IDPU F1 Test Review FGM Fluxgate Magnetometer Michael Ludlam University of California - Berkeley

IDPU F1 Test Review FGM  Qualification FGS  Vibration and TV test levels  Parameters checked before and after tests  Test procedure after integration of FGE and FGS  8 test/calibration steps performed in Berlin, Braunschweig, Jeserigerhütten and Graz  FGE modification and re-tests done in Berkeley  Exchange of amplifiers  Analogue checkout  Design verification  Remaining tasks FGM F4 Test Report

IDPU F1 Test Review FGM  Vibration Specs.  Acceptance performed in Berlin  Sine wave: up to 50Hz  Random noise: 11.7g 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 FGS qualification

IDPU F1 Test Review FGM  digital functional test  check of board population, FPGA and current sources  Nov. 01. Berlin, THM_FGM_F6StartupTest.doc  analogue adjustment of FGS and FGE  Test of excitation,input filter, phase adjustment, sensitivity and noise  Nov. 05. Berlin, THM_FGM_F4AnalogTest.doc  Parameters vs. electronics temperature  Test of offset, sensitivity, inrush current, phase in dependency on e-temp.  Nov. 06. Braunschweig, THM_FGM_Cal_F4e-temp.doc  Parameters vs. sensor temperature  Test of offset, sensitivity and noise in dependency on sensor temperature  Nov. 14. Graz, THM_FGM_Cal_F4s-temp.doc Test performed with F4

IDPU F1 Test Review FGM  test of non-linearity  Test of DAC non linearity and filter characteristics  Nov. 18. Graz, THM_FGM_Cal_F4&F6linearity.doc  Earth field registration  Test of resolution and stability by comparison of F4 and F6 measuring Earth field variations  Nov. 19. Jeserigerhütten, THM_FGM_Cal_F4&F6RegJH.doc  determination of sensor axis direction  Direction of magnetic axis determined with respect to mechanical ref. frame  Nov. 22. Jeserigerhütten, THM_FGM_Cal_F4&F6AlignmentJH.doc  determination of scale value and orthogonality  Scale values and orthogonality check vs. sensor temp. in coil system  Nov. 24 Magnetsrode, THM_FGM_Cal_F4&F6_MR.doc Test performed with F4

IDPU F1 Test Review FGM  The absolute stability of the FGM shall be less than 1nT MRD requirements Dependency on sensor temp. 2nT/170°C !!! Dependency on electronics temp. without feedback circuitry: 1nT/80°C with feedback circuitry: 10nT/80°C & (noisy at 60°C) Action: AD648 identified as not ideal, replaced by RH1013 Temperature drift at maximum values of data sheet noise at 60°C not specified in data sheet

IDPU F1 Test Review FGM  The relative stability of the FGM shall be less than 0.2nT/12hrs FGM Parameter

IDPU F1 Test Review FGM FGM Parameter  The FGM noise 1Hz shall be less than 0.03nT/sqrt(Hz) 0.01nT/Sqrt(Hz) 0.03nT/Sqrt(Hz)

IDPU F1 Test Review FGM  The FGM digital resolution shall be less than 0.1nT  The FGM science range shall exceed nT FGM Parameter Test shows Earth field variation with a resolution better a back ground field of 12000nT

IDPU F1 Test Review FGM  FGE modification and re-tests done in Berkeley  Exchange of amplifiers + Analogue checkout  AD648 replaced by RH1013  No noise dependency on temperature anymore  Temperature dependency with and without feedback circuitry about 1nT/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 FGM F4 Test Report