PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2000-06-13 NOTE = " NIS Data File parameter Definitions " END_OBJECT = TEXT END NEAR INFRARED SPECTROMETER SCIENCE RECORD VARIABLES (Binary Table Fields) The following list of variable names are contained in the header of the Binary table extension of the NIS data file created by CFITSIO user routines for PDS compliance. The corresponding definitions will be placed in a separate file and will not be contained in the PDS label file, or require the generatio of PDS keywords. 1. met minimum value - 0 maximum value - 160000000 units - seconds (unsigned) definition - Mission Elapsed Time in seconds for the start of this XGRS integration period 2. tdb minimum value - -1.3e+8 maximum value - +6.4e+7 units - seconds (signed) definition - Barycentric Dynamical Time corresponding to MET(1). Barycentric Dynamical Time (TDB) is the independent variable in the equations, including terms for relativity, of motion of the celestial bodies. The solution of these equations gives the rectangular coordinates of those bodies relative to the barycentre (centre of mass) of the solar system. (The barycentre does not coincide with the centre of the Sun but is displaced to a point near its surface in the direction of Jupiter.) 3. dqi minimum value - N/A maximum value - N/A units - N/A definition - Data Quality Index c0 = Data Quality Flag[0=good,1=flagged for quality defects] c1 = Instrument number for FC, CTP and AIU[1 or 2] c2 - c6 = Processing Flags not quality related c7 = CCDS Source[0=VC0, 1=VC1, 2=VC2, 3=VC3] 4. spectrometer_on_off minimum value - 0 maximum value - 1 units - N/A definition - NIS electronics power on/off - turn the power to the NIS electronics on or off. The DPU turns on the spectrometer power when it starts up via a discrete which controls a solid state relay. The entire NIS interface becomes operational within 1-2 seconds after power is applied. Turning off the spectrometer zeros the SSG control word. cmd opcode: 0fx400 ground conversion: 0=off 1=on initial value: 1=on 5. scan_mirror_drive_select minimum value - 0 maximum value - 1 units - N/A definition - scan mirror drive select - Select the primary or secondar drive for subsequent scan mirror motions. The default is the primary drive. Note: the mirror is allowed to spring to its fully forward position before changing the drive; the "Home scan mirror" should be issued after this command. cmd opcode: 0fx402 ground conversion: 0=primary 1=secondary initial value: 0=primary 6. shutter_drive_select minimum value - 0 maximum value - 1 units - N/A definition - shutter drive select - select the primary or secondary drive for subsequent shutter drive motions. The default is the primary drive. cmd opcode: 0fx405 ground conversion: 0=primary 1=secondary initial value: 0=primary 7. slit_drive_select minimum value - 0 maximum value - 1 units - N/A definition - slit plate drive select - select the primary or secondary drive for subsequent shutter slit plate motions. The default is the primary drive. cmd opcode: 0fx406 ground conversion: 0=primary 1=secondary initial value: 0=primary 8. slit shutter position minimum value - 0 maximum value - 3 units - N/A definition - slit/shutter in/out - move the slit and shutter to the desired position. The default is both the slit and shutter out. cmd opcode: 0fx407 ground conversion: 0=both out 1=slit only 2= shutter only 3=both in initial value: 0=both out 9. ge_detector_gain minimum value - 0 maximum value - 1 units - N/A definition - Ge detector gain adjust - set the gain of the Ge detector The default is 1x. cmd opcode: 0fx408 ground conversion: 0=1x 1=10x initial value: 0=1x 10. spare1 minimum value - N/A maximum value - N/A units - N/A definition - spare 11. ssg_telltales minimum value - 0 maximum value - 255 units - N/A definition - SSG telltales - include protective cover indicator, slit and shutter position indicators, and the "start" and "nadir" discrete fiducials. cover closed bit 0,0=closed cover open bit 1,0=open slit in bit 2,0=in slit out bit 3,0=out shutter in bit 4,0=in shutter out bit 5,0=out mirror start bit 6,1=active mirror nadir bit 7,1=active 12. motor_move_volt minimum value - 0 maximum value - 1 units - N/A definition - motor move voltage - set the voltage used to move the mirror, slit, or shutter. The default is 15V (to save power). cmd opcode: 0fx410 ground conversion: 0=15V 1=20V initial value: 0=15V 13. spare2 minimum value - N/A maximum value - N/A units - N/A definition - spare 14. sequence_aborted minimum value - 0 maximum value - 1 units - N/A definition - Sequence aborted during acquisition. 0=no abort 1=sequence abort 15. commanded_scan_mirror_pos minimum value - 0 maximum value - 350 units - N/A definition - Position of scan mirror. Mirror has 351 steps in 0.2 degree rotation steps. Sequences to mirror define a starting position, and the sequence can increment the mirror by some number each observation. 16. number_of_spectra minimum value - 0 maximum value - 63 units - N/A definition - Number of spectra summed during each observation. Each spectrum is a one second integration of data in the detectors. up to 6 seconds can be summed and saved as a single spectrum. 17. actual_scan_mirror_pos minimum value - 0 maximum value - 350 units - N/A definition - Actual position of scan mirror during observation. An error exists if this parameter is not the same as commanded_scan_mirror_pos. 18. current_sequence minimum value - 0 maximum value - 15 units - N/A definition - current spectrometer sequence - number of the current spectrometer sequence. Fifteen sequence definitions can b held in the NIS while it is on. Sequence number s 0,1, and 2 are hard-coded and are defined automatically when the instrument is turned on, but they can be subsequently redefined like the rest of the sequences. 