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Subsections



13.2 ERD Product Types


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

PHT-P Edited Raw Data
Record length: 28 bytes


FIELD    Off N  T    Description			  Comment
GPSCTKEY 0   1	I*4  Instrument time key	   	  see IDPD, unit= $2^{-14}$ 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

PHT C100 Edited Raw Data
Record length: 48 bytes


FIELD    Off N  T    Description  		    Comment
GPSCTKEY 0   1  I*4  Instrument time key	    see IDPD, unit= $2^{-14}$ 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

PHT C200 Edited Raw Data
Record length: 44 bytes


FIELD    Off N  T    Description		    Comment
GPSCTKEY 0   1	I*4  Instrument time key 	    see IDPD, unit= $2^{-14}$ 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

PHT-S Edited Raw Data
Record length: 292 bytes


FIELD    Off N  T    Description		    Comment
GPSCTKEY 0   1	I*4  Instrument time key 	    see IDPD, unit= $2^{-14}$ 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

PHT-ERD Compact Status
Record length 128 bytes


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		  		$2^{n}-1 $    $ \dagger$ 
PSTANDR  102 1 	I*2  No. DRs per chopper plateau		$2^{n} $    $ \dagger$ 
PSTAINTT 104 1 	I*2  Integration time 		 		$2^{7-n}$ sec     $ \dagger$ 
PSTAMEAT 106 1 	I*2  Measurement time 		 		$2^{n} $ sec    $ \dagger$ 
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 $n$. The formula in the last column above gives the actual value.


next up previous contents index
Next: 13.3 SPD Product Types Up: 13. Products Description Previous: 13.1 Overview
ISO Handbook Volume IV (PHT), Version 2.0.1, SAI/1999-069/Dc