GLAST LAT Project
3-4 May 2005
LAT Environmental Test Planning and Design Review
3-4 May 2005
EMI/EMC
Michael N. Lovellette
LAT Environmental Test PDR
1
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
2
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
3
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
4
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
5
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
6
GLAST LAT Project
3-4 May 2005
Radiated Test Configuration
LAT Environmental Test PDR
7
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
8
GLAST LAT Project
3-4 May 2005
LAT Radiated Test Configuration
LAT Environmental Test PDR
9
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
10
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
11
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
12
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
13
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
14
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
15
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
16
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
17
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
18
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
19
GLAST LAT Project
3-4 May 2005
RE102 - Integrated LAT
60
(18G, 53)
Notch
GPS
Freq
1.55G
1.60G
S-band 1.77G
2.30G
50
(10K, 44)
Limit Level
(dBuv/m)
40
dB Freq dB
32 1.55G
14
14 1.60G 32.2
33.2 1.77G 25
25 2.30G 34.5
30
20
10
(2M , 8)
0
1.E+04
1.E+05
1.E+06
(100M, 8)
1.E+07
1.E+08
1.E+09
1.E+10
1.E+11
Frequency (Hz)
LAT Environmental Test PDR
20
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
60
(5.5M, 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
21
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
22
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
23
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
70
60
1.E+01
(50K,76)
1.E+02
1.E+03
1.E+04
1.E+05
Frequency (Hz)
LAT Environmental Test PDR
24
GLAST LAT Project
3-4 May 2005
RS103 Perform – BEA and Tracker Tower
60
55
Fre q
2.2825G - 2.2925G
50
14.9634 - 15043.4G
V/m
38
40
45
Limit Level
(V/m)
40
35
30
25
20
15
(30M , 20)
(40G, 20)
10
1.E+07
1.E+08
1.E+09
1.E+10
1.E+11
Frequency (Hz)
LAT Environmental Test PDR
25
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
26
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
27
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
28
GLAST LAT Project
3-4 May 2005
CS06 Operate – All LAT Equipment
E1 = 20 Volts
t1 = 10 usec +/- 20%
0.5E1
Transient imposed on instrument power
feed (Volts)
E1
t1
Time (usec)
LAT Environmental Test PDR
29
GLAST LAT Project
3-4 May 2005
CS06 Perform – All LAT Equipment
E1 = 5 Volts
t1 = 10 usec +/- 20%
0.5E1
Transient imposed on instrument power
feed (Volts)
E1
t1
Time (usec)
LAT Environmental Test PDR
30
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
Test Director: Michael Lovellette
Actionee
Brian Horwitz
Updated: 18-Feb-05
Printed: 02-May-05
Open Actions:
11
Status Comments/Disposition/Conclusions
ECD
Status
11/1/2004
Closed Part of STE definition. 3/15 Bag in copper bag to provide shielding.
1/31/05
Additional shielding as required from Cu bad to LAT structure
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
Rich Baun
Rick Bright
Michael Lovellette
Rich Bielawski
04/15/2005
03/15/2005
EMI
Verify that existing LAT cables are adequate for EMI testing: taps,
length, routing through chamber penetration
Rich Bielawski
03/15/2005
E107
EMI
Work to eliminate RF susceptibility test req at 18-40 GHz testing
EMI
Work to geographically de-scope RS03 test
Michael Lovellette
Gunther Haller
Michael Lovellette
04/01/2005
E108
E109
EMI
04/01/2005
EMI
Martin Nordby
07/15/2005
Open
E111
E112
E113
E114
E115
EMI
EMI
EMI
EMI
EMI
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
Open
Open
Closed
Closed
E116
EMI
Martin Nordby
04/15/2005
Open
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
2/15: opened at Plan Mtg
E117
E118
EMI
EMI
Rich Bielawski
Dave Nelson
4/22/2005
04/15/2005
Open
Open
3/15: remaining details from E106
3/15: no testing of VCHP heaters in baseline
E119
EMI
Michael Obara
04/22/2005
Open
3/15: in work
E120
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
Rich Baun
E110
Martin Nordby
04/22/2005
Open
3/15: opened at EMI test meeting
LAT Environmental Test PDR
04/01/2005
Martin Nordby
Old ID
ET2-8
Closed 2/15: to E109
Open 2/15: opened at Plan Mtg
Closed 2/15: Will be shielded by a Cu bag or similar
04/01/2005
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
2/15: baseline plan exists
31