Configuring the Signal in the RF Domain
R&S
®
SMW200A
521User Manual 1175.6632.02 ─ 16
See Chapter 7.8.2, "ALC - Automatic Level Control", on page 524.
●
UCOR
The user correction function allows you to compensate external losses (e.g. of
cables) to achieve an input level of highest accuracy at the DUT.
See Chapter 7.8.3, "User Correction", on page 529.
●
Power sensors
The R&S NRP power sensors support RF signal level optimization by determining
the attenuation characteristics of downstream devices or cables, or by monitoring
the RF signal level at the output directly. The R&S SMW uses the readings of a
sensor for compensation of losses and thus improving the accuracy of the RF sig-
nal level
You can configure the measurement parameters of a power sensor directly in the
R&S SMW and monitor its readings, including calibration and firmware update.
See:
– Chapter 7.8.4, "Using Power Sensors", on page 540
– Chapter 7.8.5, "How to Calibrate the Power Level with an R&S NRP Power
Sensor", on page 553
– Chapter 7.8.4.2, "NRP Sensor Mapping", on page 541
– Chapter 7.8.4.3, "NRP Power Viewer", on page 543
– Chapter 7.8.4.4, "NRP Info Update", on page 551
7.8.1 Attenuator
The R&S SMW is equipped with an electronic step attenuator unit that supports RF
wear-free level setting.
About the attenuator
The attenuator is an electronic component which enables you to vary the amplitude of
the RF signal. Basically, it is characterized by low VSWR (voltage standing wave ratio)
up to 20 GHz over the full level range.
According to the requirements of your application, you can select different attenuator
characteristics.
The following are examples of test requirements and the corresponding configuration:
●
Automatic configuration
Select standard operation mode ("Auto"), in which the generator adjusts the attenu-
ation of the RF output signal automatically
●
Compensation for cable loss
You can compensate the loss of a cable connection by a higher output power
●
DUT tests under low signal to noise conditions
Low output power is suitable to test the behavior of a DUT under low signal to
noise conditions.
●
Uninterrupted level settings with constant VSWR
A fix attenuation value is required for obtaining uninterrupted level settings with
constant VSWR.
Improving Level Performance
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