Procedure for LET Comprehensive Performance Test Doc. No
Contents
1. Pape 5 Procedure for LET Comprehensive Performance Test Doc No STEREO CIT 026 B UTC 2 2 2 SEP_Central Aliveness Test STEREO CIT 034 A 2a Open all SEP displays on SEP GSE G if OK and ready to continue UTC 2b Verify SEP main 28V supply current A It can vary depending on how many SEP sensors are attached to SEP Central for LET alone 0 215A for LET HET FM1 0 228A for LET HET FM2 0 226A for complete SEP 0 307A If operating at cold the operational heaters will turn on off periodically and draw a predictable amount of extra current UTC 2c Verify SEP main 28V supply voltage V 28V 2d The following command returns elapsed time in hours minutes seconds sub seconds since the last booting UTC SEP gt TIME Note there is no space between E and the dot record 2e Verify that SEP Central section of SEP Housekeeping display bottom portion has no indication of yellow red limit violations for voltages and temperatures monitored V if OK Record SEP Central HK anomalies here 2f Verify that two bias voltage monitors are showing approx 120V and 330V v if OK 2g Snap SEP GSE HK page display and file it at the back of this procedure V if OK 2h Compare HK page display with a reference sample Confirm there are no discrepancies v if OK 2i Observe and verify that all sensors CCSDS packets are flowing regularly on a minute by minute basis SIT 12 science packets minute a v if OK HET 6 science pa2. UTC 2 2 4 ADC Only Mode minimum running time 10 minutes 4a The following command puts LET in ADC Only Mode by disabling Livetime stimulus pulse and adjusting ADC pulse rate in order to read out events from all 32 DAC levels per each ADC UTC LET gt ADCMODE v echo UTC 4b Wait at least 2 minutes for new telemetry then open 2 D plots of L1 vs L2 and L1 vs L3 for both A and B sides of the telescope Use log log scale and dither Vv if OK 4c Monitor single detector rates and event totals by priority Snap LET page displays label and file them at the back of this procedure Compare 2 D plots event and rate page displays with reference samples v 4d Fit and analyze data off line Person s responsible for the analysis Analysis results will be available date location UTC 4e If there are no anomalies above ADC Only Mode procedure is complete Record its total running time and any observations or anomalies here UTC 2 2 5 Quiet Mode minimum running time 5 minutes 5a The following command puts LET in Quiet Mode by disabling ADC and Livetime stimulus pulse in order to check for noisy detectors UTC LET gt QUIET v echo UTC 5b Wait at least 2 minutes for new telemetry then snap LET page displays label and file them at the back of this procedure Compare rate page displays with reference samples Confirm there are no discrepancies and no noisy detectors V if OK UTC 5c If there are no anomalies
3. Mode 2 2 6 Threshold Mode 2 2 7 LET Heater Mode a 2 2 8 SEP Power Off STEREO CIT 032 A 2 3 TEST DURATION 1 hour maximum expected time Page 1 Procedure for LET Comprehensive Performance Test Doc No STEREO CIT 026 B 3 0 INSTRUCTIONS FOR USE Obtain a double sided hard copy of this procedure for record keeping during the test Refer to SEP GSE User s Manual on how to log in and set up GSE computers and run GSE software In this procedure all displays for data verification are based on a Linux PC either desktop or laptop which is commonly referred to as SEP GSE To command LET go to SEP Command Center window on SEP GSE Select ASCII Command option and enable LET CMD button Type LET command in CAPITAL letters Verify spelling before hitting the RETURN key Verify checksums and command responses in SEP Command Echo Monitor window on SEP GSE Monitor LET operation on GSE displays as instructed by the procedure 3 1 TEST SETUP REQUIREMENTS LET shall be installed on its bracket atop SEP Central Electronics box and set up on one of the following environmental test fixture clean flow bench or STEREO spacecraft LET data shall go to SEP GSE either directly or via IMPACT GSE Both GSEs shall be in their monitoring mode and mutually communicating before the test begins Boil off LN purge shall be continuously supplied to LET except during T V test Monitor flow daily LET sensor shall be double bagged in Ilumalloy bagging materia
