NIST Microwave Uncertainty Framework (Beta version)The NIST Microwave Uncertainty Framework provides a "drag-and-drop" toolkit for managing the calculation of uncertainties in VNA and other measurements. The framework makes it easy to construct models for calibration standards and automates the calculation of uncertainties with both a conventional linear error-propagation analysis and a Monte-Carlo analysis capable of propagating uncertainties through nonlinear models. The framework includes a Vector-Network-Analyzer (VNA) Uncertainty Calculator for guiding the generation of uncertainties in scattering parameters. The framework also includes a post processor that allows the uncertainties in measured scattering parameters to be propagated to derived measurements, such as transistor gain, power, material parameters, and mismatch-corrected temporal signals. StatistiCAL VNA Calibration Software PackageThe StatistiCALTM VNA Calibration Software Package is our newest VNA calibration software package. It accommodates almost all coaxial and on-wafer standards, and enables a "mix and match" The software combines a decade of experience in statistics and orthogonal distance regression with an easy-to-use user interface. Research at NIST has extended the analysis of uncertainties caused by random errors to include systematic errors in the solution. The uncertainties in the solution are represented by a covariance matrix that relates errors in both the VNA calibration and measurements of the device under test. In addition, the algorithm determines coverage factors based on the different numbers of degrees of freedom associated with various parts of the solution. Read a paper describing the algorithms employed by this new software package. Read a paper comparing this algorithm to MultiCal. To receive a free copy of the software, download the installation file, read the user agreement, and request a password. Please include the statement "I have read and agree to the terms and conditions of the NIST Measurement Software user agreement" in your e-mail. MultiCal
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philosophy to VNA calibration. The software is based on an algorithm developed at the U.S. National Institute of Standards and Technology (NIST) and the Physikalisch-Technische Bundesanstalt (PTB) of Germany, which is able to estimate the uncertainty of its own results due to random errors. The algorithm features a high degree of robustness, allowing it to find solutions even with poor initial estimates.
The NIST LSNA Verfication Software uses a procedure similar to the calibration comparison method to help a user evaluate the differences between LSNA calibrations. The user performs two calibrations that may differ due to standards used, test set drift, or other reasons. The software program compares the two calibrations and helps the user asses the impact of the differences between them. 
Software to assist in correctly applying the numerical Fourier Transform. This software package helps in selecting the proper Forier transform formulas and normalization constants. Both single pulses and repeating signals are treated. The progam displays appropriate relationships on the front panel. See the related 
Use VeridiCal to automate VNA verifications with electronic calibration units. Not only does the software streamline the verification process, but it more completely verifies the calibration and allows you to see the impact of the calibration errors on your device under test directly. 