1. Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission
Particles and Fields Package
Pre-Ship Review
October 30,31, 2012
19: Magnetometer
Jack Connerney/Ron Oliversen

2. Jack Connerney/695 Dave Sheppard/564 James Odom/564 Steve Himes/322
Particles & Fields Package Pre-Ship Review Magnetometer October 30-31, 2012 UCB
Jack Connerney/695
Dave Sheppard/564
James Odom/564
Steve Himes/322
Ron Oliversen/695
Scott Murphy/695
Jared Espley/695
John Hawk/545

3. MAG: Magnetometer Investigation
What are MAG goals ?
Measure vector magnetic field
Characterize solar wind interaction
Support particles and fields package (ions, electrons, energetic particles & waves).
Where ?
Every orbit reaches below ~ 400 km at periapsis; “deep dips” probe to ~ 125 km.
Mission design provides broad coverage of solar wind and interaction regions (sheath, pileup region, wake).
Why ?
Together with other MAVEN instruments to understand present and past atmospheric loss
MAG Team:
Jack Connerney, Jared Espley, Dave Sheppard, Ron Oliversen, Jim Odom, Scott Murphy, Pat Lawton, John Hawk, Haydee Aguilar, Steve Himes & engineering support
Environment well understood
GSFC - Magnetometer

4. MAVEN Particles & Fields Package
SWEA
LPW (2)
Solar Wind Ion Analyzer (SWIA) – SSL
Solar Wind Electron Analyzer (SWEA) – CESR / SSL
Langmuir Probe and Waves (LPW) – LASP / SSL
LPW/Extreme Ultra-Violet (LPW-EUV) – LASP
Solar Energetic Particle Detector (SEP) – SSL
Magnetometer (MAG) – GSFC
Supra-Thermal and Thermal Ion Composition (STATIC) - SSL
LPW-EUVM
MAG
SWIA
SEP (2)
STATIC
MAG

5. MAVEN Particle and Fields Package
GSFC Provided
10cm
Two independent MAG sensors, electronics boards and a/c heaters;
Powered by two independent PFP power supplies.
Fully redundant hardware configuration. 5

6. MAG: a Heritage M. Acuña Fluxgate
Ring core fluxgate magnetometer (FGM)
–> 3 dynamic ranges:
+/- 65,536 nT
+/ nT
+/- 512 nT
0.015 nT resolution (16-bit A/D)
Goddard has flown similar fluxgates for 40 yrs.
MAVEN design is most similar to RBSP w/some Juno features (FPGA control w/ autoranging, housekeeping).
EEE parts are nearly identical to those used on Juno & RBSP (the same lots are being utilized)
GSFC - Magnetometer 6

7. MAG Team Mug Shots Jared Espley Science & GSE Jack Connerney
Instrument PI
Jim Odom
Senior Technician
Scott Murphy
Mechanical Engineer
Pat Lawton
Ground Systems
Ron Oliversen
Instrument Manager
Dave Sheppard
Systems Engineer

8. MAG Science Requirements
Requirement ID
Title
Requirement
Links from FRDs or Mission Requirements Document
Verification Method
Verified By TEST
Verified By INSPECTION / ANALYSIS
Verification Status
PF82
MAG Dynamic Range
MAG shall measure magnetic fields from 3 to 3000nT
MRD70, PF82
Analysis Test
Magnetometer dynamic range was measured during scale factor and offset verification, as detailed in the MAVEN Magnetometer Calibration Plan, MAVEN-MAG-PLAN-0114, section 4.0, Method #1. Scale factors are within 1% of the nominal Range 3 (65536 nT), Range 1 (2048 nT), and Range 0 (512 nT) full scale ranges. This provides MAG the opportunity to measure fields from < 1 nT up to nT.
The magnetometer is designed to operate over a dynamic range of < 1 nT to nT. This is detailed in MAVEN-MAG-SPEC-0015, section 17.
Verified
PF83
MAG Accuracy
MAG shall have an accuracy of better than 10% over its dynamic range
MRD71, PF83
Magnetic vector accuracy was measured during scale factor and offset verification, as detailed in the MAVEN Magnetometer Calibration Plan, MAVEN-MAG-PLAN-0114, sections 3.0 and During this test, MAG vector accuracy was established to better than 1%.
The magnetometer is designed to have an accuracy of better than 1% in all conditions over the specified dynamic ranges. This is detailed in MAVEN-MAG-SPEC-0015, section 25.
PF84
MAG Resolution
MAG shall have resolution of better than 10% over its dynamic range
MRD72, PF84
Magnetic vector resolution was measured during scale factor and offset verification, as detailed in the MAVEN Magnetometer Calibration Plan, MAVEN-MAG-PLAN-0114, sections 3.0 and The resolution was demonstrated to be better than 0.01%.
The magnetometer is designed to have an resolution of better than 1% in all conditions over the specified dynamic ranges. This is detailed in MAVEN-MAG-SPEC-0015, section 25.
PF85
MAG Time Resolution
MAG shall have time resolution of at least 20 seconds
MRD73, PF85
Test
The magnetometer samples the B field and telemeters data to the PFDPU at a rate of 32 Hz. This was verified during the MAVEN Magnetometer FPGA Checkout Procedure, MAVEN-MAG-PROC-0038, Sections 5.2 and The time resolution is measured at better than 0.04 seconds.
N/A

