Bird-technologies 5015 Series-Manual Instrukcja Użytkownika Pobierz pdf (Strona 22)

 Note: If a source with a 1.30:1 VSWR was

used instead, the mismatch uncertainty would be:

Using a lower VSWR source can drastically reduce the

mismatch uncertainty. Keep in mind that the typical

VSWR of the Model 5011 is 1.03:1, which gives a much

lower mismatch uncertainty.

Example - With the 1.50:1 source, the mis-

match uncertainty would be:

To determine the total uncertainty of the measure-

ment, combine the RSS uncertainty with the mis-

match uncertainty using the RSS method. Square the

RSS uncertainty, add it to the square of the mismatch

uncertainty, and take the square root.

Using Example 1 in Table 3 with a source VSWR of

1.50 and a TPS VSWR of 1.20, the total uncertainty

would be:

For example 2, the total uncertainty would be 6.82 %.

1.30 1–()1.30 1+()⁄ 0.130==

1.20 1–()1.20 1+()⁄ 0.091==

MU 1 0.130 0.091×+()

1–[]100 2.39±=×=

1.50 1–()1.50 1+()⁄ 0.200==

1.03 1–()1.03 1+()⁄ 0.015==

MU 1 0.200 0.015×+()

1–[]100 0.59±=×=

5.00

3.67

+6.20percent()=

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Bird-technologies 5015 Series-Manual Instrukcja Użytkownika Strona 22