System Overview
R&S
®
CMW500
61
User Manual 1173.9463.02 ─ 02
4.3.2 Connection Control (Measurements)
The R&S CMW500 provides a number of settings that are very similar in different meas-
urements but can be configured independently. These settings control the routing of input
signals, the correction of the input power, the RF analyzer and trigger system.
Signal Routing Settings (Input)
The R&S CMW500 provides RF input connectors for different power ranges, see
The RF input connector and the RX module are selected in the "RF Routing" section at
the beginning of the measurement configuration dialogs.
External Attenuation (Input)
Defines the value of an external attenuation (or gain, if the value is negative) in the input
path. This is suitable if the test setup contains a frequency-independent attenuating com-
ponent (e.g. a non-ideal cable, a test fixture or an RF shielding chamber used to hold the
DUT), or an amplifier.
Additional settings for compensation of a frequency-dependent attenuation/gain are pro-
vided by the base system of the instrument. They allow to define correction tables con-
taining pairs of frequencies and associated attenuation/gain values.
If a table is activated for an input connector, the correction value associated with the
current carrier frequency and the frequency-independent "External Attenuation" defined
in the measurement settings are added. Correction values for intermediate frequencies
between two frequency entries are calculated using linear interpolation. For frequencies
higher than the highest frequency entry in the table, or lower than the lowest frequency
entry, the correction value associated with the highest / lowest frequency entry is used.
The total correction value (frequency-independent "External Attenuation" + frequency-
dependent correction) modifies the power reading of the measurement and ensures that
the measured powers are referenced to the output of the DUT.
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Positive values increase the power reading, compensating for an attenuation.
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Negative values reduce the power reading, compensating for an amplification factor
(gain).
Measurements
