R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 385
CALCulate<Ch>:TRANsform:VNETworks:BALanced...
MMEMory:LOAD:VNETworks<Ch>:BALanced:DEEMbedding<Log_pt>
'<file_name>', PMAIn, PSECondary
MMEMory:LOAD:VNETworks<Ch>:BALanced:EMBedding<Log_pt>
'<file_name>', PMAIn, PSECondary
Ground Loop (De-)Embedding
Selects a ground loop transformation network for (de-)embedding, defines its parameters, and enables
(de-)embedding. Ground loop (de-)embedding is not assigned to a physical or logical analyzer port. The
two dialogs for deembedding and embedding are identical except for their inverse effect.
Ground loops
A ground loop models the effect of a non-ideal ground connection of the DUT causing a difference in
potential between the analyzer's and the DUT's ground reference. A typical and often unavoidable source
of ground loops is the parasitic inductance of the ground contacts.
In contrast to the 2-port (de-)embedding networks, the ground loop represents a single-wire connection:
The ground loop can be described by a one-port S-matrix. On the other hand, the ground loop (de-
)embedding algorithm for an n-port DUT involves matrix operations which are based on the complete
uncorrected nxn S-matrix. The number of (measured) ports of the DUT must be entered in the Port
Configuration dialog; this ensures that the analyzer acquires the complete set of S-parameters.
The following port configuration corresponds to a DUT with one balanced and two single-ended ports. As
a prerequisite for ground loop (de-)embedding the analyzer must determine a 4x4 S-matrix.
In general, an n-port analyzer is capable of measuring n 1-port DUTs in parallel. A four-port analyzer can
also perform two simultaneous 2-port measurements, if appropriate port groups are defined. Ground loop
(de-)embedding is compatible with simultaneous measurements on different DUTs; it does not affect the
number of measurements which can be performed in parallel. Note however that all port groups are
assigned the same ground loop transformation network.
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