Agilent Technologies N4413A, User Manual

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Using the Multiport Test System
How to De-Embed Measurement Data
Chapter 3 47
How to De-Embed Measurement Data
To use test fixtures or adapters with the multiport test system and establish different
calibration and measurement reference planes, the system allows the effect of the fixture or
adapter to be removed by de-embedding.
You select de-embedding options during setup of a measurement. The characterization file
contains the S-parameters in Citifile format, but with additional header information.
You must first characterize any adapters, fixtures, or probes to use the de-embedding
function. See
“How to Characterize Adapters” on page 44 for more information.
How to Make Measurements
The multiport test system measurements require the completion of four prerequisite steps:
• Setup of the software and hardware (see “How to Set Up the Multiport Test System
Hardware” on page 18 and “How to Install and Start the Balanced Measurement
Software” on page 39 .)
• Determination of your test requirements
• Characterization of any needed adapters (see “How to Characterize Adapters” on page 44 )
• System calibration (see “How to Calibrate” on page 40 )
On completion of these steps, simply connect the device under test (DUT) to the system and
click the
Measure button on the main screen.
Attenuation
Set the attenuator to allow sufficient measurement dynamic range while considering DUT
compression and avoiding over-driving the receiver in the network analyzer. Too much
attenuation limits calibration accuracy. Calibration accuracy can be improved at the expense
of measurement time with a narrower calibration IF bandwidth. This selection is only
available on the N4413A (ATN-4111A) and N4414A (ATN-4111B) systems.