13.2.1 Rationale behind product design

As the ERD is reformatted telemetry data, the different ERD products reflect the data structures related to the different PHT sub-systems: single pixel data (P1, P2, and P3), 9 pixel data (PHT-C100), 4 pixel data (PHT-C200) and 128 pixel data (PHT-S). Each ERD product is accompanied by one compact status product with product name prefix `PSTA'. A compact status record defines the instrument configuration for one measurement. The structure of the compact status product is the same for all PHT subinstruments.

13.2.2 Product PPER

FIELD Off N T Description Comment GPSCTKEY 0 1 I*4 Instrument time key see IDPD, unit= s GPSCRPID 4 2 I*1 Raster point ID points and lines GPSCFILL 6 1 I*2 Filler empty PPERPIXF 8 1 I*2 Bit flags accompanying pixels Appendix B.4 PPERPCS1 10 1 I*2 Power of calibration source1 Appendix B.2 PPERPCS2 12 1 I*2 Power of calibration source2 Appendix B.2 PPERFIL1 14 1 I*2 Spare PPERTEMP 16 1 I*2 Measured temperature P1, P2, or P3 Appendix B.1 PPERFIL2 18 2 I*2 Spare PPERCPOS 22 1 I*2 Measured chopper position Appendix B.3 PPERMBV 24 1 I*2 Measured bias voltage P1, P2, or P3 PPERPIX 26 1 I*2 IR data (1 pixel) 12 bits used, see Appendix B.2

13.2.3 Product P1ER

FIELD Off N T Description Comment GPSCTKEY 0 1 I*4 Instrument time key see IDPD, unit= s GPSCRPID 4 2 I*1 Raster point ID points and lines GPSCFILL 6 1 I*2 Filler P1ERPIXF 8 1 I*2 Bit flags accompanying pixels Appendix B.4 P1ERPCS1 10 1 I*2 Power of calibration source1 Appendix B.2 P1ERPCS2 12 1 I*2 Power of calibration source2 Appendix B.2 P1ERCREV 14 1 I*2 Measured CRE checkout voltage see note below P1ERTEMP 16 1 I*2 Measured temperature C100 Appendix B.1 P1ERFILL 18 2 I*2 Spare P1ERCPOS 22 1 I*2 Measured chopper position Appendix B.3 P1ERMBV 24 1 I*2 Measured bias voltage C100 P1ERPIXR 26 1 I*2 IR data (resistor) see note below P1ERPIXO 28 1 I*2 IR data (open) P1ERPIX 30 9 I*2 IR data: 9 pixels for pixel ordering see Section 2.6.2 12 bits used, see Appendix B.2

Note: The CRE checkout voltage is of no importance for the analysis of the IR data. It was a diagnostic DC voltage which was applied to the CRE resistor pixel for PHT-C and PHT-S and produced a kind of load curve at the output of the resistor pixel. This worked like a connection to a normal CRE channel of a detector pixel. However, the resistance of this special channel was much smaller than that of a high-ohmic detector pixel.

13.2.4 Product P2ER

FIELD Off N T Description Comment GPSCTKEY 0 1 I*4 Instrument time key see IDPD, unit= s GPSCRPID 4 2 I*1 Raster point ID points and lines GPSCFILL 6 1 I*2 Filler P2ERPIXF 8 1 I*2 Bit flags accompanying pixels Appendix B.4 P2ERPCS1 10 1 I*2 Power of FCS 1 Appendix B.2 P2ERPCS2 12 1 I*2 Power of FCS2 Appendix B.2 P2ERCREV 14 1 I*2 Measured CRE checkout voltage see Note 13.2.3 P2ERTEMP 16 1 I*2 Measured temperature C200 Appendix B.1 P2ERFILL 18 2 I*2 Spare P2ERCPOS 22 1 I*2 Measured chopper position Appendix B.3 P2ERMBV1 24 1 I*2 Measured bias voltage pixel1 see Section 2.6.2- P2ERMBV2 26 1 I*2 Measured bias voltage pixel2 -for pixel position on sky P2ERMBV3 28 1 I*2 Measured bias voltage pixel3 P2ERMBV4 30 1 I*2 Measured bias voltage pixel4 P2ERPIX1 32 1 I*2 IR data (pixel 1) see Section 2.6.2 - P2ERPIX2 34 1 I*2 IR data (pixel 2) -for pixel position on sky P2ERPIX3 36 1 I*2 IR data (not used) P2ERPIX4 38 1 I*2 IR data (pixel 3) P2ERPIX5 40 1 I*2 IR data (pixel 4) see Appendix B.2 for bit usage P2ERPIX6 42 1 I*2 IR data (resistor)

13.2.5 Product P2ES

PHT C200 Edited Raw Data for PHT serendipity mode
Record length: 44 bytes
Identical record structure as for product P2ER (Section 13.2.4), the prefix P2ER should be replaced by P2ES.

