1. Solar Probe Plus – FIELDS Main Electronics Package
Instrument Pre-Environmental Review
Systems
Keith Goetz
University of Minnesota
2 February 2017

2. SPP/FIELDS MEP Two Sides Each has a Spacecraft I/F
Each has a Magnetometer
Each has Antenna Biasing
Each has a Power Supply
FIELDS1 also has
Data Controller Board
Radio Frequency Spectrometer
Digital Fields Board
SCM Calibration Control
Absolute Time Sequencer
TDS I/F
FIELDS2 also has
Time Domain Sampler
DCB I/F
SWEAP I/F
MEP

3. SPP/FIELDS Unchanged from CDR Five voltage sensors
V2 electric antenna
Unchanged from CDR
Five voltage sensors
Two Fluxgate magnetometers
One Search-Coil Magnetometer
Main Electronics Package
V3 electric antenna
MAGi, MAGo
MEP
V4 electric antenna
V5, SCM
V1 electric antenna

4. MEP – Buttoned Up

5. MEP Subsystems DCB – FIELDS1 TDS – FIELDS2 DFB AEB1/AEB2 MAGi/MAGo
DCB1 built and tested – gold soldering issues
DCB2 built and tested – ready for environments and flight
TDS – FIELDS2
TDS built and tested – ready for environments and flight
But some risk of FPGA overstress
DFB
DFB1 built and tested – issues with an ADC channel
DFB2 built and tested – ready for environments and flight
AEB1/AEB2
Built and tested – ready for environments and flight
MAGi/MAGo
LNPS1/LNPS2

6. FIELDS Sensors SCM V5 probe MAGi/MAGo V1234 antennas and preamps
FM1 built and tested – open circuit found in thermal cycling
FM2 is being built as replacement
V5 probe
Built and tested – ready for environments
Environmental testing on-going
MAGi/MAGo
Built and tested – ready for environments and flight
V1234 antennas and preamps
Design complete
EM success
Ready for final assembly, test and environmental

7. Instrument and Interfaces
ICD status with S/C
Still evolving and collecting information
i dotting and t crossing
Final mechanical interfaces (antennas) recently completed
No blocking TBDs
ICD status internal
No TBDs
Interfaces well tested on high fidelity EMs
Interfaces fully functional on FM
ICD status with SWEAP
Tested at EM level
Tests pending for FM

8. Changes Since CDR Rotated MEP on S/C 180 degrees
Simplifies harnessing
Finalized SWEAP interface
Tracked minor S/C changes

9. MEP Resources Resources are tracked continuously and reported monthly
V1234 caging elements removed mass (in favor of APL clamshells)
MEP power NTE reduced ~2W (with better measurements) at iCDR
Mass
MEP 7.64kg CBE 8.23kg NTE
FIELDS 17.59kg CBE 19.65kg NTE
MEP Power
FIELDS W CBE 14.44W NTE
FIELDS2 9.62W CBE 10.19W NTE
MEP 22.43W CBE

10. MEP Mass FIELDS Mass Tracking Report
current
FIELDS Instrument Suite
FLIGHT HARDWARE MASS
Subsystem/Component
Unit Mass, kg (CBE)
Total Mass, kg CBE
Contin- gency %
NTE Mass (kg)
5.1
FIELDS Instrument
5.1.1
Main Electronics Package (MEP)
Low Noise Power Supply (LNPS1)
1.035 9%
1.130 EM
MAGo Electronics
0.326 7%
0.350 FM
Data Control Board (DCB)
0.339 6%
0.361
Radio Freq. Spectrometer (RFS)
0.100
0.107
Antenna Electronics Board (AEB1)
0.322
0.343
Digital Fields Board (DFB)
0.392
0.420
Antenna Electronics Board (AEB2)
0.283
0.301
Time Domain Sampler (TDS)
0.444 8%
0.480
MAGi Electronics
0.324
Low Noise Power Supply (LNPS2)
0.814
0.864
MEP Chassis
2.961
3.200
MEP Internal Harnessing
0.303
0.320
MEP (excluding external harnessing)
7.64
8.23

