Agilent Technologies 8510 Manuel d'utilisateur télécharger pdf (Page 29)

Appendix C

Cal coefficients model

Offset devices like offset shorts and offset opens can

be modeled by the following signal flow graph :

Figure 1 Signal flow graph model of offset devices

The offset portion of the open or short, is modeled

as a perfectly uniform lossy air dielectric transmis-

sion line. The expected coefficient of reflection, Γ,

of the open or short then can be solved by signal

flow graph technique.

Equation 1

The terms Z

, and are related to the cal

coefficients - Offset Z

, Offset Loss, and Offset

Delay - as follows:

Recall that

Equation 2

L ≈ L +

1 2 ... 24 25 26 27 28 29 30 31 32

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Agilent Technologies 8510 Manuel d'utilisateur Page 29