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Demonstrating multiport configuration
The Keysight PXI VNA is an ideal solution for multiport measurements. The PXI VNA has a two-port (2- reference receivers
and 2- test receivers) architecture in a one-slot module. It can be easily configured as a true multiport VNA by using
additional modules installed in the same chassis. The true multiport VNA has no degradation in performance (i.e. dynamic
range, trace noise, directivity,) due to external switches. The PXI VNA supports full n-port correction capability when
configured as a multiport VNA.
The mainframe should have the latest version of the software for this demonstration. Refer to verify and install
the software section for more detail.
In the following instructions, eight modules are configured. Use these instructions as a general guide if
installing a different number of modules.
The selected modules in a Multiport VNA MUST be sequential. For example, to configure a 6-port VNA using
the above installed modules, you could choose Slots 5, 6, 7
Install modules
1. As seen in below figure, each module is shipped with two 50 ohm loads attached to each module. To enable
a. On the module in slot 1, remove the 50 ohm load from the LO Out port. Leave the load installed on the LO
In port.
b. On the module in slot 8, remove the 50 ohm load from the LO In port. Leave the load installed on the
LO Out port.
c.
On each of the remaining modules, remove both 50 ohm loads.
d. Save the 50 ohm loads that were just removed for possible reuse in another module configuration.
connections between module pairs, some of these loads must be removed.
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