74 Chapter 5
Making Impedance Measurements
How to Display Impedance
How to Display Impedance
The following procedures show how to display impedance with the Linear
Magnitude format.
Step 1. Press .
Step 2. Press Conversion.
Step 3. Press Function.
Step 4. Press Z: Reflection to select the conversion to impedance from reflection
measurement.
Step 5. Press Conversion to turn ON the conversion function.
Step 6. Press .
Step 7. Press Lin Mag to select Linear Magnitude format.
The measured reflection coefficient is used to compute the impedance. The analyzer
uses the formula
where
Γ
= measured complex reflection coefficient and
where Z
sys
= 50 or 75
Ω
When the complex reflection coefficient, Γ, is zero, there are no reflections and the
cable under test will be exactly the same impedance as the system impedance, Z
sys
.
ZZ
sys
1 Γ+()
1 Γ–()
-----------------
⋅=
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