11. Internal Grounding

12. Operational Grounding

13. FIELDS System Reviews iPDR 13 November 2013 All RFAs concurred
mPDR 15 January No RFAs
iCDR 13 January All RFAs complete
mCDR 16 March No RFAs
SOC CDR 16 June All RFAs concurred
iCDR FO 19 November 2015 All RFAs concurred
iPER SCM 10 November of 4 RFAs concurred
iPER V5 14 November of 9 RFAs complete
iPER MEP 2 February 2017

14. iCDR RFAs - FIELDS RFA Number Title Requestor Actionee Close Date
Concur Date
RFA # 1b
RFA #1, Part 2 - Thermo-Generated Currents
Brian Anderson
Keith Goetz
3/31/16
4/4/16
RFA # 2
Scrub and update FIELDS ICDs
Jeff Dolan
FIELDS
9/23/16
RFA # 3
Review final design of V1-V4 Antenna
Clint Apland
FIELDS Mechanical
6/11/15
11/16/15
RFA # 4
Additional details on Antenna mechanical design
6/10/15
RFA # 6
Stuctural margin documentation
Scott Gordon
8/20/15
9/18/15
RFA # 7
Thermal Properties
Bruce Williams
Thermal
6/9/15
7/7/15
RFA # 8
Thermal Modeling
Matt Reinhart
RFA # 9
Include Coax and Harness in Thermal Analysis
RFA # 10
V5 Antenna Hot Temperature Predictions
6/29/15
RFA # 11
Heater Switching effect on Science
5/25/15
9/10/15
RFA # 12
Heater Duty Cycle at 24 V
6/15/15
RFA # 13
Proximity of the V1234 Preamp Heaters
Thermal Mechanical
2/10/15
2/17/15
RFA # 14
Testing at ORNL
Tim Stephenson
Mechanical
2/13/15
3/6/15
RFA # 15
Tabulated Materials List for V1234
6/12/15
RFA # 16
FIELDS Interface Temperatures
6/30/15
RFA # 17
Magnetometer In-flight Calibration Plan
Bob MacDowall
3/3/15
RFA # 19
Zero-level Magnetic Field
5/27/15
RFA # 21
Stored Commanding Requirement for TDS
Mark Reid
RFA # 22
LNPS Loading Requirements
4/29/16
5/3/16
RFA # 23
Grounding
Ken Wagner
1/30/17
RFA # 24
Sine and Random Vibration Tests for V1234 with Whip
11/10/15
RFA # 27
Flow-down of SMA Requirements for the SCM
Teresa James QA
6/8/15
RFA # 28
Software Assurance Plan
Peter Harvey
3/9/15
RFA # 29
Configuration Control Plans
2/5/15
RFA # 30
Downlink Plan for Non-ideal Orbits
Matt Reinhart for N. Fox
7/6/15
7/20/15
RFA # 31
Detailed Analysis of the Schedule and Budget
Chris Stevens
7/8/15
8/17/15

15. iCDR RFAs - Project RFA Number Title Requestor Actionee Close Date
Concur Date
RFA # 1A
RFA #1, Part 1 - Thermo-Generated Currents
Brian Anderson
Carl Herrmann
3/31/16
4/4/16
RFA # 5
Evaulate impact of S/C dynamic response for V1234
Scott Gordon
Dave Persons
5/13/16
RFA # 18
Formalize the Magnetics Program
10/7/15
3/1/16
RFA # 20
Magnetics Decisions
Lena Adams
9/10/15
3/21/16
RFA # 25
Bake-out Temperatures
Bruce Williams
John Nicols
6/29/15
RFA # 26
First Motion Deployment of V1234 after S/C-Level Sine Vibration and Acoustic Testing
Annette Dolbow
4/3/15

16. iCDR FO RFAs RFA Number Title Requestor Actionee Close Date
Concur Date 1
Prior Action Item Status, slide 02-7
Matt Reinhart
Keith Goetz
2/1/17 2
Hinge Deployment Time/Velocity Margin, slide 03-19
Deva Ponnusamy
Glaser
3/17/16
4/29/16 3
Preamp Coaxial Cable Support, slide 03-28
3/18/16 4
Torque Margin Test Clarification, slides through 17
4/6/16 6
Pre-Amp Temperature Change, Systems, slide 06-7
Bruce Williams
Millan
3/21/16 7
Pin Puller Temperature, slide 06-7 8
Pin Puller minimum temperature, slides and 08-43 9
Materials Thermal Rating, slide 06-25

