Thermal Evolved Gas Analyzer (TEGA) data sets

Data Set Overview

The Thermal Evolved Gas Analyzer (TEGA) is designed to analyze ~50 mg of fine grained Martian soil or rock fragments. TEGA consists of four basic components: a soil delivery system, an oven/calorimeter thermal analyzer (TA), a gas storage and handling system, and a mass spectrometer acting as an evolved-gas analyzer (EGA). A full description of the TEGA instrument can be found in [BOYNTONETAL2008].

The data set PHX MARS THERMAL EVOLVED GAS ANALYZER 1 EDR is a time series collection of TA, EGA, engineering, and commanding measurements from the TEGA aboard the Mars Phoenix Lander. Data types included in this data set are engineering data, calorimeter data from the TA,sweep mode EGA data, mass hopping mode EGA data, LED oven fill data, and instrument message log data. Data are sorted by time, with each data file containing one measurement day's worth of data from midnight to midnight UTC.

TEGA is designed to analyze 8 individual samples, one sample in each of the eight single use ovens. The EGA portion of the instrument will not only analyze the gases evolved from the samples heated in the ovens, but will also analyzed samples of the Martian atmosphere. TEGA is expected to operate for 45 days. During operations the science, engineering and housekeeping data are downloaded from the spacecraft by the Jet Propulsion Laboratory (JPL) into the Telemetry Data System (TDS). The TDS sends data to a process that translates data packets and examines instrument health via messages. Data are output to a spooler that passes them to the University of Arizona (UA) database ingest process. The ingest process inputs raw data into the UA database. Data are retrieved from the UA database to build the TEGA EDR data products.

The TEGA EDR data set is intended to be the lowest level (level 0) data available for TEGA. It should be useful to those scientists who are experienced in calorimetry and mass spectrometry.

Parameters

The TEGA EDR data set is composed of three main data types and three supporting data types. The objective of compiling the TEGA EDR is to create a record of the primary data collected by TEGA. The following paragraphs discuss the parameters of interest in each of the data types.

SC DATA

The SC data are time series records taken over the course of a measurement day. Data files are labeled with the date. Individual records are a single data collection interval. SC data are the science data produced by the TA.

EGA DATA

The EGA data are time series records taken over the course of a measurement day. Data files are labeled with the date. Individual records are a single data collection interval. EGA data are the science data produced by the EGA mass spectrometer in sweep mode.

EGH DATA

The EGH data are time series records taken over the course of a measurement day. Data files are labeled with the date. Individual records are a single data collection interval. EGH data are the science data produced by the EGA mass spectrometer in mass hopping mode.

The Engineering, LED fill and Message Log, data sets provide supporting information.

Engineering Data

The Engineering data are time series records for each engineering parameter taken over the course of a measurement day. Data files are grouped in the ENG folder and are labeled with the engineering parameter name. Individual records are a single data collection interval that is variable in duration. Engineering values are reported by parameter name and include collection time, and DN value. Engineering values are specific monitor values recorded by TEGA.

Message Log

The Message Log data are time series records taken over the course of a day. Data files are labeled with the date. Individual records are a single data collection interval. The Message Log data are messages returned from TEGA.

LED

LED data are time series records taken over the course of a measurement day. Data files are labeled with the date. Individual records are a single data collection interval, which is variable in duration. The LED data are the data collected by the oven fill sensors, and indicate when an oven is full of sample material.

Processing

TEGA data (both science and engineering) are downloaded from the Phoenix Mars Lander by JPL into the Telemetry Data System (TDS). The TDS sends the data to a process called TEGA_tl, that translates GRS packets from any source to any destination and examines instrument health via messages. The data are checked for packet types, header information, messages, or errors. Data are output to a spooler, which passes data to the UA database ingestion process. The ingestion process inputs raw telemetry data into the database.

A function reads the data header to get the total number of bytes in the packet, and the sequence bytes. The rest of the packet is then read. The data type, read from the common header, is returned, determining the next step in the processing. One of a number of different procedures is run to insert packet data into the appropriate database tables. If the data type returned is less than or equal to 0 an error message is returned stating that the packet was not inserted. Once all data packets for a measurement day are ingested into the database, the EDR data products are created by reformatting the raw data in accordance with the data formats specified by the product labels.

