Agilent Technologies N1911A Bedienungsanleitung PDF herunterladen (Seite 11)

Graphical Example

A. System contribution to measurement uncertainty versus power level (equates to step 6 result/2)

Note: The above graph is valid for conditions of free-run operation, with a signal within the video bandwidth setting on the system.

Humidity < 70%.

B. Standard uncertainty of mismatch.

SWR r SWR r

1.0 0.00 1.8 0.29

1.05 0.02 1.90 0.31

1.10 0.05 2.00 0.33

1.15 0.07 2.10 0.35

1.20 0.09 2.20 0.38

1.25 0.11 2.30 0.39

1.30 0.13 2.40 0.41

1.35 0.15 2.50 0.43

1.40 0.17 2.60 0.44

1.45 0.18 2.70 0.46

1.5 0.20 2.80 0.47

1.6 0.23 2.90 0.49

1.7 0.26 3.00 0.50

Note: The above graph shows the Standard Uncertainty of Mismatch = rDUT. rSensor /√2, rather than the Mismatch Uncertainty

Limits. This term assumes that both the Source and Load have uniform magnitude and uniform phase probability distributions.

C. Combine A & B

Expanded Uncertainty , k = 2, = 2. U

= . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± %

System uncertainty contribution - 1 sigma (%)

1.0%

10.0%

100.0%

-35 -30 -25 -20 -15 -10 -5 0 5 10 15 20

Power (dBm)

N1921A: 500 MHz to 10 GHz

N1922A:18 to 40 GHz

Other bands

Standard uncertainty of mismatch - 1 sigma (%)

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0 0.1 0.2 0.3 0.4 0.5

Sensor

DUT

(Value from Graph A) + (Value from Graph B)

1 2 ... 6 7 8 9 10 11 12

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