1. Double Star: Experiment Activities
FM Experiment activities before delivery to the pre-integration site (Acceptance level for Cluster FS)
Manufacturing finalised
Functional test
Dimensional measurements (mounting foot pattern etc) and physical properties (mass, CoG, MoI)
Electrical interface verification with the satellite simulator
Mechanical acceptance testing (low level sine, random vibration, partly also shock loads)
Thermal vacuum acceptance test
Calibration (in vacuum for PEACE, HIA, ASPOC, NUADU)
EMC test (conducted emission / susceptibility
Issue of Acceptance Data Package (ADP) comprising the ESA standard points and all the test results
Review of ADP
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Double Star Mtg, CSSAR, Beijing, 1 to 7 July Page 1
Roland Nord

2. Double Star: Experiment Activities
FM Experiment activities at delivery to the pre-integration site (Acceptance level for Cluster FS)
Incoming inspection (visual check for outer potential damage, for thermal finish, mech. Interfaces)
Functional Test with S/C simulator (Satellite Services model)
DC magnetic properties (tbd)
Mass properties (flatness, mass (without red tag items), etc)
Pre-integration Readiness Review prior to integration activities
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Double Star Mtg, CSSAR, Beijing, 1 to 7 July Page 2
Roland Nord

3. Double Star: Experiment Integration
Pre-Integration
Baseline of for I/F Measurements
The Interface verification between Double Star PDMU (EM / FM) and Experiments shall be made manually (using scopes and multimeters)
Use of the modified and updated Cluster II integration procedures (now available as “Word”-files adapted to the Double Star needs as far as the information was available)
Use of the Central Check-out System (DITS) loaded Double Star data base as well as the compiled experiment and satellite control files
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Roland Nord

4. Double Star: Experiment Integration
Pre-Integration (cont’d)
Baseline of for I/F Measurements
Planned measurement program.
1 Bonding Resistance Check
2 Pin Grounding Continuity Check
3 Unconnected Harness Check for dangerous voltages potentially emerging from PDMS (all PDMS subsystems running but no interface connector is plugged in)
4 Power Interface Check (in-rush current, current level,
converter synch characteristic)
5 Signal and Command I/F-Check
6 Inter Experiment Link I/F-Check (check for dangerous
voltages only)
7 Integration Status Check (all connector saver removed and the I/F connector I/F secured
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Double Star Mtg, CSSAR, Beijing, 1 to 7 July Page 4
Roland Nord

5. Double Star: Integration Issues
Preconditions for the Integration Start
Following test activities or deliverables have to be performed prior to the experiment integration
PDMS acceptance test incl. test protocols etc made available well before the start of the pre-integration (4 weeks) (satellite contractor)
Functional performance
Interface characteristics when the output / inputs are loaded with the nominal impedances as given in the EID-A
Main bus impedance measurement
The PDMS-experiment harness and IEL continuity test incl. test protocols (satellite contractor)
Intra experiment harness continuity check (experimenter)
Availability of a complete and debugged set of control files for
the switching of the PDMS / satellite functions
the switching of the experiments
which are compiled on the Central Check-out Computer
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Double Star Mtg, CSSAR, Beijing, 1 to 7 July Page 5
Roland Nord

6. Double Star: Integration Issues
Information needed to continue Pre-integration
preparation:
S/C Command Sequences / Control Files for
S/C switch-on
power up dedicated experiments
Switch into Primary mode
Switch into Redundant mode
Cross coupling
Command Spin Rate Change
are needed to prepare the electrical integration
procedures properly.
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Double Star Mtg, CSSAR, Beijing, 1 to 7 July Page 6
Roland Nord