Data

The TEGA EDR data set is composed of a series of date stamped files that contain 1 day's worth (24 hours, 00:00:00 UTC to 23:59:59 UTC) of data for 6 different data types. The following sections describe each data type.

SC DATA

SC data are composed of raw scanning calorimeter data. These data include start and end time of collection, oven and shield power, and associated current, potential, and pulse data.

EGA DATA

EGA mass spectrometer data is composed of start and stop times of the collection, scan type, voltage, emission energy and counts at each of four collectors.

EGH DATA

EGH data are mass hopping mode EGA data. These data include start and stop times for the collection, voltage, emission energy and level, and counts at the detector.

Engineering Data

Engineering data are composed of the 85 different engineering readings monitored in TEGA. The engineering readings can be taken at several different time intervals. The following is a list of all the engineering readings and a description of each.

TA_MANIFOLD_PRES	Manifold Pressure
TA_PLUS_5_VREF	+5V REF
TA_OUTLET_PRES	Outlet Pressure
TA_MANIFOLD_TEMP	TA Manifold Temperature
TA_EGA_PLUMB_TEMP	MS Plumbing Temperature
TA_EGA_BAKEOUT_TEMP	Bakeout temperature
TA_PLUMBING_1_TEMP	Plumbing 1 Temperature
TA_PLUMBING_2_TEMP	Plumbing 2 Temperature
TA_EGA_MAN_TEMP	MS Manifold Temperature
TA_CAL_TANK_TEMP	Cal Tank Temperature
TA_CPU_TEMP	CPU Temperature
TA_PWR_SPLY_1_TEMP	Power Supply 1 Temperature
TA_PWR_SPLY_2_TEMP	Power Supply 2 Temperature
TA_PWR_CNTL_1_TEMP	Power Control 1 Temperature
TA_PWR_CNTL_2_TEMP	Power Control 2 Temperature
TA_A2D_TEMP	ADC Temperature
TA_COVER_1_TEMP	cover 1 temperature
TA_INPUT_FUNNEL_1_LO_	TEMP Funnel 1 Temperature
TA_PRES_SENSE_FD_BK	Pres Sense Exc. Feedback
TA_INPUT_FUNNEL_2_LO_TEMP	Funnel 2 Temperature
TA_OVEN_TEMP	Oven Temperature
TA_SHLD_TEMP	Shield Temperature
TA_EGA_ELECT_BOX_TEMP	TEB Temperature
TA_T_HEATER_TEMP	'T' Heater Temperature
TA_TRANS_TUBE_TEMP	Transfer Tube Temperature
TA_EGA_GEC_TEMP	GEC Temperature
TA_BUS_A_VOLT	Bus A Voltage
TA_AGD_0_1	AGD_0_3 ground
TA_AGD_3_1	AGD_3_1 ground
TA_CPU_PLUS_5_VOLT	CPU Voltage
TA_ANLG_PLUS_12_VOLT	Analog +12V Voltage
TA_ANLG_MINUS_12_VOLT	Analog -12V Voltage
TA_OVEN_PLUS_15_VOLT	Oven Voltage
TA_SHIELD_PLUS_30_VOLT	Shield Voltage
TA_BUS_A_CUR	Bus A Current
TA_BUS_B_CUR	Bus B Current
TA_EGA_CUR	EGA Current
TA_CPU_PLUS_5_CUR	CPU Current
TA_ANLG_PLUS_12_CUR	Analog +12V Current
TA_ANLG_MINUS_12_CUR	Analog -12V Current
TA_OVEN_PLUS_15_CUR	Oven Current
TA_SHIELD_PLUS_30_CUR	Shield Current
TA_FULL_DETECT	Full Detect Integrated
TA_FULL_DETECT_RAW	Full Detect Raw
TA_OVEN_ERR	Oven Error
TA_SHLD_ERR	Shield Error
TA_CAL_TANK_COLD_TEMP	Cal Tank Cold Temperature
TA_COVER_2_TEMP	cover 2 Temperature
MEM_OVEN_INT_LO	Oven integrator val lo bytes
MEM_OVEN_INT_HI	Oven integrator val hi bytes
MEM_SHLD_INT_LO	Shield integrator val lo bytes
MEM_SHLD_INT_HI	Shield integrator val hi bytes
MEM_OVEN_VOLT	Oven voltage
MEM_OVEN_CUR	Oven current
MEM_SHLD_VOLT	Shield voltage
MEM_SHLD_CUR	Shield current
MEM_MANIFOLD_PRES	Manifold pressure
MEM_OVEN_ERR	Oven error
MEM_SHLD_ERR	Shield error
MEM_T_WIDTH	T pulse width
COVER1_DONE	Cover1 Limit Switch
COVER2_DONE	Cover2 Limit Switch
MEM_OVEN_WIDTH	Oven pulse width
MEM_SHLD_WIDTH	Shield pulse width
EGA_STATUS_BITS	Status bits value
EGA_TRAP_CUR	Trap current monitor
EGA_EMISSION_CUR	Emission current monitor
EGA_FILAMENT_1	Filament 1 in use
EGA_FILAMENT_2	Filament 2 in use
EGA_PLUS_5_VOLT	+5 volt monitor
EGA_PLUS_12_VOLT	+12 volt monitor
EGA_MINUS_12_VOLT	-12 volt monitor
EGA_FILAMENT_CUR_1	Filament 1 current monitor
EGA_FILAMENT_CUR_2	Filament 2 current monitor
EGA_MULTIPLIER_VOLT	Multiplier voltage monitor
EGA_ION_PUMP_VOLT	Ion Pump voltage monitor
EGA_ION_PUMP_CUR	Ion Pump Current monitor
EGA_SWEEP_VOLT	Sweep voltage monitor
EGA_GEC_CUR	GEC current monitor
EGA_MAGNET_TEMP_1	Magnet 1 temperature
EGA_MAGNET_TEMP_2	Magnet 2 temperature
EGA_PROC_TEMP	CPU temperature
EGA_AVG_CALLS	Average # calls to Task Queue
EGA_MIN_CALLS	Minimum # calls to Task Queue
EGA_SPARE_3	Spare
EGA_SPARE_4	Spare