9. MAG Mini-PSR - 1
Purpose: Project review to determine that the magnetometers being delivered to UCB meet GSFC standards
When: May
Attendees:
Nick Jedrich / MAVEN Project
Jim Morrissey / MAVEN Project
Oscar Cheatom / GSFC Product Assurance
Dave Curtis / UCB
MAG Team (Jack Connerney, Jared Espley, John Hawk, Steve Himes, Scott Murphy, Ron Oliversen, Jim Odom, Dave Sheppard)
Results: Magnetometer meet or exceed specifications
MAVEN_MAG_PSR_slides.pdf
MAG PSR_approval to ship letter.pdf
Delivered to UCB: 21 May 2012
GSFC - Magnetometer

10. MAG Mini-PSR - 2 MAG Stand-alone Environmental Testing:
Sensor Thermal Balance (MAVEN-MAG-Test-0038)
Bracket/Sensor Vibration (MAVEN-MAG-RPT-0113)
Thermal Cycling (in air) & VTFMT
MAG Analog Electronics (MAVEN-MAG-RPT-0102)
AC Heater Electronics (ACHE) (MAVEN-MAG-TEST-0030)
Sensors (MAVEN-MAG-RPT-0102)
Calibration (MAVEN-MAG-RPT-0144)
Open Items (May 2)
WOA Closures
EIDP Completion: 5/18/2012
MAVEN-PFR-009 (Increase heater power): Closed 6/12/2012
ACHE 200 hours burn-in with transformer change:
Completed 5/9/2012 (MAVEN logbook pg. 25 – 29)
Instrument Level 4 Requirements are Verified (included in Backup Charts):
MAVEN-MAG-MTRX-0009_released_ xlsx

11. Thermal Balance/Modeling Results
The primary objective of this test was to validate the thermal model and temperature predictions for the magnetometer sensor
The test consisted of two balance points
Hot balance
Cold balance
After TB completion additional sensitivity tests were performed
Eclipse case simulated
Used the test data to validate the magnetometer sensor thermal model and updated flight temperature predictions using validated model and most recent spacecraft thermal model

12. Thermal Balance/Modeling Results
Balance Point Test Profile

13. Thermal Balance/Modeling Results
Initial Model to Test Result discrepancies revealed a missing heat leak (thermal node) in the model
Model predictions required more heater power (MAVEN-PFR-009)
Model Update yielded the Model Correlation Results (below)

14. MAG Sensor Temperature Predicts

15. Orbit Avg Heater Power @ 30V

16. Updated Heater Power Profile

17. Thermal Modeling Conclusions
Thermal model successfully correlated.
Flight predictions using the verified thermal model are well within the temperature limits and show adequate heater power margin with the new ACHE board.
MAVEN-MAG-TEST-0038

18. MAVEN MAG Power Summary
MAG FM POWER IS AS EXPECTED
ANALOG ELECTRONICS (MAD) POWER
POWER NUMBERS ARE THE SAME AS FOR THE EM1 THAT IS IN USE NOW AT SSL AND AS PRESENTED AT CDR
LOW FIELD (~1000 nT) POWER AT +/-13V IS 1.05W
POWER IN EARTH FIELD (~52k nT) AT +/-13V IS 1.16W
MAX POWER AT STARTUP (+/-13V, NO HFCLK FROM THE PFDPU) IS 1.34W
AC HEATER ELECTRONICS (ACHE) POWER
POWER HAS INCREASED TO ACCOUNT FOR AN UPDATED THERMAL MODEL (PFR-009).
OPERATES ON AN UNREGULATED BUS, +24V TO +36V
+24V MAXIMUM POWER IS 2.4W
+30V MAXIMUM POWER IS 3.8W
+36V MAXIMUM POWER IS 5.5W
5/2/2012
GSFC - Magnetometer 18

