R&S ZVB - Page 360

R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 345
Use 2nd Harmonic Port1 to Port2 and 3rd Harmonic Port1 to Port2 to activate the measurement of the
second and third harmonics with a single menu command.
Remote control:
[SENSe<Ch>:]FREQuency:CONVersion:HARMonic:ORDer <order>
[SENSe<Ch>:]FREQuency:CONVersion:HARMonic:RPORt <port_no>
[SENSe<Ch>:]FREQuency:CONVersion:HARMonic:SPORt <port_no>
Reset Frequency Conversion
Activates the measurement of the fundamental with the current port assignments and trace settings. This
disables the harmonics measurement and all other frequency-converting measurements (e.g. scalar mixer
measurements) for the active channel.
Remote control:
[SENSe<Ch>:]FREQuency:CONVersion FUNDamental
Relative Measurement
Calculates the ratio of the selected harmonic to the fundamental (harmonic distortion factor) and displays
the result as a new trace. To avoid confusion between the original harmonic and the relative
measurement, the harmonic is hidden (invisible) but can be retrieved using the Trace Manager.
The relative trace belongs to a new channel. In the dB Mag trace format, the trace points are dB values,
after conversion to the lin Mag format, they correspond to the (dimensionless) ratio of two voltages:
Calculation of the Relative Trace
To obtain the relative trace the analyzer must measure the fundamental signal in addition to the active
harmonic. In a frequency sweep the two measurements require different sweep ranges so that the
fundamental is measured in a new channel. The relative trace is then calculated using trace mathematics.
Assume that the active 2nd harmonic belongs to channel Ch1 with a sweep range between 10 MHz and 2
GHz. The relative measurement involves the following steps:
1. The analyzer creates a new channel Ch2 with maximum sweep range, e.g. for a 24 GHz analyzer:
2. The harmonic trace is measured with Ch1 settings, the fundamental trace is measured with Ch2
settings.
3. The analyzer enables the trace mathematics and divides the harmonic trace by the fundamental trace: