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Allow changing Z0 in through standard

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This commit is contained in:
Jan Käberich 2024-01-20 21:19:25 +01:00
parent ee16dbc070
commit ec4828d4c4
6 changed files with 92 additions and 2 deletions
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2
Software/PC_Application/LibreVNA-GUI/Calibration/CalStandardThroughEditDialog.ui
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@ -72,7 +72,7 @@
<item row="0" column="1">
<widget class="SIUnitEdit" name="Z0">
<property name="enabled">
<bool>false</bool>
<bool>true</bool>
</property>
</widget>
</item>

8
Software/PC_Application/LibreVNA-GUI/Calibration/calstandard.cpp
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@ -579,7 +579,13 @@ Sparam Through::toSparam(double freq)
double through_att = pow(10.0, -through_att_db / 10.0);
auto through = polar<double>(through_att, through_phaseshift);
// Assume symmetric and perfectly matched through for other parameters
return Sparam(0.0, through, through, 0.0);
auto S = Sparam(0.0, through, through, 0.0);
// update S parameters if Z0 does not match system impedance exactly
if(Z0 != 50.0) {
auto abcd = ABCDparam(S, Z0);
S = Sparam(abcd, 50.0);
}
return S;
}
}