R&S
®
ZVA / R&S
®
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ZVT GUI Reference
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Operating Manual 1145.1084.12 – 30 480
correction is not available for Simultaneous Measurement with Frequency Offset.
Load Match Correction
Activates or deactivates the load match correction for frequency conversion measurements. The softkey is
disabled if no frequency conversion mode is active. The load match correction prevents a possible
impairment of the transmission S-parameter measurements due to the influence of the waves reflected at
the receive (load) ports.
In the present firmware version, the load match correction is suited for scalar mixer measurements
only.
In a scalar mixer measurement, port 1 is used as a source port, port 2 is the load port. The load match
correction compensates for the effect of a mismatched load port 2, on the conversion gain S
21
.
The load match correction is performed as follows:
The correction is based on the system error corrected a- and b-waves of the source and load
ports. This means that an Enhanced Wave Correction must be performed prior to the load match
correction.
A reverse sweep with port 2 as drive port is automatically performed during the measurement.
The correction is calculated under the assumption that the reverse transmission factor (S
12
in the
example above) is zero.
The load match correction can provide a significant improvement of the transmission S-parameter
measurements if the load ports are poorly matched. With sufficiently matched load ports, you can disable
the correction to gain speed.
The load match correction is automatically activated when a scalar mixer measurement with source and
load match correction (see Define Scalar Mixer Meas) is selected. Conversely, activating the load match
correction activates source and load match correction for the scalar mixer mode.
The full two-port calibration types (TOSM, UOSM, TNA, TRL...) and the full n-port calibration for three
and more ports provide the load match correction terms: No additional load match correction is required
for measurements without frequency conversion.
[SENSe<Ch>:]FREQuency:CONVersion:GAIN:LMCorrection
Cal and Corr at Base Frequency
Forces power calibrations and system error corrections to be performed at the channel base frequency f
b
,
irrespective of the port frequencies. This setting is suitable for test setups with external frequency
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