Transcript ppt charts

LAT EMI Test
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LAT test levels derived from LAT-SS-0778
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Use CAL EMI test procedure as template
– LAT-PS-03929-03
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Test Suite:
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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 Power Interfaces
• SC-LAT Power Interfaces
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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
Test Limitations
• 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
• Limited B side conducted testing
– Emissions tests and susceptibility only where noted on A side
• Limited VCHP htr testing
– Emissions only
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 z axis vertical to
provide access to LAT
connectors with 2m cable
lengths
LAT
Table
LAT MAGE
Radiated Test Configuration
Radiated Test Configuration
LAT Cable Feedthrough
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)
• Need to resolve operating constraints on VCHP htrs
– Can they be run for extended periods of time at ambient temp?
– Thermostatic overtemp protection
– Limited power, ~4W/circuit
• No plan to test PDU - LAT Makeup
– Thermostatic control, open circuit at ambient temp
• Conducted susceptibility tests may require disabling bus protection
unit
Conducted Test Harness
• Require access to power harness 2m 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 harnesses
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
Test Software
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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.
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Susceptibility Testing:
– A variation of the test described in the End-to-End (ETE) Test Plan, LATMD-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 on-orbit 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.
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
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
Frequency (Hz)
1.E+09
1.E+10
1.E+11
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
Frequency (Hz)
1.E+04
1.E+05
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
Frequency (Hz)
1.E+07
1.E+08
CE102 Spacecraft PRU – LAT SIU (IL), VCHP Heaters
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
Frequency (Hz)
1.E+07
1.E+08
CE102 Spacecraft PDU – LAT Anti-freeze and Make-up
Heaters
110
(10K, 106)
(1M, 106)
Limit Level
(dBuA)
100
90
(10M, 86)
80
70
1.E+03
1.E+04
1.E+05
1.E+06
Frequency (Hz)
1.E+07
1.E+08
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
Frequency (Hz)
1.E+06
1.E+07
1.E+08
1.E+09
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
Frequency (Hz)
1.E+10
1.E+11
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
Frequency (Hz)
1.E+04
1.E+05
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
Frequency (Hz)
1.E+07
1.E+08
CS102 Spacecraft PRU – LAT SIU (IL), VCHP Heaters
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
Frequency (Hz)
1.E+07
1.E+08
CS102 Spacecraft PDU – LAT Anti-freeze and Make-up
Heaters
120
(10K, 112)
(1M, 112)
Limit Level
(dBuA)
110
100
(10M, 92)
90
80
70
1.E+03
1.E+04
1.E+05
1.E+06
Frequency (Hz)
1.E+07
1.E+08
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
Frequency (Hz)
1.E+06
1.E+07
1.E+08
1.E+09
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)
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)
Back-up Slides
CE 102 LAT PDU – TPS (TEM, CAL, TRKR), EPU (IL),
GASU (ACD BEA, IL), PDU (IL)
120
(450K, 112)
(1M, 112)
110
(1.7M, 108)
(100K, 106)
(350K,106)
Limit Level
(dBuA)
100
90
(5.5M, 86)
80
(10M,80)
70
(10K,66)
(100K, 66)
60
1.E+03
1.E+04
1.E+05
1.E+06
Frequency (Hz)
1.E+07
1.E+08
CS102 LAT PDU – TPS (TEM, CAL, TRKR), EPU (IL),
GASU (ACD BEA, IL), PDU (IL)
90
(10K, 86)
(100K, 86)
80
Limit Level
(dBuA)
70
(450K, 58) (1M, 58)
60
(1.7M, 54)
(100K, 52)
50
(350K, 52)
40
(5.5M, 32)
30
(10M, 26)
20
1.E+03
1.E+04
1.E+05
1.E+06
Frequency (Hz)
1.E+07
1.E+08