Anritsu MA24104A, User Manual

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Uncertainty of a Measurement Using the Power Sensor
3-18 PN: 10585-00016, Rev. A MA24104A UG
Table 3-3. Measurement Uncertainty Examples
Uncertainty Term
Uncertainty
at +50 dBm
(%)
Uncertainty
at +10 dBm
(%)
Probability
Distribution Divisor
Adjusted
Uncertainty
at +50 dBm
(%)
Adjusted
Uncertainty
at +10 dBm
(%)
Measurement
Uncertainty
3.8 3.8
Normal at 2
σ
2 1.9 1.9
Noise
0.0 1.0 Normal at 2
σ
2 0.0 0.5
Zero Set
0.1 4.0 Rectangular 0.0 2.3
Zero Drift
0.0 1.2 Normal at 2
σ
2 0.0 0.6
Directivity Induced
Uncertainty
0.6 0.6 Rectangular 0.3 0.3
Source Mismatch
Uncertainty
1.3 1.3 Rectangular 0.8 0.8
Load Mismatch
Uncertainty
3.7 3.7 Rectangular 2.1 2.1
Effect of Digital
Modulation
0 0 Rectangular 0 0
Combined Uncertainty
(RSS)
Room Temperature
2.9 3.8
Expanded Uncertainty
with K=2
Room Temperature
5.9 7.6
Temperature
Compensation
1.4 1.4 Rectangular 0.8 0.8
Combined Uncertainty
(RSS, 0 to 50 °C)
3.1 3.9
Expanded Uncertainty
with K=2
(RSS, 0 to 50 °C)
6.1 7.8
Table 3-4. Noise Measurement Uncertainty Calculations
Noise Calculations at 50 dBm (100 W):
Noise 24 mW/100 W = 0.0%
Zero Set 68 mW/100 W = 0.1%
Zero Drift 20 mW/100 W = 0.0%
Noise Calculations at +10 dBm (10 mW):
Noise 100
μ
W/10 mW = 1.0%
Zero Set 398
μ
W/10 mW = 4.0%
Zero Drift 119
μ
W/10 mW = 1.2%
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