4. above Quiet Mode procedure is complete Record its total running time and any observations or anomalies here UTC 2 2 6 Threshold Mode minimum running time 10 minutes 6a The following command puts LET in Threshold Mode by disabling Livetime stimulus pulse and running ADC pulser using a table of low DAC levels designed to bracket the ADC thresholds UTC LET gt THRMODE v echo UTC 6b Wait at least 2 minutes for new telemetry then use the same 2 D plots of L1 vs L2 and L1 vs L3 for both A and B sides of the telescope like in 5b V if OK 6c Monitor single detector rates in both 1 min Single Sample and Running Total accumulation display Snap LET page displays label and file them at the back of this procedure Compare 2 D plots event and rate page displays with reference samples Vif OK 6d Fit and analyze data off line Person s responsible for the analysis Pape amp Procedure for LET Comprehensive Performance Test Doc No STEREO CIT 026 B Analysis results will be available date location 6e The following command puts LET back in Normal Mode UTC LET gt NORMAL v echo UTC 6f If there are no anomalies above Threshold Mode procedure is complete Record its total running time and any observations or anomalies here UTC 2 2 7 LET Heater Mode minimum running time 5 minutes UTC 7a Record SEP main 28V supply current A UTC 7b Verify SEP main 28V supply voltage V 28V 7c The followi
5. within 5 seconds after power is turned on in order to capture SEP Central boot checksums ___ Vif OK and ready to continue UTC 1b Verify SEP Central checksums after booting 10 15 seconds following the power on On SEP Central FM1 unit verify these BOB _ 1018 93831D C Vif OK 1582 1918 51400A a 191D 1A37 9019 2412 4E38 F6EF2 RAM F4C232 PROMO F52F4B PROMI F52F4B BOTH EA5E96 On SEP Central FM2 unit verify these BOB 1018 93831D o v if OK 1582 1918 51400A _ 191D 1A37 9019 2412 4E38 F6EF2 RAM F4C232 PROMO 425E6F PROMI 1923DA BOTH 5B8249 UTC lc Verify SEP main 28V supply current A It can vary depending on how many SEP sensors are attached to SEP Central for LET alone 0 188A for LET HET FM1 0 196A for LET HET FM2 0 191A for complete SEP 0 252A If operating at cold the operational heaters will turn on off periodically and draw a predictable amount of extra current If SEPT is attached its operational heaters will cycle on off until Step 1f is executed UTC ld Verify SEP main 28V supply voltage V 28V le The following command returns address at the end of FORTH dictionary in SEP Central memory UTC SEP gt HERE Note there is a space between E and the dot 20024 Pape 4 Procedure for LET Comprehensive Performance Test Doc No STEREO CIT 026 B 1f The following command turns on bias voltages enables SEPT PDFE circuits and SEPT operational heater control and boots SIT HET a
6. Procedure for LET Comprehensive Performance Test Doc No STEREO CIT 026 B Record Local date Local time FM 1 S C A FM2 S C B UTC date UTC time Initials Temperature C Rel humidity List SEP sensors attached LET HET SIT SEPT E and SEPT NS Describe test set up configuration 1 0 INTRODUCTION 1 1 TEST NAME LET Comprehensive Performance Test 1 2 RESPONSIBLE SUBSYSTEM INSTRUMENT LEAD Branislav Kecman 1 3 AUTHOR Branislav Kecman 626 395 4264 kecman srl caltech edu 1 4 DATE CREATED October 4 2004 RevA January 19 2005 Checksum update and edit Rev B April 4 2005 Checksum update and edit 2 0 DESCRIPTION 2 1 PROCEDURE DESCRIPTION The procedure verifies comprehensive performance of the Low Energy Telescope LET sensor as part of Solar Energetic Particles SEP instrument suite before and after the following activities SEP bench and environmental tests SEP integration with the IMPACT suite IMPACT suite integration with the STEREO spacecraft S C environmental tests pre launch operations and in flight It exercises many aspects of LET operational modes and provides reliable means for their tracking over relatively long time period implied above 2 2 PROCEDURE OUTLINE AND DOCUMENT REFERENCE NUMBER 2 2 1 SEP Power On STEREO CIT 031 A 2 2 2 SEP Central Aliveness Test STEREO CIT 034 A 2 2 3 Normal Mode LET Aliveness Test STEREO CIT 024 A 2 2 4 ADC Only Mode 2 2 5 Quiet
7. TET TE TET TTT TE TET TET TE TET TE TET TET TEE TET TET TE EET EE Some examples of typical record keeping required in this procedure UTC Record UTC time on this line if available in the procedure step UTC time can be found on SEP GSE computer in the lower right corner Make sure to compare and synchronize personal watches with UTC time Verify that command echo was received on SEP GSE V echo Type command as shown below but without SEP gt prompt and record instrument response on the line provided Compare the response with the expected value given in parentheses SEP gt HERE Note there is a space between E and the dot 20024 FEA AE ETE AE ETE AEE AE AEE TE ETE AE ETE PE ETE PE ETE PETE TEE EAE EAE EAE AE EEE EEE ETE EEE HNH EEE Pape 3 Procedure for LET Comprehensive Performance Test Doc No STEREO CIT 026 B BEGINNIG OF EXECUTIVE PORTION UTC 2 2 1 SEP Power On STEREO CIT 031 A If SEP power is on and LET has already booted skip this procedure and go directly to 2 2 3 v if so UTC la Be sure that either lab P S or IMPACT GSE or S C power is properly connected to SEP Click on the preferred dice icon FM1 S C Ahead or FM2 S C Behind ____ on SEP GSE to start the corresponding software and establish proper data recording channel on GSE Enable data logging ___ _ v if OK open all SEP GSE displays windows of interest _____ v if OK and get ready to synchronize switching of SEP power and enabling of IDPU I F clock
