skrf.calibration.calibration.TwelveTerm

class skrf.calibration.calibration.TwelveTerm(measured, ideals, n_thrus=None, trans_thres=-40, *args, **kwargs)[source]

12-term, full two-port calibration.

TwelveTerm is the traditional, fully determined, two-port calibration originally developed in [1].

TwelveTerm can accept any number of reflect and transmissive standards, as well as arbitrary (non-flush) transmissive standards.

  • If more than 3 reflect standards are provided, a least-squares
    solution is implemented for the one-port stage of the calibration.
  • If more than 1 transmissive standard is given the load match,
    and transmission tracking terms are calculated multiple times and averaged.

References

[1]“Calibration Process of Automatic Network Analyzer Systems” by Stig Rehnmark

Attributes

biased_error Estimate of biased error for overdetermined calibration with multiple connections of each standard
caled_ntwk_sets Returns a NetworkSet for each caled_ntwk, grouped by their names
caled_ntwks List of the corrected calibration standards
coefs Dictionary or error coefficients in form of numpy arrays
coefs_12term Dictionary of error coefficients for 12-term Model
coefs_12term_ntwks Dictionary or error coefficients in form of Network objects
coefs_3term Dictionary of error coefficients for One-port Error model
coefs_3term_ntwks Dictionary of error coefficients in form of Network objects
coefs_8term Dictionary of error coefficients for 8-term (Error-box) Model
coefs_8term_ntwks Dictionary of error coefficients in form of Network objects
coefs_ntwks Dictionary of error coefficients in form of Network objects
error_ntwk The calculated error Network or Network[s]
family
frequency Frequency object of the calibration.
normalized_directivity the directivity normalized to the reflection tracking
nstandards number of ideal/measurement pairs in calibration
output_from_run Returns any output from the run().
residual_ntwk_sets Returns a NetworkSet for each residual_ntwk, grouped by their names
residual_ntwks Dictionary of residual Networks
total_error Estimate of total error for overdetermined calibration with multiple connections of each standard.
unbiased_error Estimate of unbiased error for overdetermined calibration with multiple connections of each standard
verify_12term
verify_12term_ntwk

Methods

__init__ TwelveTerm initializer
apply_cal
apply_cal_to_all_in_dir
apply_cal_to_list Apply correction to list of dict of Networks.
embed Embed an ideal response in the estimated error network[s]
from_coefs Creates a calibration from its error coefficients
from_coefs_ntwks Creates a calibration from its error coefficients
plot_caled_ntwks Plots corrected calibration standards
plot_errors Plots biased, unbiased and total error in dB scaled
plot_residuals Plot residual networks.
pop Remove and return tuple of (ideal, measured) at index.
remove_and_cal Remove a cal standard and correct it, returning correct and ideal
run
update_coefs update currect dict of error coefficients
write Write the Calibration to disk using write().