HST Keyword Dictionary

Space Telescope Science Institute

3700 San Martin Drive

Baltimore, MD 21212

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Keyword Definitions for the

dated 15-APR-94

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KXBFOCUS
COSTAR FOC M1 Focus Position (mm) 
Datatype: REAL*4              
Units:       mm

Source :

KYBFOCUS
COSTAR FOS M1 Focus Position (mm) 
Datatype: REAL*4              
Units:       mm

Source :

KYBXTILT
COSTAR FOS M1 X-tilt Position (arcsec) 
Datatype: REAL*4              
Units:       arcsec

Source :

KYBYTILT
COSTAR FOS M1 Y-tilt Position (arcsec) 
Datatype: REAL*4              
Units:       arcsec

Source :

KYDEPLOY
COSTAR deployed for FOS (T or F) 
Datatype: LOGICAL*1           
Units:
The logical KYDEPLOY keywords are to be set to True only if the COSTAR arm for the FOS has been deployed. There are two conditions under which this keyword should be set to False. Before the servicing mission, a database flag will have to be set to instruct PODPS not to extract the COSTAR mirror positions from the SHP (the telemetry positions will still correspond to HSP data), set the DEPLOY keywords to False and set the mirror position keywords to a default value (99999). Once COSTAR is installed in HST, the database flag will be set to indicate that the COSTAR SHP entries are valid. PODPS should then populate the DEPLOY keywords based on the SHP position telemetry values. If any of the telemetered values for a given SI are the default value (99999), then the DEPLOY keyword for that SI should be set to false. This will allow for the possibility of deploying some COSTAR arms and not others.

Source :

SS_APER
aperture id 
Datatype: CHARACTER*03        
Units:                        
         APER_ID           Aperture                                             
           A-2             0.5-PAIR                                             
           A-3             0.25-PAIR                                            
           A-4             0.1-PAIR                                             
           B-1             0.5                                                  
           B-2             0.3                                                  
           B-3             1.0                                                  
           B-4             BLANK                                                
           C-1             1.0-PAIR                                             
           C-2             0.25x2.0                                             
           C-3             2.0-BAR                                              
           C-4             0.7x2.0-BAR                                          
           ERR             error

Source :

SS_DET
detector in use: amber (side A), blue (side B) 
Datatype: CHARACTER*08        
Units:
Indicates which of the two FOS detectors (AMBER or BLUE) was used.

Source :

SS_FCHNL
first channel 
Datatype: INTEGER*4           
Units:       CHANNEL NUMBER
The first channel (diode) to be processed: 0,2,4,...,510 or -1 for error.

Source :

SS_FGWA
FGWA id 
Datatype: CHARACTER*03        
Units:       NAME
Identifies the dispering element (grating or prism) used in the observation. 
              Disperser       FGWA_ID                                           
                G130H           H13                                             
                G190H           H19                                             
                G270H           H27                                             
                G400H           H40                                             
                G570H           H57                                             
                G780H           H78                                             
                G160L           L15                                             
                G650L           L65                                             
                PRISM           PRI                                             
             or ERR for error.

Source :

SS_MODE
ground software mode 
Datatype: CHARACTER*18        
Units:                        
        LED-FLAT-FIELD-MAP      (IMAGE)                                         
        TIME-RESOLVED           (PERIOD)                                        
        TIME-TAGGED             (TAG)                                           
        RAPID-READOUT           (RAPID)                                         
        TARGET ACQUISITION      (ACQ,ACQ/BINARY,ACQ/PEAK,ACQ/FIRMWARE)          
        SPECTROSCOPY            (no polarizer)                                  
        SPECTROPOLARIMETRY      (with polarizer)

Source :

SS_NCHNL
number of channels 
Datatype: INTEGER*4           
Units:       COUNT
The number of channels to be processed: 2,4,...,512 or -1 for error.

Source :

SS_NXSTP
number of x steps 
Datatype: INTEGER*4           
Units:
The number of xsteps per ystep: 1,...,32 or -1 for error. X-steps are magnetic field deflections of the electrons in the dispersion (x) direction. The default value for X-step is 4, the so-called "quarter stepping" that will place the electrons on the next diode after 4 steps. The data go into new memory locations with each X-step. The reason for x-stepping is to satisfy the Nyquist sampling criterion, which requires X-step greater than or equal to 2.

Source : (FOS Handbook)

SS_OVSCN
overscan number 
Datatype: INTEGER*4           
Units:
The overscan number: 1,2,3,4,...,256 or -1 for error. The overscan parameter indicates the number of times to repeat the addition of counts into the memory array, with an offset of one memory location at each overscan. Each offset is accompanied by a corresponding magnetic deflection in the x-direction so that data from a given photocathode location falls into the same memory location independent of the diode which sampled it. The purpose is to average out the response of different diodes, including dead ones.

