Technical data

5-13
Operating Concepts
Analyzer Display Formats
In a transmission measurement, the data can be converted to its equivalent series impedance or
admittance using the model and equations shown in Figure 5-4 on page 5-13.
Figure 5-4. Transmission Impedance and Admittance Conversions
NOTE Avoid the use of Smith chart, SWR, and delay formats for display of Z and Y conversions, as
these formats are not easily interpreted.
Input Ports Menu
This menu allows you to define the input ports for power ratio measurements, or a single input for
magnitude only measurements of absolute power. You cannot use single inputs for phase or group delay
measurements, or any measurements with averaging activated.
Analyzer Display Formats
The Format, key accesses the format menu. This menu allows you to select the appropriate display format
for the measured data. The analyzer automatically changes the units of measurement to correspond with
the displayed format. Special marker menus are available for the polar and Smith formats, each providing
several different marker types for readout of values. The selected display format of a particular
S-parameter or input is assigned to that parameter. Thus if different S-parameters are measured, even if
only one channel is used, each parameter is shown in its selected format each time it is displayed. The
following illustrations show a reflection measurement of a bandpass filter displayed in each of the available
formats.
Log Magnitude Format
The LOG MAG, softkey displays the log magnitude format. This is the standard Cartesian format used to
display magnitude-only measurements of insertion loss, return loss, or absolute power in dB versus
frequency. The bandpass filter reflection data in a log magnitude format is illustrated in Figure 5-5.