Activates or deactivates the system error correction of all a- and b-waves which are related to the ports of the active channel calibration. The enhanced wave correction provides system error corrected complex wave quantities and ratios for a group of analyzer ports.
If no channel calibration is available the enhanced wave correction is still applied, based on the factory calibration. The calibration labels in the trace lines of the wave quantities and ratios allow you to distinguish the enhanced wave correction states:
Enhanced wave correction off: no Cal label, Pcal label according to the power calibration state.
Enhanced wave correction on, factory calibration: no Cal label, no Pcal label, irrespective of the power calibration state.
Enhanced wave correction on, channel calibration: Cal label, Pcal label according to the power calibration state. A single power calibration at one port ensures power calibrated waves (Pcal) at all ports.
For consistent measurements, it is recommended to use the enhanced wave correction in combination with a (sufficient) set of system error corrections and power calibrations; see Enhanced Wave Correction Procedure and Limitations.
In the present firmware version, the enhanced wave correction for all ports is referenced to the factory calibration when a wave quantity or ratio for an uncalibrated port is selected. The Cal labels are removed in all trace lines for ratios and wave quantities, including the traces lines for calibrated ports. The same happens if an uncalibrated port is activated for the measurement using the Meas check box in the Port Configuration dialog. It is recommended to provide the calibrations for all ports before activating the enhanced wave correction, creating traces, and activating ports.
The enhanced wave correction is automatically activated when one of the following measurement modes is selected:
True differential mode or defined coherence mode (with option R&S ZVA-K6). Enhanced wave correction is a prerequisite for these modes and cannot be disabled.
Enhanced scalar mixer measurement. This is a scalar mixer measurement in combination with an enhanced wave correction. Activating the enhanced wave correction activates enhanced scalar mixer mode and vice versa.
Remote control:
[SENSe<Ch>:]CORRection:EWAVe[:STATe]
The enhanced wave correction for a group of analyzer ports is based on a system error correction which provides the correct power ratios and phase relationships between the waves. For a single port, a full one-port calibration is required. For n ports, a full n-port calibration (TOSM, TRL, TNA ...) is required.
A power calibration is not mandatory but required for absolute power measurements. To obtain the absolute powers at all ports within the port group, either a source power calibration with reference receiver calibration or a receiver calibration at a single port is sufficient. For best accuracy, perform a source power calibration with active reference receiver calibration.
With active enhanced wave correction and power calibration, the analyzer shows the true waves and ratios at the calibrated reference plane. For a one-port measurement at port n, the corrected ratio bn/an is equal to the system error-corrected reflection coefficient Snn. For n-port measurements, due to the definition of the S-matrix, ratios and S-parameters are generally different.
Some frequency-converting measurement modes combine different port groups with different frequencies. The port groups are defined as follows:
No frequency conversion: The ports which are selected for the measurement (Meas check box on in the Port Configuration dialog) form a port group for enhanced wave correction. After a full n-port calibration, the n calibrated ports are selected.
Scalar Mixer Measurement: Port 1 corresponds to port group 1, port 2 corresponds to port group 2, see detailed example below.
Defined Coherence Mode: All driving (coherent) ports form port group 1, the remaining ports (with Meas on) form port group 2.
Example: In a scalar mixer measurement, port 1 drives at the RF output frequency fRF, port 2 measures at the different IF frequency fIF. For a 300 kHz LO frequency and an RF frequency range of 1 GHz ... 2 GHz, the Port Configuration dialog shows the following settings.
An Enhanced Scalar Mixer Measurement is a combination of the scalar mixer measurement with enhanced wave correction at port 1 and port 2. This requires two full one port calibrations (predefined as a Scalar Mixer Meas Cal). Alternatively, you can perform a full two-port calibration for ports 1 and 2. The analyzer will perform "segmented" calibration sweeps over all required frequency ranges and extract the calibration data for the individual port groups from the full set of calibration data. The Channel Manager displays the properties of the two-port system error correction as follows (2 frequency segments, each with 201 points):
The two alternative calibration schemes are depicted below.
The Scalar Mixer Meas Power Cal provides the necessary power calibrations for consistent absolute powers at Port 1 and Port 2.
No frequency conversion: All measured ports belong to the same port group.
Scalar Mixer Measurement, arbitrary mode: Two port groups, must correspond to the logical ports no. 1 and 2.
Defined Coherence Mode: The combined ports which provide the coherent signals (port group 1) must be at the same frequency. The remaining analyzer ports (port group 2) may measure at a different frequency.