GLAST LAT Project

3-4 May 2005

LAT LATEnvironmental EnvironmentalTest TestPlanning Planningand andDesign DesignReview Review 33-4 -4 May May2005 2005

EMI/EMC EMI/EMC

Michael MichaelN. N.Lovellette Lovellette

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

LAT EMI Test



LAT test levels derived from 433-RQMT-0005_RevA & LAT-SS-0778



Draft EMI/EMC Test Plan: LAT-MD-00276-02 – Use CAL EMI test procedure as template – LAT-PS-03929-03



Test Suite: – – – – – – – – –

CE102 Conducted Emissions, Power Leads, 10 kHz to 10 MHz, MIL-STD-462, CE03 CECM Conducted Emissions, Time Domain, 150 MHz Bandwidth CS102 Conducted Susceptibility, Power Leads, 10 kHz to 10 MHz, MIL-STD-462, CS02 CSCM Conducted Susceptibility, Common Mode, 30 Hz to 150 MHz, MIL-STD-462, CS02 CS06 Conducted Susceptibility, Spike, Power Leads, MIL-STD-462 RE101 Radiated Emissions, Magnetic Field, 20 Hz to 50 kHz RE102 Radiated Emissions, Electric Field, 10 kHz to 18 GHz, MIL-STD-461E RS101 Radiated Susceptibility, Magnetic Field, 20 Hz to 50 kHz RS103 Radiated Susceptibility, Electric Field, 30 MHz to 18 GHz

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

LAT Power Interfaces •

SC-LAT Power Interfaces – SC PRU (P) - LAT PDU – SC PRU (R) - LAT PDU – SC PRU (P) - LAT SIU (P) – SC PRU (R) - LAT SIU (R) – SC PRU (P) - LAT VCHP +Y – SC PRU (P) - LAT VCHP -Y – SC PRU (R) - LAT VCHP +Y – SC PRU (R) - LAT VCHP -Y – SC PDU (P) - LAT MAKEUP – SC PDU (R) - LAT MAKEUP

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Test Limitations •

Deviations from nominal test –

RS103 upper limit of 18GHz (40GHz)



Limited area of RS101 test • • •

Requires scanning each 10cm x 10cm area, ~16min/scan ~1450 scans for the LAT, another ~1200 for the radiators (~29 days) Scan selected locations around connectors, PMTs, BEA



LAT EGSE power supplies will be used for all EMI/EMC testing, no attempt will be made to duplicate expected characteristics of the S/V power



Limited B side conducted testing •



Emissions tests and susceptibility only where noted on A side

No heater circuit testing

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Open Issues



Replace CSCM as run for CAL EMI with MIL-STD 461E CS114 derived CSCM test



Update RE102 limits per proposal from Fred Blanchett

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

EMI Test Configurations •

Split EMI test – Conducted tests performed in the high bay integration area – Radiated testing performed in anechoic chamber



Conducted emissions and susceptibility tests with SIU and PDU do not require radiators, but do require good access to connectors

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Radiated Test Configuration

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

MGSE/STE for EMI/EMC Testing •



LAT (on the TIP) is mounted on the Test Stand for EMI/EMC testing – LAT + TIP mounts to Test Stand – Radiators are not yet integrated for this test, since they are not part of the EMI/EMC Test Plan – LAT is rolled into the anechoic chamber – Dust Tent remains over the LAT for the entire operation, including during testing Auxiliary cooling is needed during the test, since the LAT will be on for the entire test duration

Test Interface Plate

LAT

Radiators not yet integrated for this test

Test Stand

EMI/EMC Test Configuration LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

LAT Radiated Test Configuration

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

MGSE Requirements Flowing from EMI/EMC Test Plans • •





See the table, below, for a list of all MGSE/STE that is needed for conducting the EMI/EMC test Test Stand – Provides clear access around the perimeter of the LAT for positioning antennae during the test – Provides clear access directly under the LAT for positioning an antenna Dust Tent – Capable of providing clean, dry environment before/during/after EMI/EMC testing – Provides clearance around LAT – Does not impact the radiated emissions or susceptibility tests (must be essentially transparent to EM radiation in frequency range of tests) Chill Bars and Auxiliary Cooling system – Operated during the test