Message Log

The Message Log data consists of the data sent from the TEGA electronics in response to some action taking place in the instrument. The message data includes general messages and warnings as well as error messages.

LED DATA

The LED data consists of the time of the LED reading and the state of the sensor. This data is used to indicate when an oven is full of sample.

Ancillary Data

Ancillary data are listed by data type.

Message Log

A list of all message ID's and their associated meanings can be found in the Message Log label file. A list of message detail ID's and the associated information can be found in the tega_message_dict document located in the document directory.

Coordinate System

Several coordinate systems are used by the Phoenix project. A detailed description can be found in the TEGA EDR SIS document found in the Documents directory.

Software

No TEGA specific software is provided with this data set. PDS-labeled images and tables can be viewed with the program NASAView, developed by the PDS and available for a variety of computer platforms from the PDS web site http://pds.nasa.gov/tools/software_download.cfm. There is no charge for NASAView.

Media/Format

The TEGA EDR will be delivered using DVD media. Formats will be based on standards for such products established by the Planetary Data System (PDS) [PDSSR2001].

Confidence Level Overview

The data presented in the TEGA EDR is intended to be the least processed, most primitive data set released for TEGA. Data presented here are an accurate representation of TEGA data as received from the spacecraft.

Review

The TEGA EDR was reviewed internally by the TEGA team prior to release to the PDS. PDS will also performed an external peer review of the TEGA EDR.

Data Coverage and Quality

Data reported are the minimally processed data received from the lander during nominal TEGA operations. All data received is reformatted into one of the EDR data types. Data are by definition of good quality, as damaged telemetry packets are sequestered upon receipt from the lander. We do not expect to receive many (if any)) damaged data packets.