8. ckets minute a V if OK LET 16 science packets minute or v if OK SEPT E 1 science packet minute v if OK SEPT NS 1 science packet minute i v if OK Beacon data 1 science packet minute mooi V if OK 2j Verify that SEP Unknown CCSDS Packet window is empty ___ vif OK If not record how many packets there are and their APID UTC 2k If there are no anomalies above SEP_Central Aliveness Test procedure is complete Record its total running time and any observations or anomalies here Pave 6 Procedure for LET Comprehensive Performance Test Doc No STEREO CIT 026 B UTC 2 2 3 Normal Mode LET Aliveness Test STEREO CIT 024 A 3a Open all LET displays on SEP GSE Use Single Sample for rate displays and arrange them on the same workspace screen In SEP Command Center window select LET_CMD button to prepare for sending commands to LET g if OK and ready to continue UTC 3b Record SEP main 28V supply current A 3c If SEP power was just turned on this step is unnecessary because LET starts up in Normal Mode Skip this step and go to 3d ___ Vif so If LET was previously in some other mode the following command will put it in Normal Mode by enabling slow ADC and Livetime stimulus pulsing UTC LET gt NORMAL echo 3d The following command returns address at the end of FORTH dictionary in LET memory UTC LET gt HERE Note there is a space between E and the dot 46120 3e The following command returns elapsed ti
9. edure Hard copies shall be filed in the CPT section of a three ring binder titled LET Functional Tests LET data shall be stored on SEP GSE and backed up immediately on another Linux PC Page 2 Proced ure for LET Comprehensive Performance Test Doc No STEREO CIT 026 B 4 0 SAFETY 4 1 HAZARDS OR WARNINGS Hazard Some sections of this procedure involve use of approved radiation sources that shall be handled by authorized LET team personnel Post signs to that effect in the test area to limit access Warning Although high voltage lines are NOT exposed various bias voltage lines inside LET can reach up to 250VDC 5 0 DATA ANALYSIS 5 1 TEST MEASUREMENTS LET measurements are made internally and displayed on SEP GSE for data analysis by LET team SEP GSE and off line computers shall be used to verify LET performance characteristics 5 2 APPROVAL PROCESS Discrepancies between expected and measured results shall be highlighted on the hard copy and brought to the attention of the responsible person s listed in Section 1 2 for eventual approval or disposition by the LET team 6 0 REFERENCE MATERIAL 6 1 REFERENCE DOCUMENTS 6 1 1 SEP GSE User s Guide 6 1 2 Test procedures listed in Section 2 2 If document no or is shown that means its executive portion is folded in the main procedure below 6 1 3 SEP GSE display snapshots used for LET functional test comparison purposes 6 2 REFERENCE DRAWINGS None TAIT TET ETT
10. l before being taken out of cleanroom 3 2 PARAMETERS REQUIRED In order to test LET operational heater at any given temperature the heater control parameter Set Point needs to be adjusted so that ambient temperature appears cold enough for the controller to start the heating This parameter is featured in Section 2 2 7 3 3 CRITICAL ACTIVITIES DO NOT send commands until LET representative conducting the procedure gives verbal OK In vacuum DO NOT power on SEP within the first 24 hours of reaching stable pressure of 10 torr In case of a vacuum loss LET power shall be immediately shut off via automatic relay 3 4 SPECIAL CONSTRAINTS OR ACTIVITIES LET apertures shall be protected by their red tag covers at all times except during environmental tests DO NOT touch exposed aperture windows and make sure nothing accidentally hits them while the covers are removed LET sensor weighs 0 85kg and sits on top of SEP Main Assembly which makes it top heavy Special care must be taken during stand alone testing to firmly attach SEP Main Assembly to the mounting surface in order to prevent accidental tipping 3 5 RECORDING REQUIREMENTS Prior to the execution of this procedure SEP GSE software shall be running data logging enabled and pertinent LET data windows and displays open on SEP GSE Test conductor shall follow the procedure steps and fill in the blanks on a hard copy of this procedure and snap GSE display windows as instructed by the proc