MGSE Assembly Test Interface Plate Ass'y Test Stand Dust Tent Chill Bars and Aux. Cooling

Use / Comments Mounts LAT to slip table/expander head Use with casters/jacks to move into chamber Covers LAT in un-regulated environment Cool LAT for pre-/post-test LPT's

MGSE/STE Needed for EMI/EMC Testing LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Auxiliary Cooling and Mechanical Handling •

Auxiliary cooling plans – LAT needs to be cooled during the entire duration of EMI/EMC testing • •

Chill Bars: one under each of the two X-wings on the Grid X-LAT Aux Cooling: using fly-away cooling lines already mounted to X-LAT Plate

This is room-temperature cooling to remove LAT process heat Fluorinert FC-77 working fluid is a dielectric, and hoses are non-conducting, so the chiller system will be electrically isolated from the LAT Handling and mechanical operating procedures – LAT lifting procedure – Test Stand handling and operating procedure – Dust tent handling and operating procedure – LAT auxiliary cooling system operating procedure – –



LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

MGSE Issues for EMI/EMC Testing •



Dust Tent – This is needed for EMI/EMC testing, because of the dirty conditions outside the test cell, and the potential for particulates to rain off the overhead anachoic foam – Dust tent will need to be designed to be essentially transparent to EM radiation in frequency range of tests Transportation issues – The EMI/EMC chamber is a long way from our high-bay “home base” •



Transportation route is circuitous and floor surfaces are of varying quality – Need to load-test a wooden trestle over abandoned railroad tracks – We plan to pathfind this route to ensure there are no problems in maneuvering the LAT

The EMI/EMC chamber has a ¾” door sill/threshold • •

We plan to build a ramp to roll up and over the sill This will definitely by prototyped with the pathfinder, since the LAT c.g. is moderately high

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Conducted Test Considerations •

Fully test: – SC PRU (P) - LAT PDU – SC PRU (P) - LAT SIU (P)



Limited test: – SC PRU (R) - LAT PDU – SC PRU (R) - LAT SIU (R)



Conducted susceptibility tests may require changing bus protection unit settings

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Conducted Test Harness •

Require access to power harness ~2 m from LAT I/F – CE102, CS102 (10kHz - 150kHz), CSCM (30Hz - 150kHz), CECM – All conductors of power circuit must be connected to a single 1/4” lug on line conditioner – All conductors must be gathered into a bundle so that a current probe may be connected around them



Require access to power harness ~5cm for LAT I/F – CS102 (150kHz - 150MHz), CS06, CSCM (150kHz - 150MHz) – Small bare section of a single conductor to attach clip lead for hf injection



EMI shielding not required on breakout harnesses



Harness specification in work – See R. Bielawski talk

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Radiated Test Harness •

No access to conductors required



Harness must be fully shielded – Includes all connector savers



Any test ports must be closed out or have shielded harnesses – “back door”



Test harnesses must be shielded – Accelerometers – TCs & thermistors



Harness supports not directly connected to the LAT should be nonconducting material, wood or PVC

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Grounding •

All LAT EGSE must be capable of ≤2.5mOhm connection to facility ground – BPU – VSC – Computers



Chiller must be connected to LAT via nonconducting tubing – Chiller chassis must be capable of ≤2.5mOhm connection to facility ground



LAT and or LAT MGSE must have ground points on all four sides capable of ≤2.5mOhm connection to facility ground – To obtain grid to ground ≤2.5mOhm

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Test Software •



Emissions Testing – Utilize the FSW Charge Injection Calibration function to inject charge into a large number of detectors. The number of channels into which charge can be injected will be limited by: a) FSW design (which is not yet complete); and b) The number of channels which can physically be injected with charge in any given one second cycle. The one second cycle is required to provide repeatability during the Emissions frequency sweeps. Susceptibility Testing: – A variation of the test described in the End-to-End (ETE) Test Plan, LAT-MD-03489, paragraph 2.2.1, item 4, "Nominal Rate Cosmic Ray Test" will be used. This test is run at ambient temperature and at nominal voltage, timing, threshold, and trigger configurations. Both Cosmics and the external trigger function are used to create onorbit trigger rates. The external trigger rate will be set so that the total trigger rate will be at or near the nominal expected on-orbit values. – The externally triggered events should have very low occupancy, monitor to see if occupancy goes up – The cosmic ray events should remain constant, monitor to see if rate goes up. –

