file is used in Derive-SPD to correct for the effects of electrical crosstalk  (see section 8.2.6).

The file contains 12 records, each 52 integers in length. The first 12 numbers in each record contain the crosstalk for band 1, the next 12 for band 2 etc. Record 1 contains the crosstalk between detector 1 in each band and the other detectors in that band, record 2 contains the crosstalk between detector 2 in each band and the other detectors in that band, etc. Only records 1 and 2 contain information for bands 5 and 6 (the FP bands with only 2 detectors in each).

9.5.2 SWS Cal-G 2 RC correction timescales

 

This file, used in Derive-SPD, contains the time constants for the high pass filter in the amplifier chain (see section 8.2.5). It contains 52 numbers, the timescales per detectors in seconds.

9.5.3 SWS Cal-G 2A Midbit values

 

This file, used in Derive-SPD, contains the midbit value for each detector (see section 8.2.3). The detector readouts are between 0 and 4095 (bits) corresponding to -10 to 10 Volts. The midbit is the bit value that corresponds to 0 Volts, approximately 2048, and is different for each detector.

Currently this calfile is filled with 2047.50.

9.5.4 SWS Cal-G 2B Shape correction values

 

This is used in Derive-SPD. After the slope has been corrected for the reset pulse it is not straight. This files contains values to correct it, see section 8.2.4.

Currently this calfile is filled with zeros which results in the OLP chain not correcting for reset pulse shape.

9.5.5 SWS Cal-G 3 Reset cutout lengths

 

This file, used in Derive-SPD and Auto-Analysis, contains the number of 24Hz readouts to ignore after a reset (short circuit of the capacitor) (see section 8.2.2). It contains 52 numbers, the number of readouts to ignore per detector.

9.5.6 SWS Cal-G 4 Amplifier limits

 

This file, used in Derive-SPD, contains the SWS amplifier limits, the minimum and maximum allowable voltages from the amplifiers (see section 8.2.2). There are 52 records, each of which contains the minimum and maximum voltages for the three gains (gain 1, 4 and 16), in telemetry units.

9.5.7 SWS Cal-G 5 Switchable gains

 

This file, used in Derive-SPD, contains the gains used to convert between the slopes generated from the 24Hz information and the voltages on the detectors (see section 8.2.10). There are 52 records, one per detector. Each record contains three numbers, one for each gain.

9.5.8 SWS Cal-G 6 Glitch reject levels

 

This file, used in Derive-SPD, contains information used to recognise glitches  and reject them (see section 8.2.7). It contains 52 records, one per detector. Each record contains four numbers: tex2html_wrap_inline7399 ; the number of readouts to ignore before and after a glitch; and the minimum width of a glitch. The last three are in units of 24 Hz samples.

9.5.9 SWS Cal-G 7 Grating detector noise characteristics

 

Currently not used.

9.5.10 SWS Cal-G 8 Grating calibration specifications

 

Currently not used.

9.5.11 SWS Cal-G 9 LVDT-Angle relation

 

Currently not used.

9.5.12 SWS Cal-G 10 Key wavelengths

   

Currently not used.

9.5.13 SWS Cal-G 11 FP calibration spectrum

 

Currently not used.

9.5.14 SWS Cal-G 12 Gap-position relation

 

This file, used in Derive-SPD, contains information on the gap, current and position relationship of the two FPs (see sections 8.2.13 and 7.5). Each record contains the FP position (a telemetered number) applicable to both FPs, and then for each FP the main current and two correction currents necessary to achieve this position, and then the corresponding gap for those currents, in tex2html_wrap_inline6866 .

9.5.15 SWS Cal-G 13 Relative flux

 

This file, used in Auto-Analysis, contains information used in the flux calibration. There is one row per key wavelength . Each row has the name of the AOT band, the key wavelength, two numbers defining the passband used. Then come conversion numbers for each detector in that band (by default 12, with 10 blank for FP bands) in tex2html_wrap_inline8386 , then 12 internal calibration signals (in tex2html_wrap_inline6860 ), then 12 relative flux calibrations (in Jy), then errors on the conversion numbers (in tex2html_wrap_inline8386 ), errors on the internal calibrations (in tex2html_wrap_inline6860 ), errors on the relative flux calibrations (Jy) and finally the grating start and end position.

