THEMIS INSTRUMENT SUITE FM 2FM 3 PRESHIP REVIEW

THEMIS INSTRUMENT SUITE FM 2/FM 3 PRE-SHIP REVIEW FM 4/FM 5 PRE-ENVIRONMENTAL REVIEW FGM Ellen Taylor for FGM Team THEMIS FM 2/3 IPSR and FM 4/5 IPER 1 UCB, November 10, 2005

Overview • • • Personnel FGM Flight Hardware Status FGM Open Items • FGM Backup Slides (presented at FM 1 PSR) • • Changes since FM 1 PER Environmental Qualification Summary Performance Testing Summary MRD Verification Summary THEMIS FM 2/3 IPSR and FM 4/5 IPER 2 UCB, November 10, 2005

FGM Personnel • Personnel – TU Braunschweig and IWF Graz – – – – Wolfgang Baumjohann Karl-Heinz Glassmeier (Head) Ulrich Auster (FGM TM) Werner Magnes (FGM Co. TM) Olaf Hillenmaier Ronald Kroth Markus Wiedemann THEMIS FM 2/3 IPSR and FM 4/5 IPER 3 UCB, November 10, 2005

FGM Status • Hardware Status – FGM calibration verified all requirements – 6 Flight Units of FGM Sensor (FGS) and FGM Electronics (FGE) have been delivered to UCB – Design verification through IDPU system occurs periodically during Instrument Suite Comprehensive Performance Tests. FGM sensor is quiet magnetic environment in THEMIS Calibration Unit (TCU) for these tests. THEMIS FM 2/3 IPSR and FM 4/5 IPER 4 UCB, November 10, 2005

FGM Open Items • FM 1 Open Item: FGM Sensor Swap • • • FM 2/FM 3 Open Items: None • • FGM Team would like to replace FM 1 Sensor (SN 04) with Flight Spare (SN 12) Requires 2 -3 days to recalibrate through IDPU system FGM team is currently on-site at UCB to perform re-calibration using Themis Calibration Unit (TCU) and to determine system noise and scale values Flight Spare sensor will require additional 6 cycles of Thermal Vacuum testing that was missed during Suite testing FM 2 (SN 01) and FM 3 (SN 02) FGM Sensors have been integrated to the Instrument Suite, gone through Suite Environmental Test, and are ready for Integration with the Probe FM 4/FM 5 Open Items: None • FM 4 (SN 03) and FM 5 (SN 05) FGM Sensors have been integrated to the Instrument Suite and are ready for Suite Environmental Test THEMIS FM 2/3 IPSR and FM 4/5 IPER 5 UCB, November 10, 2005

BACK-UP: THEMIS FM 1 FGM PSR/PER Presentation Changes since FM 1 PER Environmental Qualification Summary Performance Testing Summary MRD Verification Summary THEMIS FM 2/3 IPSR and FM 4/5 IPER 6 UCB, November 10, 2005

FGM Changes since FM 1 PER • FGM Part Change • • • Thermal Vac testing showed the FGM electronics had a temperature dependency of about 10 n. T/80 deg. C and that it was noisy at 60 deg. C With predicted temperature changes over orbit, temperature dependency affected FGM’s ability to meet MRD requirement IN. FGM-2: The absolute stability of the FGM shall be less than 1 n. T AD 648 parts were identified as not ideal for temperature stability and were replaced by RH 1013 Re-Work Instructions for exchange and Re-Test Report after exchange are included in FGM EIDP Folder #04 Replacement of parts improved temperature dependency to about 1 n. T/80 deg. C ensuring MRD requirement will be met. THEMIS FM 2/3 IPSR and FM 4/5 IPER 7 UCB, November 10, 2005

