R&S ZVB - Page 556

R&S
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ZVA / R&S
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ZVB / R&S
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ZVT GUI Reference
System Menu
Operating Manual 1145.1084.12 – 30 541
via USB, named by serial numbers, to the available test ports.
Once retrieved from the R&S ZCxxx, the operational data are kept in the NWA for further use, so the
converter can be selected at a later time without the need to reconnect it via USB.
R&S ZCxxx converters are provided with internal supervision of vital operating conditions, like
temperature, fan function and availability of the supply voltages. If one of these conditions exceeds its
allowed tolerance range, a tool tip message appears on the NWA screen. This message will be shown as
long as the respective parameter remains ill-conditioned. In case that the operating condition exceeds the
safe range by far, the converter will automatically switch off its power supply.
Analyzer settings with active frequency converter
After a particular converter type and test setup is applied, the analyzer is automatically configured as
follows:
 A preset is applied. The preset behavior will be reset to Preset Scope: Instrument and Preset
Configuration: Factory Preset.
 The default frequency range of the selected converter type is set (e.g. 75 GHz to 110 GHz for
R&S ZVA-Z110 converters). If no converter is selected, (Type = <NONE>), the default frequency
of the network analyzer is set. The Source section of the Port Configuration table shows the true
output frequencies at all analyzer ports and the frequency conversion formulas.
 The output powers at the RF and LO ports are set to optimum values. For converters without
electronic attenuator, the output power of the converters can be reduced using the knurled
adjusting knob on top of the converter.
 The LO signals are permanently on; the RF source signal is present only during the partial
measurements that require the respective test port as a drive port.
 Low Phase Noise is enabled.
 ALC (All Chans) is disabled.
 For frequency converters without electronic attenuators, Flatness Cal is disabled in the Modify
Source Power Cal dialog (see Calibration for Converters without Electronic Attenuators). For
converters with electronic attenuators, Flatness Cal remains enabled.
All signal settings appear in the Port Configuration dialog as soon as the frequency converter mode is
active. In the example below, a sweep range between 75 GHz and 110 GHz is selected. The frequency
multipliers for the RF signals have a multiplication factor of 6, so the actual output frequency at the RF
ports 1 and 2 is between 12.5 GHz and 18.3333333 GHz. The frequency of the LO signal is such that the
reference and measurement channels are received at the fixed IF frequency of 279 MHz (shown in the
Receiver section of the Port Configuration dialog). The LO frequency is always below the RF frequency
(upper sideband).
It is also possible to define port-specific frequencies and powers at the converter ports; see Power
and Frequency Settings.