skrf.calibration.calibration.TwelveTerm¶

class
skrf.calibration.calibration.
TwelveTerm
(measured, ideals, n_thrus=None, trans_thres=40, *args, **kwargs)[source]¶ 12term, full twoport calibration.
TwelveTerm is the traditional, fully determined, twoport calibration originally developed in [1].
TwelveTerm can accept any number of reflect and transmissive standards, as well as arbitrary (nonflush) transmissive standards.
 If more than 3 reflect standards are provided, a leastsquares
 solution is implemented for the oneport 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 12term Model 
coefs_12term_ntwks 
Dictionary or error coefficients in form of Network objects 
coefs_3term 
Dictionary of error coefficients for Oneport Error model 
coefs_3term_ntwks 
Dictionary of error coefficients in form of Network objects 
coefs_8term 
Dictionary of error coefficients for 8term (Errorbox) 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.This is the combined effects of both biased and unbiased errors 
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() 