Sequencer Site SIRTF IOC Activity c. 2002

CAID: MIPS-180 Title: Electronic Nonlinearities Verification
 
System: MIPS Principal: kgordon Deputy: jmuzerolle
Objective:   
Verify the electronic nonlinearites are unchanged
from  pre-lanch measurements.  Data will also be
used to assess the flight Ge noise levels and
cosmic ray behavior.
 
Description: 
All three MIPS arrays display nonlinearites due to
their electronics. These nonlinearities will 
be well characterized in pre-launch tests and this
task will verify they have not changed.

Extensive pre-launch tests will be used to construct 
the electronic linearity corrections for all 
three arrays.  This task will verify that these
corrections are still the appropriate ones to use.

Outline of the Task:
**All the data will be 10 MIPS second exposures**

1) Turn on the 70um flash stim to a level which (on average) fill 1/4 well in 10s
   Turn on the 160um flash stim to a level which (on average) fill 1/4 well in 10s
   Take a 50 10s DCEs on both the 70 and 160um arrays.
   Turn on the 70um flash stim to a level which (on average) fill 1/2 well in 10s
   Turn on the 160um flash stim to a level which (on average) fill 1/2 well in 10s
   Take a 50 10s DCEs on both the 70 and 160um arrays.
   Turn the 70um flash stim to a level which (on average) fills the well in 10s
   Turn the 160um flash stim to a level which (on average) fills the well in 10s
   Take a 50 10s DCEs on both the 70 and 160um arrays. 
   Turn the 70um flash stim to a level which (on average) fill 1 1/2 the well in 10s
   Turn the 160um flash stim to a level which (on average) fill 1 1/2 the well in 10s
   Take a 50 10s DCEs on both the 70 and 160um arrays.
2) Point to the 24um dark position
   Turn on the 24um stim to a level which (on average) fill 5% well in 10s
   Take a 50 10s *RAW* DCEs.
   Turn on the 24um stim to a level which (on average) fill 7/8 well in 10s
   Take a 50 10s *RAW* DCEs.
 
Day:   61.6270833333401 Suggested Order:   O600
 
Must be preceded by these activities (list by CAID):   MIPS-115, MIPS-245, MIPS-246, MIPS-247, MIPS-248
 
Place in Schedule:   This test should be done early in IOC, but after basic validation of the instrument has been done.
 
Priority:   Necessary

Conditions

Maximum telescope temperature: 6.5 K
 
Minimum telescope temperature: 5.5 K
 
Should activity be repeated if focus changes?   No     Repeat if focus changes by 0 mm
 
Maximum absolute pointing uncertainty: 3600 arcsec (1 sigma radial)
 
Maximum precision offset uncertainty: 3600 arcsec  (1 sigma radial)
 
Observatory configuration: Standard
 
Go/No Go criteria: Array temperatures must be stable, detectors must be functioning nominally

Resources

Duration:   60 minutes
 
Real time downlink:   No   

Data Volume (uncompressed): 948 Mbits
 
List Blocks, AORs, SERs, IERs, or unique sequences required (uplink):
 
List Analysis tools required (downlink):   DAT - mips_sloper. MIPS visualization tool (IDL program: xsloper_view.pro)

Outcome

Estimate of data turn around:   72 hours
 
Description: Run data through pipeline. Use the pre-launch linearity corrections and check that the ramps are linear after being corrected. Should quanify the average level of nonlinearity which is acceptable - 1% (TBR).
 
Can proceed in parallel with other activity: No
 
Must outcome be confirmed before next activity: No
 
Method of Confirmation:   Data analysis. (mips_sloper and xsloper_view.pro)
 
 
Success criteria: Good enough data to characterize the linearity of the ramps on all three arrays. At least 10 good DCEs at each brightness level are required. Initial success will be judged on a by-eye basis and
 
Contingency plan:  If the test fails for operational reasons, other IOC data can probably be used to check the linearity. If the nonlinearities are different from those measured pre-launch, a full electronic nonlinearities test will need be be done (more stim amplitudes - probably 10x the duration).
 
 

Comments

 
References:  
 
Additional Comments:
 
This activity last updated: 10/22/2002 7:14:39 PM