Limitations

The major limitation of this data set is that this is level 0, minimally processed data. The data are received from the spacecraft telemetry and ingested into a database. If gaps exist in the telemetry, data are lost.

Data Compression

No data compression is used.

Data Set Overview

The Thermal Evolved Gas Analyzer (TEGA) is designed to analyze ~50 mg of fine grained Martian soil or rock fragments. TEGA consists of four basic components: a soil delivery system, an oven/calorimeter thermal analyzer (TA), a gas storage and handling system, and a mass spectrometer acting as an evolved-gas analyzer (EGA). A full description of the TEGA instrument can be found in [BOYNTONETAL2008].

The data set PHX MARS THERMAL EVOLVED GAS ANALYZER 3 RDR is a time series collection of TA, EGA, engineering, and commanding measurements from the TEGA aboard the Mars Phoenix Lander. The RDR data are converted from the EDR raw values to scientifically useful data including physical units. Data types included in this data set are engineering data, calorimeter data from the TA, sweep mode EGA data, and mass hopping mode EGA data. Data are sorted by time, with each data file containing one measurement day's worth of data from midnight to midnight UTC.

TEGA is designed to analyze 8 individual Martian regolith samples, one sample in each of the eight single use ovens. The EGA portion of the instrument will not only analyze the gases evolved from the samples heated in the ovens, but will also analyzed samples of the Martian atmosphere.

TEGA is expected to operate for 45 days. During operations science, engineering and housekeeping data are downloaded from the lander by the Jet Propulsion Laboratory (JPL) into the Telemetry Data System (TDS). The TDS sends data to a process that translates data packets and examines instrument health via messages. Data are output to a spooler that passes them to the University of Arizona (UA) database ingest process. The ingest process inputs raw data into the UA database. Data are retrieved from the UA database to build the TEGA RDR data products.

The TEGA RDR data set is intended to be the first reduced data product for the TEGA instrument. It should be useful to those scientists who are experienced in calorimetry and mass spectrometry.

Parameters

The TEGA RDR data set is composed four data types. The objective of compiling the TEGA RDR is to create a record of of data that has been converted to scientifically useful physical units and has been combined with useful calibration information. The following paragraphs discuss the parameters of interest in each of the data types.

SCRDR

The SC data are time series records taken over the course of a measurement day. Data files are labeled with the date. Individual records are a single data collection interval. SC data are the science data produced by the TA.

EGSRDR

The EGA data are time series records taken over the course of a measurement day. Data files are labeled with the date. Individual records are a single data collection interval. EGA data are the science data produced by the EGA mass spectrometer in sweep mode.

EGHRDR

The EGH data are time series records taken over the course of a measurement day. Data files are labeled with the date. Individual records are a single data collection interval. EGH data are the science data produced by the EGA mass spectrometer in mass hopping mode.

ENGRDR

The Engineering data are time series records for each engineering parameter taken over the course of a measurement day. Data files are grouped in the ENG folder and are labeled with the engineering parameter name. Individual records are a single data collection interval that is variable in duration. Engineering values are reported by parameter name and include collection time, and parameter value. In general, temperatures are reported in Celsius, currents in milliamps, and potentials in volts. The ENGRDR label file is the definitive source for the units of measure. Engineering values are specific monitor values recorded by TEGA.

Processing

TEGA data (both science and engineering) are downloaded from the Phoenix Mars Lander by JPL into the Telemetry Data System (TDS). The TDS sends the data to a process called TEGA_tl, that translates GRS packets from any source to any destination and examines instrument health via messages. The data are checked for packet types, header information, messages, or errors. Data are output to a spooler, which passes data to the UA database ingestion process. The ingestion process inputs raw telemetry data into the database. A function reads the data header to get the total number of bytes in the packet, and the sequence bytes. The rest of the packet is then read. The data type, read from the common header, is returned, determining the next step in the processing. One of a number of different procedures is run to insert packet data into the appropriate database tables. If the data type returned is less than or equal to 0 an error message is returned stating that the packet was not inserted. The initialization of the ingestion process also sets up the necessary connections to the SPICE kernel information (Navigation and Ancillary Information Facility (NAIF) system designed to provide scientists with ancillary observation geometry data useful in interpretation of science instrument observations returned from planetary spacecraft), the database, and the input data. The appropriate SPICE kernels are loaded and opened, and a connection is initiated with the database. SPICE kernels are used to compute the local solar time of the measurements from the spacecraft or instrument clock times. As engineering values are entered into the database, stored database procedures are called to convert raw engineering DN values into physical units. The raw DN values are converted using stored polynomials unique to each engineering parameter. The polynomials were derived through hardware calibrations, see the TEGA RDR SIS Appendix 7.3 for a table of the engineering conversions.

