MIPS_225a Stability

IOC-MIPS_225a     10510C,10550C          
Title:   Instrument Stability            
                 
Objective:   To measure how long after the turn-on sequence it takes the instrument to            
    become stable enough to start science observations.            
    Also, to measure how stable the instrument remains through several on/off cycles.            
                 
Description:   This test will require taking data at a regular frequency soon after the            
    instrument is turned on, until the output is stable.            
    Similar data should be taken periodically throughout the instrument campaign to            
    ensure that the instrument response remains stable.            
    This template should simply be a series of standard tests we run through            
    every time we turn the instrument on and periodically throughout a campaign, similar            
    to what we use in laboratory testing. A sequence of 50 dark DCEs and            
    50 stim DCEs is probably appropriate. This will also help us track how the dark            
    current changes throughout a campaign. This means we won't need the scan mirror            
    or any of the observing AOTs working yet - we just want to turn a stim on and look            
    at it for awhile.            
                 
Place in Schedule:   This test should be done as soon as the telescope is cold enough to            
    measure standard stars at 70 and 160 microns.            
                 
Required Conditions:   We should be pointed at a dark patch of sky as for the standard dark measurement,            
    but PCS accuracy and stability are not required (a few arcminutes is ok)            
                 
Resources:                
  duration (best estimate)       Using 10-second DCEs, 20 minutes each time it's used (e.g., 10 times = 3.3 hours)      
  real time downlink (Y / N)       n      
  special post event actions (Y / N)       data must be analyzed      
  number of DCEs       300 each time it's used (e.g., 10 times = 3000)      
                 
Outcome:                
  description         set of SUR exposures    
  can proceed in parallel with other activity         y    
  must outcome be confirmed before next event / test /activity         n    
  method of confirmation (sensor TLM, data analysis, etc.)         simple analysis (average slope and dispersion)    
  estimate of data turn around if required for confirmation              
                 
Unique or included in planned uplink or downlink/analysis tool           should execute dark and stim IETs    
                 
Contingency Plan:                
"What if..."                
                 
IOC Critical         Y      
                 
References:                
                 
Template last updated:         11-Sep-95      
          C.W. Engelbracht      
                 

Last Updated on 10/7/99
By Marcia Rieke
Email: mrieke@as.arizona.edu