13.2.6 Product PSER

FIELD Off N T Description Comment GPSCTKEY 0 1 I*4 Instrument time key see IDPD, unit= s GPSCRPID 4 2 I*1 Raster point ID points and lines GPSCFILL 6 1 I*2 Filler PSERPIXF 8 1 I*2 Bit flags accompanying pixels Appendix B.4 PSERPCS1 10 1 I*2 Power of calibration source 1 no meaning, FCS always off in AOT PSERPCS2 12 1 I*2 Power of calibration source 2 no meaning, FCS always off in AOT PSERCREV 14 1 I*2 Measured CRE checkout voltage see note Section 13.2.3 PSERTEM1 16 1 I*2 Measured temperature S1(SL) Appendix B.1 PSERTEM2 18 1 I*2 Measured temperature S2(SS) Appendix B.1 PSERFILL 20 1 I*2 Spare PSERCPOS 22 1 I*2 Measured chopper position Appendix B.3 PSERMBV1 24 1 I*2 Measured bias voltage S1(=SL) PSERMBV2 26 1 I*2 Measured bias voltage S2(=SS) PSERPIX1 28 66 I*2 IR data for SL branch includes 2 resistor pixels: no. 65 and 66 12 bits used, see Appendix B.2 PSERPIX2 160 66 I*2 IR data for SS branch includes 2 resistor pixels: no. 65 and 66 12 bits used, see Appendix B.2

13.2.7 Product PSTA

FIELD Off N T Description Comment CSGPUKST 0 1 I*4 UTK start time Universal Time Keys- CSGPUKEN 4 1 I*4 UTK end time - see [20] CSGPIKST 8 1 I*4 ITK start time CSGPIKEN 12 1 I*4 ITK end time CSGPUTST 16 2 I*4 UTC start time Universal Time- CSGPUTEN 24 2 I*4 UTC end time - Coordinated CSGPOSN 32 1 I*1 Observation Sequence Number also ION, as in PGA CSGPFILL 33 15 I*1 Spare PSTAERR 48 1 I*4 Housekeeping ExHK discrepancy err. code flags discrepancies in the housekeeping PSTASUBS 52 1 I*2 Subsystem PSTAOPFO 54 1 I*2 Chopper OPF Override PSTAF1TS 56 1 I*2 TRS(FCS1) value: 1 or 2 see Section 2.7 PSTAF2TS 58 1 I*2 TRS(FCS2) value: 1 or 2 PSTAF1PS 60 1 I*2 FCS1 power sel. in mW PSTAF2PS 62 1 I*2 FCS2 power sel. in mW PSTAC1PS 64 1 I*2 CHW1 position (selected) value: 1 - 14, see Appendix A.1 PSTAC2PS 66 1 I*2 CHW2 position (selected) idem PSTAC3PS 68 1 I*2 CHW3 position (selected) idem PSTACMOD 70 1 I*2 Chopper mode see Table 13.2 PSTACAMP 72 1 I*2 Chopper amplitude as commanded in arcsec PSTACSTE 74 1 I*2 Chopper step as commanded PSTACINC 76 1 I*2 Chopper increment as commanded in arcsec PSTACRES 78 1 I*2 CRE switch PSTADETA 80 1 I*2 Detector assy detector assembly PSTADRS 82 1 I*2 Data reduction size integer, see Section 2.4.4 PSTAMUX1 84 1 I*2 MUX1 line multiplexer line PSTAMUX2 86 1 I*2 MUX2 line multiplexer line PSTAXSTA 88 1 I*2 Cross status of multiplexer line PSTAD1OF 90 1 I*2 DIE1 offset see Section 7.2.6 PSTAD1GA 92 1 I*2 DIE1 gain idem PSTAD2OF 94 1 I*2 DIE2 offset idem PSTAD2GA 96 1 I*2 DIE2 gain idem PSTAFREQ 98 1 I*2 clock speed of CRE value 1, 4, or 8 (kHz) PSTANNDR 100 1 I*2 No. NDRs per ramp PSTANDR 102 1 I*2 No. DRs per chopper plateau PSTAINTT 104 1 I*2 Integration time sec PSTAMEAT 106 1 I*2 Measurement time sec PSTAMPC1 108 1 I*2 Measurement position CHW1 value: 1 - 14, see Appendic A.1 PSTAMPC2 110 1 I*2 Measurement position CHW2 idem PSTAMPC3 112 1 I*2 Measurement position CHW3 idem PSTAMET 114 1 I*2 Measured EEU temperature see Appendix B.1 PSTASER 116 1 I*2 PHT serendipity mode flag 1= serendipity; 0= prime instrument PSTAFILL 118 10 I*1 Filler

**Table 13.2:** *Coding of chopper mode.*
Mode	Description
0,1	sawtooth chopping
2, 3	triangular chopping
4, 5, 6, 7	rectangular chopping
8	chopping between FCS1 and FCS2
13	staring CFOV
14	staring FCS1
9, 10, 11, 12, 15	not used in AOTs

$\dagger$ The value given in the product is

. The formula in the last column above gives the actual value.