Data

The TEGA RDR data set is composed of a series of date stamped files that contain 1 day's worth (24 hours, 00:00:00 UTC to 23:59:59 UTC) of data for 4 different data types. The following sections describe each data type.

SCRDR

SC data are composed of scanning calorimeter data. These data are composed of data collection time and oven and shield temperature and duty cycle data.

EGSRDR

EGSRDR data are mass spectrometer data collected in sweep mode. These data are composed of timing, mass spectrometer emission, temperature and voltage parameters, as well as detector counts at each of the four detectors.

EGHRDR

EGHRDR data are mass hopping mode EGA data. These data include start and stop times for the collection, voltage, emission energy and level, and counts at the detector.

ENGRDR

Engineering data are composed of the 84 different engineering readings monitored in TEGA. ENGRDR data is composed of collection time information and engineering value. The following is a list of all the engineering readings and a description of each.

TA_MANIFOLD_PRES	Manifold Pressure
TA_PLUS_5_VREF	+5V REF
TA_OUTLET_PRES	Outlet Pressure
TA_MANIFOLD_TEMP	TA Manifold Temperature
TA_EGA_PLUMB_TEMP	MS Plumbing Temperature
TA_EGA_BAKEOUT_TEMP	Bakeout temperature
TA_PLUMBING_1_TEMP	Plumbing 1 Temperature
TA_PLUMBING_2_TEMP	Plumbing 2 Temperature
TA_EGA_MAN_TEMP	MS Manifold Temperature
TA_CAL_TANK_TEMP	Cal Tank Temperature
TA_CPU_TEMP	CPU Temperature
TA_PWR_SPLY_1_TEMP	Power Supply 1 Temperature
TA_PWR_SPLY_2_TEMP	Power Supply 2 Temperature
TA_PWR_CNTL_1_TEMP	Power Control 1 Temperature
TA_PWR_CNTL_2_TEMP	Power Control 2 Temperature
TA_A2D_TEMP	ADC Temperature
TA_COVER_1_TEMP	cover 1 temperature
TA_INPUT_FUNNEL_1_LO_	TEMP Funnel 1 Temperature
TA_PRES_SENSE_FD_BK	Pres Sense Exc. Feedback
TA_INPUT_FUNNEL_2_LO_TEMP	Funnel 2 Temperature
TA_OVEN_TEMP	Oven Temperature
TA_SHLD_TEMP	Shield Temperature
TA_EGA_ELECT_BOX_TEMP	TEB Temperature
TA_T_HEATER_TEMP	'T' Heater Temperature
TA_TRANS_TUBE_TEMP	Transfer Tube Temperature
TA_EGA_GEC_TEMP	GEC Temperature
TA_BUS_A_VOLT	Bus A Voltage
TA_AGD_0_1	AGD_0_3 ground
TA_AGD_3_1	AGD_3_1 ground
TA_CPU_PLUS_5_VOLT	CPU Voltage
TA_ANLG_PLUS_12_VOLT	Analog +12V Voltage
TA_ANLG_MINUS_12_VOLT	Analog -12V Voltage
TA_OVEN_PLUS_15_VOLT	Oven Voltage
TA_SHIELD_PLUS_30_VOLT	Shield Voltage
TA_BUS_A_CUR	Bus A Current
TA_BUS_B_CUR	Bus B Current
TA_EGA_CUR	EGA Current
TA_CPU_PLUS_5_CUR	CPU Current
TA_ANLG_PLUS_12_CUR	Analog +12V Current
TA_ANLG_MINUS_12_CUR	Analog -12V Current
TA_OVEN_PLUS_15_CUR	Oven Current
TA_SHIELD_PLUS_30_CUR	Shield Current
TA_FULL_DETECT	Full Detect Integrated
TA_FULL_DETECT_RAW	Full Detect Raw
TA_OVEN_ERR	Oven Error
TA_SHLD_ERR	Shield Error
TA_CAL_TANK_COLD_TEMP	Cal Tank Cold Temperature
TA_COVER_2_TEMP	cover 2 Temperature
MEM_OVEN_INT_LO	Oven integrator val lo bytes
MEM_OVEN_INT_HI	Oven integrator val hi bytes
