EMC test report
WBS QM EMC test report
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1Document Change Record
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Table of Contents (1)
1DOCUMENT CHANGE RECORD (2)
2DOCUMENT REFERENCES (4)
2.1A PPLICABLE D OCUMENTS (4)
2.2R EFERENCED D OCUMENTS (4)
3INTRODUCTION (5)
4EIT-01 (POWER) (6)
5EIT-02 (DATA/HK INTERFACE) (7)
6EIT-03 (ZERO & COMB) (9)
7OPT-03 (ATTENUATOR STEP SIZES) (11)
8PET-01 (COMB ANALYSIS) (12)
9CS ON POWER LINES / COMMON AND DIFFERENTIAL MODE (13)
10CS ON SIGNAL LINES / COMMON MODE (15)
11CS TRANSIENTS ON POWER LINES (16)
11.1C OMMON MODE (16)
11.2D IFFERENTIAL MODE (18)
12RS WITH E-FIELD (20)
13RS WITH H-FIELD (23)
14SUMMARY OF TEST RESULTS (24)
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2Document References
2.1Applicable Documents
2.2Referenced Documents
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3Introduction
The WBS-QM EMC test was performed between 5th and 8th July 2004 at GEDIS in Kiel. Participants:
Oliver Siebertz (KOSMA)
Boris Kopf (KOSMA)
Peter Boerner (MPAE)
Walter Boogarts (MPAE)
Eckhard Steinmetz (MPAE)
Peter Sell (Gedis)
General test conditions:
?The EMC test procedure is given in AD-03
?For a description of the test setup and equipment see AD-02
?No temperature stabilization was used during the WBO and WBE function and performance verification. As a consequence the stability of the WBS was rather poor.
Even integrations with 200 scans (2 sec) showed a degradation of the radiometric performance. Nevertheless the baseline analysis using procedure PET-07 was still possible.
?Dedicated test harness instead of the QM harness.
?Additional tests which are not discussed here can be found in AD-05.
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4EIT-01 (Power)
The power consumption was verified at the test facility before and after EMC testing. Test conditions:
?EGSE #2
?Breakout box and LISN ?Power cable 8m
?Supply voltage 26 V at WBE input
?Current scaling factor EGSE #2 - AGILENT power supply: 0.9?
Measurement accuracy is app. ± 0.005
?Conclusion: All variations are within the measurement accuracy.
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5EIT-02 (Data/HK Interface) Test 1 (main interface & redundant interface):
Test 2:
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Test 3:
This verification was done only after EMC testing.
?Conclusion: Unit fully functional after test.
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6EIT-03 (Zero & Comb)
All numbers below are ADC counts scaled to a single readout (CCD/ADC saturation level is 1024 counts).
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152025303540
45I l l u m i n a t i o n [c o u n t s ]
Pixel number
Laser 1 pre Laser 1 post
Figure 1: IF zero level measured with laser 1 before and after EMC testing.
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I l l u m i n a t i o n [c o u n t s ]
Pixel number
Laser 2 pre Laser 2 post
Figure 2: IF zero level measured with laser 2 before and after EMC testing.
?Conclusion: The EMC test has no significant impact on subband efficiency and ripple. The measured changes are probably due to the different temperatures of the WBS during the measurement.
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7OPT-03 (Attenuator step sizes)
The attenuator step sizes are measured with laser 2.
Measurement accuracy is app. ± 0.1 dB.
Pre EMC measurement:
2004-07-05 10:02:13: MAIN step 1: 1.41 1.58 1.40 1.52 <1.48> [dB] 2004-07-05 10:02:13: MAIN step 2: 2.52 2.75 2.53 2.53 <2.58> [dB] 2004-07-05 10:02:13: MAIN step 4: 5.13 5.42 5.36 5.36 <5.32> [dB] 2004-07-05 10:02:13: MAIN step 8: 8.74 9.02 9.10 9.25 <9.03> [dB] 2004-07-05 10:02:13: SUBB step 1: 1.43 1.15 1.42 1.47 <1.37> [dB] 2004-07-05 10:02:13: SUBB step 2: 2.51 2.46 2.73 2.85 <2.64> [dB] 2004-07-05 10:02:13: SUBB step 4: 4.74 4.96 5.22 5.28 <5.05> [dB] Post EMC measurement:
2004-07-07 16:43:09: MAIN step 1: 1.42 1.56 1.39 1.59 <1.49> [dB] 2004-07-07 16:43:09: MAIN step 2: 2.55 2.72 2.51 2.58 <2.59> [dB] 2004-07-07 16:43:09: MAIN step 4: 5.16 5.37 5.33 5.34 <5.30> [dB] 2004-07-07 16:43:09: MAIN step 8: 8.80 8.96 9.06 9.14 <8.99> [dB] 2004-07-07 16:43:09: SUBB step 1: 1.50 1.14 1.43 1.48 <1.39> [dB] 2004-07-07 16:43:09: SUBB step 2: 2.59 2.44 2.73 2.83 <2.65> [dB] 2004-07-07 16:43:09: SUBB step 4: 4.84 4.93 5.21 5.23 <5.05> [dB]?Conclusion: No significant changes measured.
