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VNA Calibration - 12 Error Term model

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darcyrandall2004

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Hello, I have an Advantest R3762 VNA which has an annoying feature of requiring the calibration data to be reloaded from a floppy each time the thing is started. I have decided that I wish to use an excel macro to calibrate the machine and store the results in an SQL database. I am currently in the process of writing the VBA logic but the attached extract from "Microwave Component Measurements" troubles me.

http://obrazki.elektroda.pl/8183532000_1355153284.jpg

Page 132, states that all VNAs have in built models for the reflection standards, Short, Open, Load. Basically I measure the standards, then the VNA compares the measured values with its inbuilt models to determine what sort of correction is required.


I will require these models if I am to write the calibration logic. Does anyone know where I can find the models?

What if I measure the standards attached directly to the VNA ports and take these values as the Actual reflection standards. Then I attach the cables and VNA reflection standards and determine the Measured reflections. From these measurements I can then determine the calibration error terms. What do you think? Would this be accurate?

Any better ideas?



Thank you
 

johnjoe

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Maybe look for "Applying Error Correction to NWA Measurements" from Agilent. Maybe it will help!
 

radiohead

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This application note will definitely help you:
"Specifying Calibration Standards and Kits for Agilent Vector Network Analyzers"

I assume you have the formulas for performing the 12 error-term calculations?
 

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