19. science_summary minimum value - 0 maximum value - 256 units - N/A definition - science summary - a science summary which indicates the basic health of the detector and interface hardware. The summary is the most significant eight bits of the brightest pixel of either the Ge or the InGaAs detectors. 20. ge_detector_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - Germanium detector temperature - Temperature at the detector itself. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: Ge detector temperatures have a caveat: only 8 bits of the 12 bit data are sent to the ground, with the 8 bits taken out of the middle. Therefore when the temperature reaches a maximum value the data rolls over and starts again near the minimum. If the scale isn't adjusted a temperature of just above -30C can appear as around -110C. 21. ge_inner_board_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - Germanium inner board temperature - One of two boards containing preamplifiers. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 22. ge_middle_board_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - Germanium middle board temperature - One of two boards containing preamplifiers. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 23. ingaas_detector_temp_1 minimum value - 0 maximum value - 2**8-1 units - N/A definition - Indium Gallium Arsenide detector temperature #1 - One of two measurements made at the detector itself. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 24. ingaas_detector_temp_2 minimum value - 0 maximum value - 2**8-1 units - N/A definition - Indium Gallium Arsenide detector temperature #2 - One of two measurements made at the detector itself. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 25. ingaas_inner_board_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - Indium Gallium Arsenide inner board temperature - One of two boards containing preamplifiers. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 26. ingaas_middle_board_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - Indium Gallium Arsenide middle board temperature - One of two boards containing preamplifiers. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 27. ssg_scan_motor_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - Sensor Systems Group scan motor temperature - A temperature measurement on the motor case of the scan motor. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 28. ssg_scan_mirror_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - Sensor Systems Group scan mirror temperature - Temperatur of the scan mirror itself. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 29. ssg_drive_board_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - Sensor Systems Group drive board temperature - Temperatur of the board in the support electronics for NIS. Not located inside the instrument proper, but in the support electronics which is mounted on the forward facing side of the aft deck (rather than the instrument which is on the aft facing side of the aft deck). Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 30. ssg_detector_base_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - Sensor Systems Group detector base temperature - The detector base is a temperature monitor on the housing structure in between where the two detectors mount to the housing. It is a housing temperature and not a detector temperature. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 31. nis_dc_dc_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - NIS DC/DC temperature - DC/DC power converter temperature Converters take spacecraft DC power (nominally 33 V or so) and convert it into the voltages needed by the instrument. The temperature of these units rise because they handle all the power of the instrument and are appreciably less than 100% efficient (the lost power becoming heat). Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 32. dpu_dc_dc_temp minimum value - 0 maximum value - 2**8-1 units - N/A definition - Data Processing Unit DC/DC power converter temperature. Temperatures are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to Degrees X is: 33. ssg_motor_current minimum value - 0 maximum value - 2**8-1 units - N/A definition - Sensor Systems Group motor current - Current provided to motor that dives the scan mirror. Current values are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to mAmps is: 34. nis_dc_dc_current minimum value - 0 maximum value - 2**8-1 units - N/A definition - NEAR Infrared Spectrometer DC/DC converter current. Current values are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to mAmps is: 35. ssg_dc_dc_current minimum value - 0 maximum value - 2**8-1 units - N/A definition - Sensor Systems Group DC/DC converter current. Current values are recorded as counts. Conversion of counts to engineering units is performed by the ground software. Equation for converting counts to mAmps is: 36. ge_spectra minimum value - 0 maximum value - 2**16-1 units - N/A definition - Germanium spectrum - the accumulation of counts from the Germanium detector at the end of every one second integration period. Each 16-bit spectrum is the accumulation of up to 63 12-bit spectra. Accumulations larger than 16 bits, "wrap around". 37. ingaas_spectra minimum value - 0 maximum value - 2**16-1 units - N/A definition - Indium Gallium Arsenide spectrum - the accumulation of counts from the Indium Gallium Arsenide detector at the end of every one second integration period. Each 16-bit spectrum is the accumulation of up to 63 12-bit spectra. Accumulations larger than 16 bits, "wrap around". ------------------------------------------------------------------------------