19. MAG Sensor & Bracket Mass (May 2012)
Component
CDR CBE + Cont.
CBE
Oct 4
2011
As weighed in Lab
Comments
Final FM
as weighed
May 1, 2012
FGM Sensor
390g
(incl. cable)
388g
(incl cable,
MAVEN top cover)
383g
(incl cable, top cover & base)
Includes assy. hardware
468g
Pigtail harness+connector
55g
166g
Adj to match measured cable
Incl. in sensor weight above
30” +- 1” length, shielded
EMI Cover
60g
86g
48g
Dec 2011
Clamshell design for EMI
(RBSP cover= 30g)
MLI Blanket
105 g
Feb 2012
CBE based on Blanket similar to RBSP
98g
Panel Mount Bracket
173g
122g
110g
Moved from G10 to Carbon Composite
80g
Sensor Totals
Sensor with Bracket, Cover, Cube & Fasteners
392g
No Cable or MLI included
Sensor with Bracket, Cover, Cable, Cube and Fasteners
620g
616g
MLI included
646g
NOTES:
CDR + Cont masses are presented for comparison.
As weighed configurations are similar but not equal to current design.
MAVEN-MAG-RPT-0141 19

20. MAVEN Mag Sensor and Bracket
½” Alignment Cube
IM-7 angle bracket
for cube
IM-7 Composite Bracket
with Ti inserts for fasteners
Mag Sensor with two piece T300 composite cover
(to be covered with Cu tape)
IM-7 Adapter Plate
(travels with Sensor
during testing) 20

21. MAVEN Mag Sensors & Fixtures
As delivered to UCB for integration, May, 2012 21

22. Mechanical Testing Summary (1)
Documentation:
WOAs
WOA-MAVEN-MAG-0172
WOA-MAVEN-MAG-0177
WOA-MAVEN-MAG-0178
Plans
MAVEN-MAG-PLAN-0150
MAVEN-MAG-PLAN-0151
MAVEN-MAG-PLAN-0152
MAVEN-MAG-PLAN-0153
MAVEN-MAG-PLAN-0154
Reports
MAVEN-MAG-RPT-0113
5/1/2012
GSFC - Magnetometer 22

23. Mechanical Testing Summary (2) Test Requirement (as per ERD/GEVS)
Test Article
Test Requirement (as per ERD/GEVS)
AXES
ERD /GEVS
Levels 1
Mass Model with EM Adapter Plate/Bracket
Random/Protflight/2min
Y, Z, X
15.6 Grms 2
EM Sensor with EM Adapter Plate/Bracket
Random/Protoflight/2 min per axis
Sine Burst (Proof) as per GEVS
30.91g
24.03g 3
FM001 Sensor Assembly
Random/Acceptance/1 min per axis
11.1 Grms 4
FM002 Sensor Assembly
Note: Sensor Assembly includes Sensor, Adapter Plate and Bracket.
5/1/2012
GSFC - Magnetometer 23

24. Mechanical Testing Summary (3)
Y axis
Random/Sine Burst
Z axis
X axis
Pass/Fail 1
15.58 Grms/ *
15.34 Grms/ *
15.67 Grms/ *
Pass
(Qualification) 2
15.56 Grms/30.98g
15.43 Grms/24.08g
15.55 Grms/24.0g
(Qualificaiton) 3
10.92 Grms/30.79g
11.02 Grms/24.23g
11.16 Grms/23.98g
(Acceptance/Proof) 4
11.15 Grms/31.0g
10.99 Grms/24.16g
11.18 Grms/24.11g
Notes:
Sine Burst was not performed on Mass Model
Static Load testing on the Mass Model/EM Bracket Assembly
Showed a composite yield limit at 1939 lbf (Y axis)
5/1/2012
GSFC - Magnetometer 24

25. Magnetometer Temperature Cycling
AC HEATER ELECTRONICS.
COMPLETED TEMPERATURE CYCLES & >200 HRS BURN-IN AT GSFC
COMPLETED TVAC WITH PFP PACKAGE AT UCB
ANALOG ELECTRONICS
COMPLETED TEMPERATURE CYCLING & >200 HRS BURN-IN AT GSFC
SENSORS
TEMPERATURE CYCLED AT GSFC IN AMBIENT, POWERED ON IN THE BLDG 34 LABORATORY
12 CYCLES
CYCLE C TO -35C
CYCLE 2 TO TO -20C
4 HOT/COLD STARTS, 4 HOUR SOAKS
1C/MIN TRANSISTION RATE
FILTER BOXES
169 HRS BURN-IN PRE-DELIVERY TO UCB; UCB TO COMPLETE BURN IN HRS
GSFC - Magnetometer 25