11. lete SEP 0 307A If operating at cold the operational heaters will turn on off periodically and draw a predictable amount of extra current UTC 8b Verify SEP main 28V supply voltage V 28V 8c If SEP is not operating in vacuum skip this step and go to 8e ___ vif OK If SEP is operating in vacuum and SIT HVPS is turned on the following command will bring the HVPS down gradually __utTc SIT gt hvpsoff echo UTC 8d Wait 30 seconds and record SEP main 28V supply current A UTC 8e Turn off SEP main 28V supply ___ vif OK UTC 8f Verify SEP main 28V supply current is zero A OA UTC 8g If there are no anomalies above SEP Power Off procedure is complete Record its total running time and any observations or anomalies here UTC LET Comprehensive Performance Test procedure is complete END OF EXECUTIVE PORTION Record the total running time and any observations or anomalies here Page 10
12. me in hours minutes seconds sub seconds since the last booting UTC LET gt TIME Note there s no space between E and the dot record 3f Verify that LET section of SEP Housekeeping display lower middle portion has no indication of yellow red limit violations for leakage currents and temperatures monitored Vif OK Record LET HK anomalies here 3g Verify that four LET temperature monitors are showing similar values within 1 C V if OK 3h If 2e skipped snap SEP GSE HK page display and file it at the back of this procedure v if OK 3i Compare HK page display with a reference sample Confirm there are no discrepancies Vif OK 3j Verify that 16 LET CCSDS packets minute with APID 580 are flowing regularly check either LET CCSDS Packet or LET Payload Telemetry Packet window V if OK 3k Verify that Unprocessed LET Science Packet window is empty Vif OK If not record how many packets there are and their APID 31 Snap LET page displays on SEP GSE and file them at the back of this procedure V if OK 3m Compare LET page displays with reference samples Check for stim box rates single detector rates and event totals by priority Confirm there are no discrepancies V if OK UTC 3n If there are no anomalies above LET Aliveness Test procedure is complete Record its total running time and any observations or anomalies here Page 7 Procedure for LET Comprehensive Performance Test Doc No STEREO CIT 026 B
13. nd LET sensors in that order Command responses consist of boot messages and checksums It takes about 60 seconds to execute if all four sensors are attached UTC SEP gt ALLONI for FM1 S C A or SEP gt ALLON2 for FM2 S C B e echo Verify that SIT has booted and SIT gt prompt was shown Verify that HET has booted and HET gt prompt was shown Verify that LET has booted and LET gt prompt was shown UTC 1g After LET has booted verify SEP main 28V supply current ___ Vif OK ____ Vif OK __ Vif OK A It can vary depending on how many SEP sensors are attached to SEP Central for LET alone 0 215A for LET HET FM1 0 228A for LET HET FM2 0 226A for complete SEP 0 307A If operating at cold the operational heaters will turn on off periodically and draw a predictable amount of extra current AF3 ____ 1000 10FC _ 12DC __ 12E6 __ 23FC 4876 937 __ 937F B428 _ 1D9DCA On LET FM2 unit verify these AF33 ___ 1000 10FC _ 12DC __ 12E6 __ 23FC _ 4876 _ 937F 937F _ B428 _ 1D88D4 li The following command sets various firmware flags in their proper state UTC SEP gt INITRCHK UTC lh Verify LET checksums On LET FM1 unit verify these 9197FF 990383 E2FAC3 F5487F 1ABF06 9197FF 990383 E2E5CD F5487F 1ABF06 UTC 1j If there are no anomalies above SEP Power On procedure is complete Record its total running time and any observations or anomalies here v if OK v if OK E V echo
14. ng command artificially raises LET operational heater control set point in order to enable the heater verification at room temperature UTC LET gt 50 TEMPGOAL v echo 7d Wait one minute for the command to take effect then watch for periodic increase in SEP main current that amounts to 0 030A 30mA 28V on LET FM1 or 0 022A 22mA 28V on LET FM2 Note that this predicted current increment is different if SEP main supply voltage is other than 28V UTC 7e Record the periodic peak value of SEP main 28V supply current A 7f Subtract 7a from 7e and record the result A The increment should agree with the amount predicted in 7d V if OK 7g The following command restores LET operational heater control set point to flight value 10 C UTC LET gt 157 TEMPGOAL v echo 7h Wait one minute for the command to take effect UTC 7i Record SEP main 28V supply current A If voltage is same as in 7b the current should go back to the same value as in 7a v if OK UTC 7j If there are no anomalies above LET Heater Mode procedure is complete Record its total running time and any observations or anomalies here Pape 9 Procedure for LET Comprehensive Performance Test Doc No STEREO CIT 026 B UTC 2 2 8 SEP Power Off STEREO CIT 032 A UTC 8a Verify SEP main 28V supply current A It can vary depending on how many SEP sensors are attached to SEP Central for LET alone 0 215A for LET HET FM1 0 228A for LET HET FM2 0 226A for comp
Download Pdf Manuals
Related Search