9.5.16 SWS Cal-G 14 Intensity of internal calibration sources

 

Currently not used.

9.5.17 SWS Cal-G 15 Intensity of calibration sources

 

Currently not used.

9.5.18 SWS Cal-G 16A Aperture offsets

   

This file, used in Derive-SPD, contains the angles, in degrees, from the optical axis  to the entrance or light source used, as seen from the SW and LW collimators (see section 7.5).

9.5.19 SWS Cal-G 16B Element offsets

 

This file, used in Derive-SPD, contains the angles, in degrees, from the optical axis to the detectors for each of the detectors (see section 7.5).

9.5.20 SWS Cal-G 16C Grating constants

   

This file, used in Derive-SPD, contains two grating constants, in tex2html_wrap_inline6866 , for the SW and LW gratings (see section 7.5).

9.5.21 SWS Cal-G 16D Telescope area

 

Currently not used.

9.5.22 SWS Cal-G 16E Scanner curve coefficients

 

This file, used in Derive-SPD, contains the scanner curve coefficients (see section 7.5).

9.5.23 SWS Cal-G 18 Effective gap correction

 

This file, used in Derive-SPD, contains information of the effective gap correction. For each possible FP wavelength there is a gap correction for each of the two FPs. All units are tex2html_wrap_inline6866 .

9.5.24 SWS Cal-G 19 AOT 1 resolution factors

   

Cal-G 19 is used in the processing of all speed AOT 1's . It contains the factors needed to smooth the RSRF's of each AOT band down to the spectral resolution  of the AOT 1 being processed and hence match the resolutions.

This was added in OLP V5.0 but the file was described incorrectly in the SWS IDUM V3.0.

9.5.25 SWS Cal-G 20 Relative detector responsivity

 

Currently not used.

9.5.26 SWS Cal-G 21_x Detector dark current/noise for x sec reset

     

These 4 files, Cal-G 21_1, Cal-G 21_2, Cal-G 21_4 and Cal-G 21_8 contain information on the dark current. There is one file per reset interval. Each file contains 52 records, each containing the detector number, the average measured dark current (from ground and PV phase tests). the noise in the dark current and finally the minimum and maximum valid dark currents. Dark currents are measured in tex2html_wrap_inline6860 .

9.5.27 SWS Cal-G 22 Detector response to internal diffuse source

 

Currently not used.

9.5.28 SWS Cal-G 23 Wave limits for bands

 

This file, used in Derive-SPD, contains information on the wavelength limits for the AOT bands. There is one row for each band, and each row contains the lower and upper wavelength limits in tex2html_wrap_inline6866 .

9.5.29 SWS Cal-G 24 Wave limits for apertures

 

This file, used in Derive-SPD, contains information on the wavelength limits for the three apertures. There are three rows, one row for each aperture, and each row contains the lower and upper limit wavelength limit for the two subsystems, in tex2html_wrap_inline6866 .

9.5.30 SWS Cal-G 25_x Spectral responsivity for band x

 

These files, Cal-G 25_1A, Cal-G 25_1B, Cal-G 25_1D, Cal-G 25_1E, Cal-G 25_2A, Cal-G 25_2B, Cal-G 25_2C, Cal-G 25_3A, Cal-G 25_3C, Cal-G 25_3D, Cal-G 25_3E, Cal-G 25_4, Cal-G 25_5A, Cal-G 25_5B, Cal-G 25_5C, Cal-G 25_5D and Cal-G 25_6, contain the spectral responsivity information (RSRF ) for each band.

Each is composed of the number of detectors in that band (twelve for grating, two for the FP files Cal-G 25_x and 25_6) times three numbers. These are the wavelength at which the responsivity is measured (in tex2html_wrap_inline6866 ), the responsivity and the error on it, both in tex2html_wrap_inline8386 .


next up previous contents index
Next: 10 Products sorted by Up: 9 Product Description Previous: 9.4 Auto-Analysis Results (AAR)

K. Leech with contributions from
the SWS Instrument Dedicated Team (SIDT)
and the SWS Instrument Support Team (SIST)