This file contains General Housekeeping data. The most important housekeeping data for an observer is the science housekeeping contained in frame 8. This contains information from the prime instrument.
The GEHK file contains a primary header with the fields described in Table D.23. In this example non-mandatory fields are filled with example values.
| Keyword | Value | Description |
| SIMPLE = | T | / |
| BITPIX = | 8 | / |
| NAXIS = | 0 | / |
| EXTEND = | T | / |
| ORIGIN = | 'ESA ' | / European Space Agency |
| TELESCOP = | 'ISO ' | / Infrared Space Observatory |
| COMMENT | General HK | |
| FILENAME = | 'GEHK26400248' | / File name in ISO archive |
| DATE = | '09/07/95' | / Creation date |
| FILEVERS = | '0298 ' | / Version ID in ISO archive |
| OLPVERS = | 'OLP_21 ' | / SOC OLP system version |
| CALGVERS = | 'CALG_31 ' | / SOC OLP CAL-G files version |
| USERNAME = | 'PIPELINE' | / |
| VERS1 = | '0518/EOHA083' | / Version ID of each input file |
| VERS2 = | '0518/EOHI083' | / Version ID of each input file |
| VERS3 = | '0515/APPH083' | / Version ID of each input file |
| EQUINOX = | 2000.0 | / Equinox |
| TMRATE = | 32 | / Telemetry rate in Kbps (Kbits/sec) |
The GEHK file contains records described in Table D.24.
| Keyword | Number | Format | Description |
| GEPRTKEY | 1 | I4 | UTK time key |
GEPRQUAL |
1 | I4 | Frame quality |
| GEHKGST | 2 | I4 | GST in original TDF record |
GEHKFR0 |
256 | I1 | Frame 0 (spacecraft housekeeping) |
| GEHKFR8 | 256 | I1 | Frame 8 (science housekeeping) |
| GEHKFR16 |
256 | I1 | Frame 16 (spacecraft housekeeping) |
| GEHKRPID | 3 | I1 | Raster point ID and validity |
GEHKDERP |
509 | I1 | (ESOC's) derived parameters |
No useful information is kept here for CAM.
No useful information is kept here for LWS.
No useful information is kept here for PHT.
Table D.25 describes the bits in frame 8 relevant to SWS. Bits are numbered from 0 (LSB) to 7 (MSB). Some of this information is copied over into the SWS status word SWSPSTAT (see the ISO Handbook Volume V on SWS, [108]).
| Check | Byte | Bit | Contents |
| Diffuse calibrator | 13 | 4 | If bit set then diffuse calibrator on |
| Grating calibrator | 13 | 4, 5 and 6 | If bit set then grating calibrator on |
| SW scan in AOT7 | 13 | 5 | If bit set then SW scan in AOT 7 |
| Grating scan | 13 | 5 and/or 6 | If bit set then grating scan |
| FP | 13 | 5, 6 and 7 | If bit set then FP on |
| Dark current | 48 | 0 | If bit set then dark current |
| Photometric check | 46 | 3 | If bit set then photometric check |
| SW grating run | 43 | 0 | If bit set then SW grating running |
| LW grating run | 52 | 0 | If bit set then LW grating running |
| SW scan direction | 43 | 7 | If bit set then SW scan |
| LW scan direction | 52 | 7 | If bit set then LW scan |