26. MAVEN MAG Calibration Timeline
FM1
THINSHELL
ZEROS
MAGSAT
3-SPIN
23FEB12 √
28FEB12
12MAR12
14MAR12
MARCH THERMAL BALANCE
18APR12
APRIL VIBRATION
19APR12
25APR12
27APR12
MAY 2-10 THERMAL CYCLES
14MAY12 X
15MAY12
FM2
13MAR12
MARCH THERMAL BALANCE
21MAR12
20APR12
30APR12

27. MAVEN MAG – MAGSAT Calibration
MAGSAT calibration method simultaneously solves for sensor scale factors, orthogonality, and coil system (facility) orthogonality, via a series of precise 90 degree rotations (sensor optical cubes with 10 arcsec accuracy and theodolites). 27

28. MAVEN Noise Performance
512 nT
dynamic range (R0)
2048 nT
dynamic range (R1)
65536 nT
dynamic range (R3) nT
Samples (sec/32)
Measured noise in Mu-metal shield can at magnetic test facility (includes environmental noise and instrument noise).
~ ±0.1 nT variation in both operational ranges 0 & 1 (<< 1 nT requirement L4-FGM-04).
Range 3 (Earth environment test and ATLO functionality only) noise is limited by the digital step size of the 16-bit A/D converter.

29. MAVEN FM Noise Performance
Measured at magnetic test site over the weekend
MAVEN Magnetometer Calibration Report: MAVEN-MAG-RPT-0145

30. MAVEN FM Noise Performance

31. MAVEN FM2 Calibrations Example
IDL> mcsum,DIR='MAVEN/FM2/15May12',RNG=3,/NRM
Magsat Analysis
range: 3 normalized
Fit RMS: 1.13
Run Time: Tue May 15 11:45:
zeros file: /Users/jackconnerney/idl/cal/MAVEN/FM2/15May12/zeros/mv_tt_ttp.txt
magsat file: /Users/jackconnerney/idl/cal/MAVEN/FM2/15May12/magsat/mv_tt_ttp.txt
facgrd file: /Users/jackconnerney/idl/cal/MAVEN/FM2/15May12/fac_grad/mv_tt_ttp.txt
zerotable:
scale factors:
sensor model amx:
symmetric part:
a-symmetric part:
rotation by: degrees
about unit vector:
< MAGSAT calibration method
File: /Users/jackconnerney/idl/cal/Maven/FM2/15May12/thinshellFM2.sts
Iteration:
Constraints:
Std. Dev.:
Zeros (x, y, z):
Scale factors:
Sensor model (symmetric) A Matrix:
continue?:
“thin shell” calibration method in box 31

32. ACHE Filter Boxes
UCB PFP EMI/EMC test found an EMI exceedance in conducted emission and conducted susceptibility
SSL & GSFC Trade Study concluded the best approach was to to add an external filter to the ACHE board
GSFC designed the filter & shipped breadboard to SSL
SSL tested the filter
One capacitor was added to design to meet specs
Final design was built & tested: MAVEN-MAG-TEST-0030
12 thermal cycles (GEVs)
169 hrs burn-in (additional 31 hrs at UCB)
Delivered to UCB to insert into I&T flow (10/25)
Installed, vibe tested & operational on PFDPU

33. Verification Matrix (FRD)
GSFC - Magnetometer

34. Verification Matrix (ERD)
GSFC - Magnetometer

35. Verification Matrix (ICD)
GSFC - Magnetometer

36. SMA and EIDP
Full EIDP for May 2012 MAG delivery and Filter Box Oct 2012 delivery is maintained at GSFC and posted on MAVEN MIS. Associated documentation (WOAs, etc., will not be printed as they are available on MIS).
A subset of the full EIDP is provided to UCB along with the hardware.
This set does not include the following:
Schematics
Reference designators on as-built
Any other information considered “PROPRIETARY”
Open Items:
WOA Closure (11/16/12)
GSFC - Magnetometer 36

37. MAVEN MAG Summary MAGs meet or exceed all specifications.
Need to finish run time hours on filter boxes (Oct 25, 2012) to be completed at UCB after integration.
Need to close-out paperwork (WOAs: 11/16/12).
FGMs delivered to UCB on May 21, 2012.
Filter boxes delivered to UCB on Oct 25, 2012.
Ready to support ATLO activities at LM
MLI delivery & installation to LM
Testing
Magnetic Screening

38. MAVEN MAG ADDENDUM
Level 4 Requirements Matrix from GSFC PSR (May 2012)
MAVEN-MAG-MTRX-0009_released_ xlsx

39. MAG Instrument L4 Requirements (1)

40. MAG Instrument L4 Requirements (2)

41. MAG Instrument L4 Requirements (3)

42. MAG Instrument L4 Requirements (4)

43. MAG Instrument L4 Requirements (5)