MEM_SHLD_INT_LO	Shield integrator val lo bytes
MEM_SHLD_INT_HI	Shield integrator val hi bytes
MEM_OVEN_VOLT	Oven voltage
MEM_OVEN_CUR	Oven current
MEM_SHLD_VOLT	Shield voltage
MEM_SHLD_CUR	Shield current
MEM_MANIFOLD_PRES	Manifold pressure
MEM_OVEN_ERR	Oven error
MEM_SHLD_ERR	Shield error
MEM_T_WIDTH	T pulse width
COVER1_DONE	Cover1 Limit Switch
COVER2_DONE	Cover2 Limit Switch
MEM_OVEN_WIDTH	Oven pulse width
MEM_SHLD_WIDTH	Shield pulse width
EGA_STATUS_BITS	Status bits value
EGA_TRAP_CUR	Trap current monitor
EGA_EMISSION_CUR	Emission current monitor
EGA_FILAMENT_1	Filament 1 in use
EGA_FILAMENT_2	Filament 2 in use
EGA_PLUS_5_VOLT	+5 volt monitor
EGA_PLUS_12_VOLT	+12 volt monitor
EGA_MINUS_12_VOLT	-12 volt monitor
EGA_FILAMENT_CUR_1	Filament 1 current monitor
EGA_FILAMENT_CUR_2	Filament 2 current monitor
EGA_MULTIPLIER_VOLT	Multiplier voltage monitor
EGA_ION_PUMP_VOLT	Ion Pump voltage monitor
EGA_ION_PUMP_CUR	Ion Pump Current monitor
EGA_SWEEP_VOLT	Sweep voltage monitor
EGA_GEC_CUR	GEC current monitor
EGA_MAGNET_TEMP_1	Magnet 1 temperature
EGA_MAGNET_TEMP_2	Magnet 2 temperature
EGA_PROC_TEMP	CPU temperature
EGA_AVG_CALLS	Average # calls to Task Queue
EGA_MIN_CALLS	Minimum # calls to Task Queue
EGA_SPARE_3	Spare
EGA_SPARE_4	Spare

Ancillary Data

No ancillary data are included with this data set.

Coordinate System

Several coordinate systems are used by the Phoenix project. A detailed description can be found in the TEGA RDR SIS document found in the Documents directory.

Software

No TEGA specific software is provided with this data set. PDS-labeled images and tables can be viewed with the program NASAView, developed by the PDS and available for a variety of computer platforms from the PDS web site http://pds.nasa.gov/tools/software_download.cfm. There is no charge for NASAView.

Media/Format

The TEGA RDR will be delivered using DVD media. Formats will be based on standards for such products established by the Planetary Data System (PDS) [PDSSR2001].

Confidence Level Overview

The data presented in the TEGA RDR is processed for engineering units and combined with converted timing. Accuracy of the data presented here is dependent on appropriate use of SPICE and pre-flight calibration data for engineering unit conversions.

Review

The TEGA RDR was reviewed internally by the TEGA team prior to release to the PDS. PDS will also performed an external peer review of the TEGA RDR.

Data Coverage and Quality

Data reported are derived from the minimally processed data received from the lander during nominal TEGA operations. All data received is reformatted into one of the EDR data types. RDR data is produced from the EDR data set, which by definition is of good quality.

Limitations

The RDR data set is limited by any errors in the EDR data set.

Data Compression

No data compression is used.