Configuring the RF Signal
R&S
®
SMW200A
563User Manual 1175.6632.02 ─ 30
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User correction (UCOR)
The user correction function allows you to compensate frequency responses of
external setups (e.g. losses of cables) and achieve a stable input signal over fre-
quency directly at the DUT.
See Chapter 8.9.3, "User Correction", on page 570.
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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.
See:
– Chapter 8.9.4, "Using Power Sensors", on page 581
– Chapter 8.9.5, "How to Calibrate the Power Level with an R&S NRP Power
Sensor", on page 593
– Chapter 8.9.4.2, "NRP Sensor Mapping", on page 583
– Chapter 8.9.4.3, "NRP Power Viewer", on page 586
8.9.1 Attenuator
About the attenuator
The step attenuator is either an electronic or mechanical device. Instruments with fre-
quency options up to 13 GHz use an electronic step attenuator, providing fast and wear
free level settings. Instruments capable to generate higher frequency signals use
mechanical step attenuators.
According to the requirements of your application, you can select different attenuator
characteristics.
The following are examples of test requirements and the corresponding configuration:
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Automatic configuration
Select standard operation mode ("Auto"), in which the generator adjusts the attenu-
ation of the RF output signal automatically.
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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.
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Uninterrupted level settings with constant VSWR
A fix attenuation value is required for obtaining uninterrupted level settings with
constant VSWR.
The configuration "RF Off Mode > Unchanged" ensures that constant VSWR is
maintained if you turn the signal off and on again.
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Highest level accuracy
Enter the target level value in "Fixed" mode and activate ALC (automatic level con-
trol).
Improving Level Performance
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