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Appendix E
Engineering Snapshots

Certain engineering parameters from the instruments, such as detector temperatures and voltages, were identified before launch as being necessary to process and calibrate science data. Engineering snapshots were, therefore, obtained at the beginning of an exposure and every 5 minutes thereafter, with a final one taken at the end of the exposure (Section 5.3). A brief description of the content of snapshot files is given below. More details can be found in the Instrument Handbook (2009).


Table E.1: Formats of snap/snpaf/snpbf Filesa
Array NameFormatDescription
HDU 1: Empty (Header only)
HDU 2: Time ordered data
I_UT_TIME_MJD double Snapshot time in MJD (days)
I_DET1ELTEMP double DET1 electronics temperature
I_DET1PLTEMP double DET1 Baseplate temperature
I_DET2ELTEMP double DET2 electronics temperature
I_DET2PLTEMP double DET2 Baseplate temperature
I_DET1XSCALEAST double DET1 segment A Time (X) image scale factor.
I_DET1XOFFSETAST double DET1 segment A Time (X) image postion offset.
I_DET1XSCALEBST double DET1 segment B Time (X) image scale factor.
I_DET1XOFFSETBST double DET1 segment B Time (X) image postion offset.
I_DET2XSCALEAST double DET2 segment A Time (X) image scale factor.
I_DET2XOFFSETAST double DET2 segment A Time (X) image postion offset.
I_DET2XSCALEBST double DET2 segment B Time (X) image scale factor.
I_DET2XOFFSETBST double DET2 segment B Time (X) image postion offset.
I_DET1TEMP double DET1 Detector temperature.
I_DET1HVMODLTEMP double DET1 High Voltage Module temperature.
I_DET1HVFLTRTEMP double DET1 High Voltage Filter temperature.
I_DET1AMPBTEMP double DET1 segment B Amplifier temperature.
I_DET1AMPATEMP double DET1 segment A Amplifier temperature.


Table E.2: Table E.1 (continued)a
Array NameFormatDescription
I_DET1TDCBTEMP double DET1 TDC B temperature.
I_DET1TDCATEMP double DET1 TDC A temperature.
I_DET1MCPBBIASCUR double DET1 MCP B Bias Current
I_DET1MCPABIASCUR double DET1 MCP A Bias Current
I_DET1HVBIASBST double DET1 MCP-B High Voltage Bias setting
I_DET1HVBIASAST double DET1 MCP-A High Voltage Bias setting
I_DET1UPRQTHRBST double DET1 TDC-B Upper Charge Threshold setting.
I_DET1UPRQTHRAST double DET1 TDC-A Upper Charge Threshold setting.
I_DET1BEGWLKBST double DET1 TDC-B Begin CFD Walk setting.
I_DET1BEGWLKAST double DET1 TDC-A Begin CFD Walk setting.
I_DET1ENDWLKBST double DET1 TDC-B End CFD Walk setting.
I_DET1ENDWLKAST double DET1 TDC-A End CFD Walk setting.
I_DET1BSLTHRBST double DET1 TDC-B charge Baseline inspector window Thr
I_DET1BSLTHRAST double DET1 TDC-A charge Baseline inspector window Thr
I_DET1LWRQTHRBST double DET1 TDC-B Lower Charge Threshold setting.
I_DET1LWRQTHRAST double DET1 TDC-A Lower Charge Threshold setting.
I_DET1LWRTTHRBST double DET1 TDC-B Lower Time Threshold setting.
I_DET1LWRTTHRAST double DET1 TDC-A Lower Time Threshold setting.
I_DET1HVGRIDST integer DET1 Grid High Voltage Status (0=OFF; 1=ON)
I_DET1HVPWRST integer DET1 Bias High Voltage Status (0=OFF; 1=ON)
I_DET1STIMLMPST integer DET1 Stimulation Lamp Status (0=OFF; 1=ON)
I_DET2TEMP double DET2 Detector temperature.
I_DET2HVMODLTEMP double DET2 High Voltage Module temperature.
I_DET2HVFLTRTEMP double DET2 High Voltage Filter temperature.
I_DET2AMPBTEMP double DET2 segment B Amplifier temperature.
I_DET2AMPATEMP double DET2 segment A Amplifier temperature.
I_DET2TDCBTEMP double DET2 TDC B temperature.
I_DET2TDCATEMP double DET2 TDC A temperature.
I_DET2MCPBBIASCUR double DET2 MCP B Bias Current
I_DET2MCPABIASCUR double DET2 MCP A Bias Current
I_DET2HVBIASBST double DET2 MCP-B High Voltage Bias setting
I_DET2HVBIASAST double DET2 MCP-A High Voltage Bias setting
I_DET2UPRQTHRBST double DET2 TDC-B Upper Charge Threshold setting.
I_DET2UPRQTHRAST double DET2 TDC-A Upper Charge Threshold setting.
I_DET2BEGWLKBST double DET2 TDC-B Begin CFD Walk setting.
I_DET2BEGWLKAST double DET2 TDC-A Begin CFD Walk setting.
I_DET2ENDWLKBST double DET2 TDC-B End CFD Walk setting.
I_DET2ENDWLKAST double DET2 TDC-A End CFD Walk setting.
I_DET2BSLTHRBST double DET2 TDC-B charge Baseline inspector window Thr
I_DET2BSLTHRAST double DET2 TDC-A charge Baseline inspector window Thr


Table E.3: Table E.1 (continued)a
Array NameFormatDescription
I_DET2LWRQTHRBST double DET2 TDC-B Lower Charge Threshold setting.
I_DET2LWRQTHRAST double DET2 TDC-A Lower Charge Threshold setting.
I_DET2LWRTTHRBST double DET2 TDC-B Lower Time Threshold setting.
I_DET2LWRTTHRAST double DET2 TDC-A Lower Time Threshold setting.
I_DET2HVGRIDST integer DET2 Grid High Voltage Status (0=OFF; 1=ON)
I_DET2HVPWRST integer DET2 Bias High Voltage Status (0=OFF; 1=ON)
I_DET2STIMLMPST integer DET2 Stimulation Lamp Status (0=OFF; 1=ON)
I_FPD_Q_ECIBDY1 double ECI to body quaternion 1
I_FPD_Q_ECIBDY2 double ECI to body quaternion 2
I_FPD_Q_ECIBDY3 double ECI to body quaternion 3
I_FPD_Q_ECIBDY4 double ECI to body quaternion 4
aAll Temperatures are in Degrees, currents in Amps.