Source : (FOS Handbook)

SS_POLAR
polarizer id 
Datatype: CHARACTER*01        
Units:
Name of the polarizer in use (if any) for the observation. 
                A:      polarizer A;                                            
                B:      polarizer B;                                            
                C:      no polarizer;                                           
                E:      error.

Source :

Y5VLPSV
+5V logic power supply voltage 
Datatype: REAL*4              
Units:

Source :

Y8VQPSV
+8V quiet power supply voltage 
Datatype: REAL*4              
Units:

Source :

YCALVLT
calibration lamp supply voltage 
Datatype: REAL*4              
Units:

Source :

YCLSCUR
calibration lamp supply current 
Datatype: REAL*4              
Units:

Source :

YDSCRVLT
discriminator reference voltage 
Datatype: REAL*4              
Units:

Source :

YFGIMPEN
onboard GIMP correction enabled (T/F) 
Datatype: LOGICAL*1           
Units:
Data obtained after April 5, 1993 have the option of using the onboard GIMP-correction scheme. Data obtained without the onboard correction require the groundbased pipeline calibration correction. The onboard GIMP correction is applied on a finer grid than the groundbased correction, and is applied in both the dispersion (x) and spatial (y) directions of the diode array. The onboard GIMP correction is calculated and applied every 30 seconds.

Source :

YFGIMPER
error in onboard GIMP correction (YES/NO) 
Datatype: CHARACTER*03        
Units:
Indicates whether or not an error occured during application of the onboard GIMP correction.

Source :

YHVCUR
high voltage supply current 
Datatype: REAL*4              
Units:

Source :

YHVVLT
high voltage supply voltage 
Datatype: REAL*4              
Units:

Source :

YkkkTMP
temperatures at various sensors 
Datatype: REAL*4              
Units:    Degrees             
                                                                                
  These keywords report the temperatures at various sensors on or               
  surrounding the instrument.                                                   
                                                                                
  For normal operations this parameter should be within:                        
                                                                                
               Red     Yellow     Yellow        Red                             
           Minimum    Minimum    Maximum    Maximum                             
  Y1OATMP   -50.00     -35.00      31.00      40.00   optics area 1             
  Y2OATMP   -50.00     -35.00      31.00      40.00   optics area 2             
  Y1OBTMP   -11.00      -2.00      33.00      42.00   optical bench Temp 1      
  Y2OBTMP   -11.00      -2.00      33.00      42.00   optical bench Temp 2      
  Y3OBTMP   -11.00      -2.00      33.00      42.00   optical bench Temp 3      
  Y4OBTMP   -11.00      -2.00      33.00      42.00   optical bench Temp 4      
  YAPERTMP  -24.00     -15.00      37.00      46.00   aperture mechanism        
  YARIUTMP  -40.00     -32.00      33.00      60.00   RIU-A temperature         
  YBRIUTMP  -40.00     -32.00      33.00      60.00   RIU-B temperature         
  YCEATMP   -50.00     -35.00      33.00      60.00   central electronics       
  YCPSTMP   -40.00     -30.00      33.00      60.00   central power supply      
  YDOORTMP  -24.00     -15.00      37.00      46.00   entrance door mechanism   
  YFGMATMP  -24.00      -9.00      31.00      46.00   filter/grating motor A    
  YFGMBTMP  -24.00      -9.00      31.00      46.00   filter/grating motor B    
  YHVTMP    -50.00     -35.00      33.00      60.00   high voltage supply       
  YPAMATMP  -50.00     -35.00      33.00      60.00   pre-amp assembly A        
  YPAMBTMP  -50.00     -35.00      33.00      60.00   pre-amp assembly B        
  YPCATMP   -40.00     -32.00      23.00      50.00   photocathode A            
  YPCBTMP   -40.00     -32.00      23.00      50.00   photocathode B            
  YPMFATMP  -40.00     -32.00      23.00      50.00   focus assembly A          
  YPMFBTMP  -40.00     -32.00      23.00      50.00   focus assembly B          
  YPOLRTMP  -24.00     -15.00      37.00      46.00   polarizer mechanism       
  YSIGPTMP  -50.00     -35.00      33.00      60.00   signal processor          
  YXYDFTMP  -50.00     -36.00      40.00      60.00   XY-deflection focus

Source : PDB 40D, OMS 12.0

YTRMFCUR
trim focus coil driver current 
Datatype: REAL*4              
Units:

Source :

YXDEFCUR
X-deflection coil driver current 
Datatype: REAL*4              
Units:

Source :

YYDEFCUR
Y-deflection coil driver current 
Datatype: REAL*4              
Units:

Source :

HST Keyword Dictionary: 15-APR-94: (rose@stsci.edu)