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8PET-01 (Comb analysis)
The performance verification was done with the internal comb generator. Measurement accuracy: Efficiency app. 5% / Resolution ±0.1 MHz / center pixel 1 Pre-EMC measurement:
2004-07-05 10:02:14: Thermistor 1 (CCD) 22.39 °C
2004-07-05 10:02:14: Thermistor 2 (Laser) 24.83 °C
2004-07-05 10:02:14: Thermistor 3 (ADC Board) 26.65 °C
Post-EMC measurement:
2004-07-07 16:44:04: Thermistor 1 (CCD) 24.95 °C
2004-07-07 16:44:04: Thermistor 2 (Laser) 27.90 °C
2004-07-07 16:44:04: Thermistor 3 (ADC Board) 31.67 °C
? Conclusion: No significant changes of subband efficiency. The small variation of the efficiency and the center channel is probably caused by the temperature difference.
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9CS on power lines / common and differential mode
A range between 30 Hz to 50 MHz was tested at discrete frequencies.
The test procedure PET-07 (see AD-01) was used to determine the impact of a synchronous distortion for the RMS value of the 4-8 GHz baseline (Sig-Ref)/(Ref-Zero). The test setup is described in AD-03 and AD-04.
Figure 3: RMS value of the baseline for power line distortions in common
mode at various frequencies (integration time was 2 sec). The
blue line marks the result of the reference measurement.
Figure 4: RMS value of the baseline for power line distortions in differential
mode at various frequencies (integration time was 2 sec). The blue
line marks the result of the reference measurement.
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?Conclusion: No baseline distortion measured for the common mode distortions. A 10% increase of the baseline RMS was visible in the range 1-10 kHz for the differential mode test.
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10CS on signal lines / common mode
A range between 30 Hz to 50 MHz was tested at discrete frequencies. The impact on the Data/Command and RF interface was verified together.
The test procedure PET-07 (see AD-01) was used to determine the impact of a synchronous distortion for the RMS value of the 4-8 GHz baseline (Sig-Ref)/(Ref-Zero). The test setup is described in AD-03 and AD-04.
Figure 6: RMS value of the baseline for signal line distortions in common mode
at various frequencies (integration time was 1 sec). The blue line marks
the result of the reference measurement.
? Conclusion: No baseline distortions measured.
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11CS transients on power lines
The test procedure PET-07 (see AD-01) was used to determine the impact of the transients on the RMS value of the 4-8 GHz baseline (Sig-Ref)/(Ref-Zero). The test setup (described in AD-03 and AD-04) did not allow a synchronous distortion. In addition to the baseline analysis the CCD zero level was measured to improve the sensitivity of the verification.
11.1Common mode
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11.2Differential mode
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?Conclusion: No baseline and CCD zero level distortions measured.
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12RS with E-field
A range between 14 kHz to 18 GHz was tested at discrete frequencies.
The test procedure PET-07 (see AD-01) was used to determine the impact of a synchronous distortion for the RMS value of the 4-8 GHz baseline (Sig-Ref)/(Ref-Zero). The test setup is described in AD-03 and AD-04.
Figure 11: RMS value of the baseline for E-field radiation with 2V/m RMS at various
frequencies (integration time 1 sec). The blue line marks the result of the reference
measurement.
A further analysis was done to investigate if spurious signal appear in the spectra. Therefore the maximum level of a single frequency pixel in each 4-8 GHz spectra was divided by the RMS value of the baseline. The radiated E-field of 2V/m does not generate any spurious signals above 5 times the RMS value at the measured frequencies.
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