MPEREMC 1 UCB, June 23, 2006 THEMIS MISSION PRE-ENVIRONMENTAL REVIEW Probe 2 EMC Test Results David Curtis University of California - Berkeley

MPEREMC 2 UCB, June 23, 2006 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 GHz Limit RS03 to probe transmitter band. Also power up transmitter to verify self-compatibility. Test passed – see JPL test report Test report reviewed and approved by KSC

MPEREMC 3 UCB, June 23, 2006 Probe 2 EMC Test Results Launch Configuration RE02 Test Results Well below spec udBV/m Dominated by EGSE Tallest peak ~56dBuV/m – see next page Below spec at special frequencies: MHz, ~30dBuV/m, spec = 38dBuV/m – 5.693GHz, ~54dBuV/m, spec = 95dBuV/m

MPEREMC 4 UCB, June 23, 2006 Probe 2 EMC Test Results

MPEREMC 5 UCB, June 23, 2006 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

MPEREMC 6 UCB, June 23, 2006 Probe 2 EMC Test Results IRU RS03 sensitivity:

MPEREMC 7 UCB, June 23, 2006 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 ( GHz) 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

MPEREMC 8 UCB, June 23, 2006 Probe 2 EMC Test Results Operational Mode RE02 test

MPEREMC 9 UCB, June 23, 2006 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.

MPEREMC 10 UCB, June 23, 2006 Probe 2 EMC Test Results

MPEREMC 11 UCB, June 23, 2006 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

MPEREMC 12 UCB, June 23, 2006 THEMIS PROBE MISSION PRE-ENVIRONMENTAL REVIEW EMC/POWER Peter Berg University of California - Berkeley

MPEREMC 13 UCB, June 23, 2006 EMC/BATTERY/SOLAR ARRAY CONDUCTED EMISSIONS TEST BATTERY TRENDING SOLAR ARRAY TEST

MPEREMC 14 UCB, June 23, 2006 Conducted CM Common Mode Conducted Emissions Through Umbilical

MPEREMC 15 UCB, June 23, 2006 EMC SNIFF

MPEREMC 16 UCB, June 23, 2006 Sample EMC Sniff Probes 1- 5 BAU + IDPU + FGM + EFI + SCM + SST + ESA at J321 ESA HARNESS TO ESA

MPEREMC 17 UCB, June 23, 2006 Battery Trending Probe12345 Δ V Starting at 32 Volts, 850 mA was drawn from each battery for one hour.

MPEREMC 18 UCB, June 23, 2006 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.