FGS qualification Vibration Specs. • • • Acceptance performed in Berlin Sine wave: up to 6. 4 g @ 50 Hz Random noise: 11. 7 g RMS TV-cycle • • Performed in Graz Two cycles between -120°C and 90°C Parameter check (before, between and after tests) • • Resistance of all coils / Sensor output signals Coil constants and mechanical alignment of feedback coil system THEMIS FM 2/3 IPSR and FM 4/5 IPER 8 UCB, November 10, 2005

Test performed with SN 4 digital functional test • • check of board population, FPGA and current sources Nov. 01. Berlin, THM_FGM_F 6 Startup. Test. doc analogue adjustment of FGS and FGE • • Test of excitation, input filter, phase adjustment, sensitivity and noise Nov. 05. Berlin, THM_FGM_F 4 Analog. Test. doc Parameters vs. electronics temperature • • Test of offset, sensitivity, inrush current, phase in dependency on e-temp. Nov. 06. Braunschweig, THM_FGM_Cal_F 4 e-temp. doc Parameters vs. sensor temperature • • Test of offset, sensitivity and noise in dependency on sensor temperature Nov. 14. Graz, THM_FGM_Cal_F 4 s-temp. doc THEMIS FM 2/3 IPSR and FM 4/5 IPER 9 UCB, November 10, 2005

Test performed with SN 4 test of non-linearity • • Test of DAC non linearity and filter characteristics Nov. 18. Graz, THM_FGM_Cal_F 4&F 6 linearity. doc Earth field registration • • Test of resolution and stability by comparison of F 4 and F 6 measuring Earth field variations Nov. 19. Jeserigerhütten, THM_FGM_Cal_F 4&F 6 Reg. JH. doc determination of sensor axis direction • • Direction of magnetic axis determined with respect to mechanical ref. frame Nov. 22. Jeserigerhütten, THM_FGM_Cal_F 4&F 6 Alignment. JH. doc determination of scale value and orthogonality • • Scale values and orthogonality check vs. sensor temp. in coil system Nov. 24 Magnetsrode, THM_FGM_Cal_F 4&F 6_MR. doc THEMIS FM 2/3 IPSR and FM 4/5 IPER 10 UCB, November 10, 2005

MRD requirements § The absolute stability of the FGM shall be less than 1 n. T Dependency on sensor temp. 2 n. T/170°C !!! Dependency on electronics temp. without feedback circuitry: with feedback circuitry: 1 n. T/80°C 10 n. T/80°C & (noisy at 60°C) Action: AD 648 identified as not ideal, replaced by RH 1013 • Temperature drift at maximum values of data sheet • noise at 60°C not specified in data sheet THEMIS FM 2/3 IPSR and FM 4/5 IPER 11 UCB, November 10, 2005

FGM Parameter The relative stability of the FGM shall be less than 0. 2 n. T/12 hrs THEMIS FM 2/3 IPSR and FM 4/5 IPER 12 UCB, November 10, 2005

FGM Parameter § The FGM noise level @ 1 Hz shall be less than 0. 03 n. T/sqrt(Hz) 0. 03 n. T/Sqrt(Hz) 0. 01 n. T/Sqrt(Hz) THEMIS FM 2/3 IPSR and FM 4/5 IPER 13 UCB, November 10, 2005

FGM Parameter The FGM digital resolution shall be less than 0. 1 n. T The FGM science range shall exceed 0 -1000 n. T Test shows Earth field variation with a resolution better 0. 1 n. T @ a back ground field of 12000 n. T THEMIS FM 2/3 IPSR and FM 4/5 IPER 14 UCB, November 10, 2005

FGM SN 4 Test Report FGE modification and re-tests done in Berkeley • • Exchange of amplifiers + Analogue checkout AD 648 replaced by RH 1013 No noise dependency on temperature anymore Temperature dependency with and without feedback circuitry about 1 n. T/80°C Design verification • • By SFT before and after each test step Check of commanding, different modes, noise and scale values Remaining tasks • • Verification of housekeeping values Spot shielding / removing of test points THEMIS FM 2/3 IPSR and FM 4/5 IPER 15 UCB, November 10, 2005