1. Solar Probe Plus – FIELDS Main Electronics Package
Instrument Pre-Environmental Review
Systems
Keith Goetz
University of Minnesota
10 April 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. MAG Boom – FM Test Fit

6. MEP Subsystems DCB – FIELDS1 TDS – FIELDS2 DFB AEB1/AEB2 MAGi/MAGo
DCB2 built and tested – ready for delivery and flight
TDS – FIELDS2
TDS built and tested – ready for delivery and flight
Some residual risk of data problems
DFB
DFB2 built and tested – ready for delivery and flight
Some small residual risk of data problems
AEB1/AEB2
Built and tested – ready for delivery and flight
MAGi/MAGo
LNPS1/LNPS2

7. 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 – environmental testing starting now
V5 probe
Built and tested – ready for delivery and flight
MAGi/MAGo
V1234 antennas and preamps
Design complete
EM success
Ready for final assembly, test and environmental

8. 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

9. Changes Since CDR Rotated MEP on S/C 180 degrees
Simplifies harnessing
Finalized SWEAP interface
Tracked minor S/C changes
TDS V5 is now AC coupled

10. 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 7.500kg CBE 7.83kg NTE
FIELDS 22.73kg CBE 19.65kg NTE (harnessing increase)
MEP Power
FIELDS W CBE 14.44W NTE
FIELDS2 9.62W CBE 10.19W NTE
MEP 22.43W CBE

11. MEP Mass FIELDS Mass Tracking Report
31 March 2017
FIELDS Instrument Suite #
FLIGHT HARDWARE MASS
Subsystem/Component
Flight Units
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
1.018 4%
1.059 FM
MAGo Electronics
0.327
0.340
Data Control Board (DCB)
0.339
0.353
Radio Freq. Spectrometer (RFS)
0.100
0.104
Antenna Electronics Board (AEB1)
0.324
0.337
Digital Fields Board (DFB)
0.392
0.407
Antenna Electronics Board (AEB2)
0.262
0.273
Time Domain Sampler (TDS)
0.437
0.454
MAGi Electronics
Low Noise Power Supply (LNPS2)
0.814
0.847
MEP Chassis
2.861 5%
3.000
MEP Internal Harnessing
0.303 6%
0.320
MEP (excluding external harnessing)
7.50
7.83

12. Internal Grounding

13. Operational Grounding

14. 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 of 15 complete (12 concurred)
iPER SCM 7 April 2017
iPSR MEP+ 10 April 2017

15. 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
2/2/17 
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

16. 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

17. 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

18. 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
3/24/17
3/28/17
AI #3 - Steady State Heater Power Allocation
AI #4 - Thermal Balance Test

19. V5 iPER RFAs Title Requestor Actionee Complete Date Concur Date
AI #1 - Unfinished I-CDR action
Doug S. Mehoke
Keith Goetz
12/13/16
3/21/17
AI #2 - Sporadic oscillation and saturation of V1 sensor (and to a smaller exten
Jeff S Dolan
John Bonnell
4/9/17
4/10/17
AI #3 - D-subminiature pigtail connector cold temperature rating exceedance.
3/27/17
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
3/20/17
AI #8 - Thermal Balance Test
3/24/17
AI #9 - V5 noise level
Kazue Takahashi
2/22/17

20. MEP iPER RFAs Title Requestor Actionee Complete Date Concur Date
AI #1 - Complete CPT
Jeff Dolan
Keith Goetz
2/16/17
4/3/17
AI #2 - CPT spreadsheet
Peter Harvey
2/11/17
AI #3 - Flight Software
Susan Ensor
3/15/17
3/16/17
AI #4 - SWEAP Interface definition
2/20/17
AI #5 - LPT
AI #6 - FPGA short
3/18/17
AI #7 - Heel fillets on DCB#2
Doug Mehoke
Lora Suther
3/9/17
3/17/17
AI #8 - Flight software
2/22/17
AI #9 - No SWEAP I/F testing in CPT performed In TV
AI #10 - Hi and Lo Bus voltage testing during TV
Bruce Williams
AI #11 - Cold Turn on in TV
Elisabeth Abel
Gayle Martin
4/10/17
AI #12 - No Mag heater testing during CPT during TV
AI #13 - Flight harnesses bypassing EMI
2/15/17
AI # 14 - Flight SCM bypassing EMI
AI #15 - MEP performance measures

21. Waivers/Deviations

22. 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
3/22/17
TDS Shows Corrupt Data
017
3/30/17
MEP Harness H110 Assembly Error
Harness
018
MEP LNPS overvoltage
LNPS
019
4/3/17
Whip Lead Weld Cracking
Antenna
020
Abnormal E-Field Signal Variation TVAC C6_H6
DFB
021
TDS time series 16k shift when cold
022
TDS Channel 4 D8 failure in cold
<next>

23. 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 operating hours
Starting on 4 January 2017, we have had ~240 operating hours
MEP failure free hours
We have had a few re-starts to the FFH counter
The most recent re-start was March first
LNPS1 overvoltage problem
Now ~118 hours

24. Environmental Testing
Started after PER
Full Vibe
MAG Sniffing
EMC
Here’s trouble – 10 February 2017
As part of conducted susceptibility testing (CS01)
Test calls for a 1 Vpp sine wave atop the S/C power bus
We inadvertently applied a much larger sine wave – tests suggest 70 Vpp
LNPS1 operational power supply failed instantly
Slice was returned to UMN
First stage 12V buck-coil converter was replaced – unit returned to full functionality
~20 EEE parts identified as possibly affected by the voltage extreme – replaced
Conformalled and inspected (via photography)
Temperature testing (in air)
Fully functional – all supply voltages matched previous calibrations
Failed part is out for DPA
Slice was returned to UCB and MEP
BB converter tested with a variety of torture
Part worked normally up to 70V but failed abruptly at 80V
Monitors on the 12V inner stage showed no trace of voltages above 12V
Further CS testing to be done on high fidelity EM

25. LNPS1 Repairs - Before

26. LNPS1 Repairs - During

27. LNPS1 Repairs - After

28. Environmental Testing
Resumed with TV
Penalty vibe
FIELDS – SWEAP FM-to-FM testing successful TV
Includes FM MEP, V5 inside chamber with MAGi and MAGo outside
Includes EM V1234 Preamps, non-flight SCM inside chamber
Includes SWEAP simulation outside chamber
Problem with GSE – heart-stopping but easily remedied
Anomalous Data Observed in TV
DFB
TDS – 16k shift
TDS – D8 stuck low
Captured as a Project level AR (SP-A-246)

29. DFB Time Series
Observed at final cold – hot cycle with 35V S/C bus voltage and MAG heaters running at full power
Was not seen after configuration changed

30. TDS 16k Observed at very cold turn-on temperatures
Went away as the board’s self-heating brought the temperature up
A design flaw in the commercial ADC (AD7621)
We’ll never be that cold

31. TDS Channel 4 D8 Observed at very cold turn-on temperatures
Went away as the board’s self-heating brought the temperature up
A likely workmanship problem – missed solder joint – D8 sometimes floating
We’ll never be that cold
Affects 1 channel of 5

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

33. 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

34. FIELDS Flight Configuration

35. FIELDS Bench CPT Configuration

36. FIELDS S/C CPT Configuration