skrf.calibration.calibration.LMR16¶

class
skrf.calibration.calibration.
LMR16
(measured, ideals, ideal_is_reflect=True, sign=None, switch_terms=None, *args, **kwargs)[source]¶ SixteenTerm LoadMatchReflect selfcalibration.
16Term self calibration for leaky VNA. Implementation is based on [1].
 Needs five standards to be measured and given in this order:
 Through
 Matchmatch
 Reflectreflect
 Reflectmatch
 Matchreflect
Reflect standard needs to be very reflective and same in all measurements. Matching of through and match standards is assumed to be perfect. Loss of the through is assumed to be zero, but its length can be nonzero.
Only reflect or through standard needs to be known and the other one will be solved during the calibration. Solved Sparameters of the standards can be accessed with LMR16.solved_through and LMR16.solved_reflect.
Switch termination is already assumed to be done either by the previous calibration or during the measurements. Regular switch correction equations used with EightTerm calibration can’t be used if leakage is significant.
References
[1]  Silvonen, “LMR 16a selfcalibration procedure for a leaky network analyzer,” in IEEE Transactions on Microwave Theory and Techniques, vol. 45, no. 7, pp. 10411049, Jul 1997
Attributes
T_matrices 
Intermediate matrices used for embedding and deembedding. 
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 
measured_unterminated 

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 
solved_reflect 
Return the solved reflect or the ideal reflect if through was solved 
solved_through 
Return the solved through or the ideal through if reflect was solved 
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
E_matrices 
Convert solved calibration T matrices to Sparameters. 
__init__ 
LMR16 initializer 
apply_cal 
Apply correction to a Network 
apply_cal_to_all_in_dir 

apply_cal_to_list 
Apply correction to list of dict of Networks. 
embed 

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 
Runs the calibration algorithm. 
terminate 
Terminate a network with switch terms 
unterminate 
Unterminates switch terms from a raw measurement. 
update_coefs 
update currect dict of error coefficients 
write 
Write the Calibration to disk using write() 