| CAID: MIPS-015 | Title: CE State Validation & Functional Tests | |
| System: MIPS | Principal: dmkelly | Deputy: alberto |
| Objective: | Verify that the combined electronics are active and functioning properly, with the instrument receiving commands and emitting telemetry and science data as expected. Determine that the MIPS detectors are alive and responsive; verify the 24um RAW and SUR observation modes. Verify scan mirror motions, stim flashes, and basic commanding by running a photometry AOT. Check coadding and prove that the system can handle collecting data in the most demanding possible observing mode. Verify thermal control of the 24um array. Perform thermal anneals on all three arrays and show that the temperature profiles are as expected. |
| Description: | 1) Perform thermal anneals on all three MIPS arrays, using diagnostic data collection
mode to monitor temperatures
2) Switch to the B-side Si heater, commanded to 5.0K
3) Perform the mips_mobs_phot state transition
4) Point the scan mirror to the 24um internal dark position, and collect 10 4s DCEs in
RAW mode. Change the Vrst values to put negative bias on the Ge arrays. Collect 10
3s DCEs in SUR mode. Change the Vrst voltages back to their nominal values.
5) Run a MIPS worst case processor load test by collecting 5 DCEs in SUR mode with
coadding=8 and with a framecount of 61
6) Perform the mips_backto_mobs state transition
7) Run a 70um compact source photometry AOT |
| Day: 5.94027777778683 | Suggested Order: A100 | ||
| Must be preceded by these activities (list by CAID): MIPS-900A | |||
| Place in Schedule: During initial CE power-up and verification checkout, about one week after launch. | |||
| Priority: Critical | |||
Conditions | |||
| Maximum telescope temperature: | 300 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: | CE must be alive | ||
Duration: 60 minutes
| | Real time downlink:
No | | |||
| Data Volume (uncompressed): 60 Mbits | |||
| List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): 70um compact source PHOT AOT; Special IERs | |||
| List Analysis tools required (downlink): Spreadsheet for looking at diagnostic data (procedures have been developed for converting these data into the proper format); telemetry viewing tools and perhaps scripts for comparing the telemetry with expected values; CSMM visualization tool | |||
| Estimate of data turn around: 48 hours | |||
| Description: We have visualization tools that show us what the scan mirror motions should look like for each of the skeleton AOTs, so we can compare our diagnostic data with those predictions. We have experience with over 100 telemetry items from our ground-based functional test, so we can verify that the telemetry items are giving proper results during state transitions and AOTs. Thermal diagnostic data will be converted into spreadsheet format, and temperatures will be plotted versus time. Since the array and instrument temperatures will be comparable to those seen during CTA and ATLO cold instrument tests, we will be able to compare the thermal behavior of the instrument with what was observed in those earlier tests and confirm that the behavior is fundamentally unchanged. We will verify by inspection that anneal temperatures reach expected values, and we will verify that the 24um array temperature control provides adequate accuracy and stability. | |||
| Can proceed in parallel with other activity: No | |||
| Must outcome be confirmed before next activity: Yes | |||
| Method of Confirmation: Inspection of telemetry items and comparison with ground-based data and with the output of CSMM visualization tool | |||
| Success criteria: Successful execution of all commands. Reasonable telemetry values. Collection of the appropriate amount of data. Appropriate responses from detectors. Proper thermal response to thermal ann | |||
| Contingency plan: Verify commanding. If the scripts are ok, determine if the fault lies in hardware or in software and make corrections if possible. Perform software fixes and try again -- we might need to deactivate some limit checking (by patching more lenient limits) to avoid safing on temperature violations. If the thermal anneal heaters fail and cannot be revived, we can anneal the arrays using the less effective techniques of bias boosts and photon flooding. If the Si active thermal control fails, we can use passive control of the Si array temperature. If the Si array heater fails, the reduced array temperature will greatly compromise the resilience of the array against transient effects. If the thermal conductances of the instrument have changed, we will have to assess the operability of the instrument, especially the 160um array. | |||
Comments | |||
| References: | |||
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Additional Comments:
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| This activity last updated: 10/22/2002 8:57:01 PM | |||