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THEMIS MISSION PRE-ENVIRONMENTAL REVIEW Probe 2 EMC Test Results David Curtis

THEMIS MISSION PRE-ENVIRONMENTAL REVIEW Probe 2 EMC Test Results David Curtis University of California - Berkeley. Probe 2 EMC Test Results. Launch Site Requirements Test in Launch configuration with instruments off RE02, RS03 per THEMIS ICD with Boeing Self Compatibility Requirement

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THEMIS MISSION PRE-ENVIRONMENTAL REVIEW Probe 2 EMC Test Results David Curtis

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  1. THEMIS • MISSION PRE-ENVIRONMENTAL REVIEW • Probe 2 EMC Test Results • David Curtis • University of California - Berkeley

  2. Probe 2 EMC Test Results • Launch Site Requirements • Test in Launch configuration with instruments off • RE02, RS03 per THEMIS ICD with Boeing • Self Compatibility Requirement • Test in plugs-out configuration with instruments on • RE02, RE04, RS03 per THEMIS Environmental Spec • Limit RE02 to science sensitivity band, 20Hz-1MHz, plus the probe receiver band 1.7-2.3GHz • Limit RS03 to probe transmitter band. Also power up transmitter to verify self-compatibility. • Test passed – see JPL test report 5132-06-035 • Test report reviewed and approved by KSC

  3. Probe 2 EMC Test Results • Launch Configuration RE02 Test Results • Well below spec 140-157udBV/m • Dominated by EGSE • Tallest peak ~56dBuV/m – see next page • Below spec at special frequencies: • 408-430MHz, ~30dBuV/m, spec = 38dBuV/m • 5.687 – 5.693GHz, ~54dBuV/m, spec = 95dBuV/m

  4. Probe 2 EMC Test Results

  5. Probe 2 EMC Test Results • Launch Configuration RS03 Test Results (20-40V/m) • The only sensitivity was the IRU, which saw significant fluctuations at 80MHz, 160MHz, 300MHz, 900MHz, and 1.108GHz (see next page) • At 1.108GHz found that IRU response returned to nominal at 7V/m. • IRU functionality is not important on the launch pad. Further, these frequencies do not correspond to any known frequencies at the Cape • JPL equipment could not test above 18GHz (spec was to 40GHz). 18GHz agreed to by KSC. • Post test functional showed no performance degradation in any system

  6. Probe 2 EMC Test Results • IRU RS03 sensitivity:

  7. Probe 2 EMC Test Results • Operational Mode (plugs out) RE02 test: • 20Hz-1MHz test indistinguishable from facility background • Facility significantly above spec line below 100Hz, as expected (below 14KHz measurement did not have a hard requirement) • Receive band (1.77-2.3GHz) did not show anything above the test equipment noise floor, which was below the THEMIS receiver sensitivity level. • Self compatibility tests indicate no problems in the probe receiver

  8. Probe 2 EMC Test Results • Operational Mode RE02 test

  9. Probe 2 EMC Test Results • Operational Mode (plugs out) RE04 test: • See exceedances at harmonics of 60Hz, etc. • see same exceedances in ambient measurement • Between chamber background peaks, easily meet THEMIS requirements, even at 0.5m from the probe.

  10. Probe 2 EMC Test Results

  11. Probe 2 EMC Test Results • Operational Mode (plugs out) RS03 test: • Only interested in probe transmit band. • See no effect from either the probe transmitter or from an external source at 30V/m

  12. THEMIS PROBE • MISSION PRE-ENVIRONMENTAL REVIEW • EMC/POWER • Peter Berg • University of California - Berkeley

  13. EMC/BATTERY/SOLAR ARRAY • CONDUCTED EMISSIONS TEST • BATTERY TRENDING • SOLAR ARRAY TEST

  14. Conducted CM • Common Mode Conducted Emissions Through Umbilical

  15. EMC SNIFF

  16. Sample EMC Sniff Probes 1- 5 BAU + IDPU + FGM + EFI + SCM + SST + ESA at J321 ESA HARNESS TO ESA

  17. Battery Trending Starting at 32 Volts, 850 mA was drawn from each battery for one hour.

  18. SOLAR ARRAY TEST A pair of 500 Watt Halogen Lamps was Placed orthogonally centered to each of the four flanking solar arrays at approximately 2 feet. The increase in solar array current from ambient light by string in mA was noted, and averaged below.

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