Need real time continuous go/no go

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Test EGSE Software Tools •

Displays of natural trigger rates and occupancy of externally triggered events should be strip chart type



Other error status, checksum, etc. should latch

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

RE101 – All LAT Equipment

130 (20, 120)

120

Magnetic Field (dBpT)

110 100 90 80 70 60 50 40 1.E+01

(50K, 52)

1.E+02

1.E+03

1.E+04

1.E+05

Frequency (Hz)

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

RE102 - Integrated LAT

(18G, 53)

(10K, 44)

Notch GPS

Freq 1.55G 1.60G S-band 1.77G 2.30G

(2M , 8)

LAT Environmental Test PDR

dB Freq dB 32 1.55G 14 14 1.60G 32.2 33.2 1.77G 25 25 2.30G 34.5

(100M, 8)

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GLAST LAT Project

3-4 May 2005

CE102 Spacecraft PRU – LAT DAQ

90 (450K, 86)

(1M, 86)

(1.7M, 82)

Limit Level (dBuA)

80

(10K,80)

(350K,80)

70

(5.5M, 60)

60

(10M,60)

50 1.E+03

1.E+04

1.E+05

1.E+06

1.E+07

1.E+08

Frequency (Hz)

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

CE102 Spacecraft PRU – LAT SIU

90

(450K, 80)

(1M, 80)

80

Limit Level (dBuA)

(1.7M, 75)

70 (10K,68)

(350K,68)

60

(5.5M, 53)

50 (10M,48)

40 1.E+03

1.E+04

1.E+05

1.E+06

1.E+07

1.E+08

Frequency (Hz)

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Conducted Emissions Common Mode – All LAT Equipment

250

(DC,200)

(150M,200)

Limit Level (mV peak-peak)

200

150

100

50

0 1.E+00

1.E+01

1.E+02

1.E+03

1.E+04

1.E+05

1.E+06

1.E+07

1.E+08

1.E+09

Frequency (Hz)

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

RS101 Perform – BEA and Tracker Tower

160 150

(20, 142)

Magnetic Field (dBpT)

140 130 120 110 100 90 80 (50K,76)

70 60 1.E+01

1.E+02

1.E+03

1.E+04

1.E+05

Frequency (Hz)

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

RS103 Perform – BEA and Tracker Tower

Fre q 2.2825G - 2.2925G 14.9634 - 15043.4G

(30M , 20)

LAT Environmental Test PDR

V/m 38 40

(40G, 20)

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GLAST LAT Project

3-4 May 2005

CS102 Spacecraft PRU – LAT DAQ

90 (450K, 86)

(1M, 86)

(1.7M, 81)

Limit Level (dBuA)

80

(10K, 74)

(350K, 74)

70

60

(5.5M, 59) (10M, 54)

50 1.E+03

1.E+04

1.E+05

1.E+06

1.E+07

1.E+08

Frequency (Hz)

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

CS102 Spacecraft PRU – LAT SIU

90 (450K, 86)

(1M, 86)

(1.7M, 81)

Limit Level (dBuA)

80

(10K, 74)

(350K, 74)

70

60

(5.5M, 59) (10M, 54)

50 1.E+03

1.E+04

1.E+05

1.E+06

1.E+07

1.E+08

Frequency (Hz)

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Conducted Susceptibility Common Mode – All LAT Equipment

500

(DC,400)

(150M,400)

Limit Level (mV peak-peak )

400

300

200

100

0 1.E+00

1.E+01

1.E+02

1.E+03

1.E+04

1.E+05

1.E+06

1.E+07

1.E+08

1.E+09

Frequency (Hz)

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

CS06 Operate – All LAT Equipment

0.5E1

E1 = 20 Volts t1 = 10 usec +/- 20%

feed (Volts)

Transient imposed on instrument power

E1

t1

Time (usec)

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

CS06 Perform – All LAT Equipment

0.5E1

E1 = 5 Volts t1 = 10 usec +/- 20%

feed (Volts)

Transient imposed on instrument power

E1

t1

Time (usec)

LAT Environmental Test PDR

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GLAST LAT Project

3-4 May 2005

Action Items

EMI/EMC Test Action Item List Total Actions: 21 ID Test Action Item E100 EMI What to do about instrumentation wire in EMI test.

