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DQDO\]HU,IZHLQVHUWDG%DWWHQXDWRUZLWKD6:5RIEHWZHHQSRUWWZRRIWKHQHWZRUNDQDO\]HUDQGWKHILOWHU
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DUT16 dB RL (.158)1 dB loss (.891)
Load match:
18 dB (.126)
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10 dB attenuator (.316)
SWR = 1.05 (.024)
.158
(.891)(.316)(.126)(.316)(.891) = .010
(.891)(.024)(.891) = .019
Directivity:
40 dB (.010)
Worst-case error = .010 + .010 + .019 = .039
Measurement uncertainty:
-20 * log (.158 + .039)
= 14.1 dB (-1.9 dB)
-20 * log (.158 - .039)
= 18.5dB (+2.5 dB)
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RL = 14 dB (.200)
RL = 18 dB (.126)
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Calibration Uncertainty
= (1 )S L
= (1 (.200)(.126)
= 0.22 dB
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Source match = 14 dB
(.200)
1
(.126)(.158) = .020
(.158)(.200) = .032
(.126)(.891)(.200)(.891) = .020
Measurement uncertainty
= 1 (.020+.020+.032)
= 1 .072
= + 0.60 dB
- 0.65 dB
DUT
1 dB loss (.891)
16 dB RL (.158)
Total measurement uncertainty:
+0.60 + 0.22 = +0 .82 dB
-0.65 - 0.22 = - 0.87 dB
Load match = 18
dB (.126)
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Measurement uncertainty
= 1 (.020+.0018+.0028)
= 1 .0246
= + 0.211 dB
- 0.216
Total measurement uncertainty:
0.22 + .02 = 0.24 dB
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= (1 )S L
= (1 (.0178)(.126)
= .02 dB
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dB (.126)
(.158)(.0178) = .0028
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Measurement uncertainty
= 1 (.006+.0005+.0028)
= 1 .0093
= 0.08 dB
Total measurement uncertainty:
0.01 + .08 = 0.09 dB
Calibration Uncertainty
= (1 )S L
= (1 (.0178)(.0366)
= .01 dB
Source match = 35 dB
(.0178)
1
(.0366)(.158) = .006
(.0366)(.891)(.0178)(.891) = .0005
DUT
1 dB loss (.891)
16 dB RL (.158) Effective load match = (.316 x .316 x .126 + .024)
= .0366 (28.7dB)
(.158)(.0178) = .0028
10 dB attenuator (.316)
SWR = 1.05 (.024 or 32.4 dB)
Analyzer load match =18 dB (.126)
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Total measurement uncertainty:
+0.44 + 0.22 = + 0.66 dB
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Measurement uncertainty
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= 1 .052
= + 0.44 dB
- 0.46 dB
1
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(.158)(.200) = .032
Source match = 14 dB
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dB (.126)
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