17. SCM iPER RFAs Title Requestor Actionee Complete Date Concur Date
AI #1 - Unfinished I-CDR action item
Doug S. Mehoke
Keith Goetz
12/14/16
12/15/16
AI #2 - Thermal testing - Survival test temp
Bruce Williams
Lora Suther
AI #3 - Steady State Heater Power Allocation
AI #4 - Thermal Balance Test

18. V5 iPER RFAs Title Requestor Actionee Complete Date Concur Date
AI #1 - Unfinished I-CDR action
Doug S. Mehoke
Keith Goetz
12/13/16
AI #2 - Sporadic oscillation and saturation of V1 sensor (and to a smaller exten
Jeff S Dolan
John Bonnell
AI #3 - D-subminiature pigtail connector cold temperature rating exceedance.
AI #4 - Belleville washes under antenna fasteners
Clint T. Apland
David Glaser
AI #5 - Contacts and preamp PWB
AI #6 - Thermal Analysis
Lora Suther
AI #7 - Micro Phase K usage
Carl Herrmann
AI #8 - Thermal Balance Test
AI #9 - V5 noise level
Kazue Takahashi

19. Waivers/Deviations

20. Problems UCB Item# Team STATUS Date CLOSED DISPOSITION
Title / Description
Instrument
SubSys
Sub Assy
001
UCB
CLOSED
5/26/16 1
SPP DCB - 3-D Plus SDL Workmanship
FIELDS
MEP
DCB/RFS
002
LASP
6/1/16
SPP DFB Sidecar ASIC Anomaly
DFB SN1
003
4/15/16
SPP AEB testing J32 Digital Input Overvoltage
AEB1, AEB2
004
1/9/17 3
DFB LASP
005
006
7/26/16
DCB/AEB HSK Anomaly (DCB Housekeeping Response)
DCB/RFS, FM1
007
VOID
TBD
008 5
MEP GND
009
10/31/16
DCB FM2 missing R47
DCB/RFS, FM2
010
RFS V1 Input Over-voltage
011
OPEN 4
SCM LF1Y Signal Loss
SCM
012
1/7/17
DCB Disconnected +6VA rail
013
1/26/17
DCB Signal Shorted to Ground
DCB FM2
014
1/31/17
GSE Short Circuit of 5V AEB1 Regulator
AEB1
015
UMN
TDS FPGA Daughter Board Alignment Pins
TDS
016
1/27/17
TDS Shows Corrupt Data
<next>

21. Performance MEP works like a charm
High reliability
F1 alone – F2 alone – F1 first and then F2 – F2 first and then F1
Persistent state
No drama
In general true from the start
We have had some issues and problems
Many hundreds of operating hours have been logged
Many hundreds of failure free hours on the various subsystems
MEP failure free hours start counting about now
We have had a few re-starts to the FFH counter
The most recent re-start was last Thursday (27 January)
TDS corrupt data problem
50 hours and counting

22. Documentation
Source: ftp://apollo.ssl.berkeley.edu/pub/FIELDS/1_Management/1.7_Meetings/PhaseC_ /MEP_PER/Documents/

23. Calibration
Co-I hardware institutions have delivered fully calibrated sub-assemblies
Fully calibrated and verified at home institutions – to front end
Simple calibrations at FIELDS I&T to verify and fill in gaps
For example: V1234 PAs, SCM, V5
As FIELDS is integrated at UCB
Several verification cals in ambient and at temperature as reference
Using external stimuli and/or isolation
Using sensor/probe isolation
Using flight hardware receivers – RFS, DFB, TDS and MAGs
Using flight hardware sensors
As FIELDS is integrated with spacecraft at APL
Same process
Using isolation and stimuli in ambient and S/C TV
As FIELDS enters/exits perihelion
Using SCM internal cal circuit
Calibration S/C rolls
Internal antenna bias sweeps

24. FIELDS Flight Configuration

25. FIELDS Bench CPT Configuration

26. FIELDS S/C CPT Configuration