E101 E102

EMI EMI

E103

EMI

E104 E105

EMI EMI

E106

EMI

Define diagnostic testing to be done on LAT during EMI testing Verify that unit-level testing is being carried out, esp wrt LVDS testing (signal) Develop EGSE to terminate all test instrumentation (accel's, TC's) that penetrate EMI Shield Work out how to test heater control circuits during EMI testing Deliver LAT and SC ICD elec schematics for planning EMI testing

Michael Lovellette Gunther Haller Michael Lovellette

04/01/2005

Rich Baun

04/01/2005

Work to eliminate RF susceptibility test req at 18-40 GHz testing

E109

EMI

E110

EMI

E111 E112 E113 E114 E115

EMI EMI EMI EMI EMI

Define susceptibility detection methods, as part of LAT test script definitions for specialized LAT config's for EMI Chiller lines need elec break, and chiller needs to be outside chamber. Work out long runs for chiller lines Check that VSC cable plant is fully EMI-shielded with back-shells Work how to get LAT into chamber over 1/2" lip on door Develop routing of LAT to get to EMI chamber around RR tracks Develop CAD file of floor plan of EMI chamber Work out needed antenna orientations for developing MGSE and clearances Build clean tent for LAT in EMI chamber to keep it clean (look at GN2 purge for humidity) Provide details of breeakout cables and connector savers Evaluate EMI test data and plans for radiator unit testing. Needed to determine way ahead for radiator test, this testing is out of scope for LAT level EMI test Obtain power line monitoring equipment for conducted emissions and susceptability testing Verify ground locations on LAT for chamber ground on at least three sides

E119

EMI EMI

LAT Environmental Test PDR

Closed 2/15: to E109 Open 2/15: opened at Plan Mtg Closed 2/15: Will be shielded by a Cu bag or similar

03/15/2005

Work to geographically de-scope RS03 test

E120

Martin Nordby

Rich Bielawski

EMI

EMI

04/01/2005

Verify that existing LAT cables are adequate for EMI testing: taps, length, routing through chamber penetration

EMI

EMI EMI

Rich Baun Rick Bright

04/15/2005 03/15/2005

E107

E116

Actionee Brian Horwitz

Updated: 18-Feb-05 Printed: 02-May-05 Open Actions: 11 Status Comments/Disposition/Conclusions ECD Status Old ID 11/1/2004 Closed Part of STE definition. 3/15 Bag in copper bag to provide shielding. ET2-8 1/31/05 Additional shielding as required from Cu bad to LAT structure

Michael Lovellette Rich Bielawski

E108

E117 E118

Test Director: Michael Lovellette

04/01/2005

Martin Nordby

07/15/2005

Rich Bielawski Paul Dizon Paul Dizon Paul Dizon Michael Lovellette

04/15/2005 04/15/2005 04/15/2005 03/08/2005 03/08/2005

Closed 2/15: No heater testing planned Closed 2/15: opened at Plan Mtg Schematics and ICD sent to MNL and WNJ Closed 2/15: opened at Plan Mtg Rich Bielawsi indicates that all cables are shielded and of sufficient length, additional info required on breakout cables, see E117 Open 2/15: opened at Plan Mtg; Need to understand source of the req, but need to work this with Fred Blanchette Closed 2/15: opened at Plan Mtg; Logistics of doing this is daunting Concept presented 15 March Fred Blanchette in agreement, pending official confirmation with presentation of test plan Open 2/15: opened at Plan Mtg Open 2/15: baseline plan exists Closed Open Open Closed Closed

Martin Nordby

04/15/2005

2/15: The plan is for all to be shielded 2/15: opened at Plan Mtg 2/15: opened at Plan Mtg 2/15: opened at Plan Mtg PDF drawing exists 2/15: opened at Plan Mtg, Vertical configuration of LAT provides antenna access to all areas required Open 2/15: opened at Plan Mtg

Rich Bielawski Dave Nelson

4/22/2005 04/15/2005

Open 3/15: remaining details from E106 Open 3/15: no testing of VCHP heaters in baseline

Michael Obara

04/22/2005

Open 3/15: in work

Martin Nordby

04/22/2005

Open 3/15: opened at EMI test meeting

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