1. EM pre-integration review
Double Star STAFF-DWP
EM pre-integration review

2. STAFF-DWP EM experiment units for EM pre-integration
Cluster DWP EM2, modified for Double Star.
Cluster MWF EM.
Cluster PWR EM.
Intra-Experiment harness for above.
Not included: STAFF-AMP and STAFF-ANT.
A feedback connector is provided to simulate AMP and ANT during functional tests.
Double Star STAFF-DWP EM pre-integration review

3. Double Star STAFF-DWP EM pre-integration review
MWF - DWP - PWR
Double Star STAFF-DWP EM pre-integration review

4. Double Star STAFF-DWP EM pre-integration review
DWP - MWF - PWR
Double Star STAFF-DWP EM pre-integration review

5. Deltas with respect to Double Star FM specification - DWP
The modified Cluster DWP unit for EM pre-integration conforms to Double Star specification only in respect of the PDMS electrical interfaces, command and telemetry formats.
The PEACE interface connector differs, although an adapter or compatible harness can be provided.
The analog interface to MWF (J08) is not present, although a dummy connector is fitted and this data is simulated in the telemetry.
The unit is not mechanically compatible with the Double Star specification.
Double Star STAFF-DWP EM pre-integration review

6. Deltas with respect to Double Star FM specification - MWF
The MWF EM unit is fully compatible with Double Star FM specification.
However, it cannot be mechanically stacked with the Cluster DWP, so will be provided as a separate unit.
Double Star STAFF-DWP EM pre-integration review

7. Deltas with respect to Double Star FM specification - PWR
The PWR unit is compatible with Double Star FM specification for electrical and mechanical interfaces.
The mass is somewhat reduced because radiation shielding required for Double Star is not present on this unit.
Double Star STAFF-DWP EM pre-integration review

8. Deltas with respect to Double Star FM specification - harness
The Intra-Experiment harness provided is of ‘bench test’ quality and is not representative of the flight harness.
Double Star STAFF-DWP EM pre-integration review

9. Modifications relative to Cluster status - DWP
Requires +/- 6V power for analog circuits (supplied by PWR).
HK and Science telemetry block sizes changed.
Minor changes to command parameters.
New software for FFT spectrum analyser mode.
Other Double Star modifications (mechanical interface, PEACE interface connector, MWF analog interface) are not implemented on the EM for pre-integration.
Double Star STAFF-DWP EM pre-integration review

10. Modifications relative to Cluster status - MWF
None.
Double Star STAFF-DWP EM pre-integration review

11. Modifications relative to Cluster status - PWR
The PWR for pre-integration is the Cluster EM with no modifications.
Flight models have a modified lid to the enclosure to increase mechanical strength.
Double Star STAFF-DWP EM pre-integration review

12. Modifications relative to Cluster status - harness
The PWR to DWP harness is modified from Cluster specification to supply +/- 6V to DWP analog circuits.
Double Star STAFF-DWP EM pre-integration review

13. Electrical test program
The complete STAFF-DWP experiment for EM pre-integration has been tested prior to delivery using the simulator of the Cluster WEC testbed.
Electrical interfaces to PDMS and PPD have been tested following the procedure defined by Roland Nord (based on the Cluster WEC integration procedure).
A functional test has been performed following the IST/AFT procedure (these two tests are basically the same for STAFF).
Double Star STAFF-DWP EM pre-integration review

14. Control file definition status - 1
Updated versions of control files provided to Imperial College on 26 July 2002.
Further update supplied on 8 August as a result of ambiguity in CHECK syntax.
Monitoring data base (HK parameters) updated during Beijing meeting, July 2002.
Double Star STAFF-DWP EM pre-integration review

15. Control file definition status - 2
Control files are provided for IST, AFT, SFT and IEL tests, with separate versions of each for nominal and redundant interfaces (8 total).
IST and AFT are the same except that AFT does not pause unless an error occurs.
SFT and IEL are a reduced version of the same test.
Files also provided for basic power ON/OFF functions, for use during electrical integrations.
Double Star STAFF-DWP EM pre-integration review

16. Electrical test setup - block diagram
Double Star STAFF-DWP EM pre-integration review

17. Electrical test setup (part of Cluster WEC testbed)
Double Star STAFF-DWP EM pre-integration review

18. Interface verification test
Electrical interface measurements performed on 25/26 July 2002.
Results sent to CSSAR on 6 August, and included in ADP.
DWP conforms to EID-A specification.
PWR conforms to EID-A specification except for minor non-conformance in grounding of synchro shield - no consequence for pre-integration.
OBDH simulator has several non-conformances from EID-A specification, but these should not invalidate measurements of experiment units.
Double Star STAFF-DWP EM pre-integration review

19. Interface verification test - representative screen shots
PWR inrush current
Current J mA/div
Voltage J V/div
Double Star STAFF-DWP EM pre-integration review

20. Interface verification test - representative screen shots
DWP HK telemetry bit pattern
Tlm Data
J10.3 2V/div
Tlm Clock
J10.5 2V/div
Double Star STAFF-DWP EM pre-integration review

21. Double Star STAFF-DWP EM pre-integration review
Bench level test
A functional test has been performed following the IST/AFT procedure.
Minor adjustments made to procedure to adapt to Cluster WEC TM formats.
Full test printout and charts are included in ADP.
Data available on ESTEC FTP server (archive file STAFF-DWP/data/T020805A.zip)
Experiment is working correctly and is compatible with control files provided.
Double Star STAFF-DWP EM pre-integration review

22. EGSE for pre-integration
STAFF-DWP will require two network connections, one each for CETP and Sheffield.
PARADISP software has been received from China, installed on DWP EGSE computer and verified using bench test data.
We also plan to adapt our own EGSE software to listen to DITS multicast data.
Double Star STAFF-DWP EM pre-integration review

23. Readiness for pre-integration
The STAFF-DWP EM experiment is ready for pre-integration.
Double Star STAFF-DWP EM pre-integration review

24. Outlook to FM status and schedule
All flight units except for DWP and harnesses are available now.
A DWP EM, fully compliant with Double Star specification is under development.
Mechanical enclosure is being manufactured.
Electronics design has been completed since January, but waiting for funding before manufacture starts.
Software is complete except for driver for new interface (and installed in Cluster DWP EM for pre-integration).
DWP FM delivery estimated at funding + 9 months.
Double Star STAFF-DWP EM pre-integration review