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81 SNA5000A Vector Network Analyzer User Manual
S parameters are used. Selecting the adjustment mismatch item can increase the loss of the
fixture so that the peak value of the ripple is below 0 dB. Although this will increase the error,
it can prevent the numerical instability of S parameters from appearing when it is used.
7. Click Next to enter the measurement interface. Before the measurement, make sure that
the device has been removed from the test fixture. In this way, the open-circuit
measurement can be performed. Of course, the test fixture can also refer to the plane Short
circuit to conduct the Short measurement. It can carry out one of the Open or Short
measurements or simultaneously carry out the Open and Short measurements. When two
measurements are used, the result will be the average of the two measurements, and the
accuracy will be improved.
Figure 3-30 Automatic port extension calibration interface
3.7 Fixture measurement function
In addition to the port extension function, the vector network analyzer also provides several
other functions for test fixtures:
1. Port match (2-port embedding)
2. Port impedance conversion
3. 2-port de-embedding
4. N port embed/de-embed (port 4/6/8)
5. Differential port match
6. Differential port impedance conversion
7. Common port impedance conversion
Port match operation steps:
1. Ensure that the user has completed the S parameter calibration and obtained the S
parameters of the DUT.
2. Select Cal→Fixtures→Fixture Setup→Port Match to enter the Settings screen.
3. By selecting the port and the parameter representation form of the matching module, the
S2P file (AKA Touchstone file) of the matching module can be directly exported or the
circuit model of the matching module can be used. It supports 9 topologies which are
combined by L, R, G, and C. It is necessary to manually set the parameter values of L, R,
G, and C components. Checking the Enable Port Matching On All Ports tab means that
all ports are matched. When the frequency range in the S2P file of the imported matching
module is less than the frequency range set by the current interface, such as the Enable
Extrapolation item is not checked, the system will extrapolate the S2P file by default. In
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