PROCEDURE: 10h

TITLE: HRC image stability test

CATEGORY: verification

PURPOSE: To determine and quantify if there are any end-to-end shifts or
drifts in the HRC between the coronographic arm and the HRC detector.

FREQUENCY: Run continuosly while the HRC makes thermal transition(s)
during the ACS thermal vacuum tests.

DETECTOR: HRC

PREREQUISITES: exposure levels with STUFF determined (done).  Coronographic arm
in place.

HARDWARE REQUIREMENTS: STUFF + PtNe1 + micro-mirror array.
Coronographic arm must not be moved during test.  Filter wheel should
also not move.

SOFTWARE REQUIREMENTS: acs_gain, acs_stats

COMMAND MODE: SMS

PROCEDURE/EXPOSURES:  
  F606W  --> countrate = 32.7 KHz/pixel
     1.   0.0s   bias
  2-16.   0.8s   external F606W   level = 26.1k 
	         Dump data
    17.   0.0s   bias
 18-32.   0.8s   external F606W   level = 26.1k 
	         Dump data
    33.   0.0s   bias
 34-48.   0.8s   external F606W   level = 26.1k 
	         Dump data
VARIANTS: 

TOTAL EXPOSURES: 48

TOTAL TIME: setup + 48*overhead + 3*dump = 1.01hr
    Assume setup = 600s, overhead = 41s (from previous SMS's), dump = 358s

ANALYSIS:
    *collapse column and row cuts through central coron. spot
    to 1d, cross-correlate with initial column and row cuts,
    to derive horizontal  and vertical shifts.
    *plot shifts as a function of environmental temperature,
    and time.  
    * note any drifts or sudden shifts.