Measurements
R&S
®
FSW
185User Manual 1173.9411.02 ─ 19
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The carrier is outside the analyzed channel: In this case, it is sufficient to switch on
the desired measurement function and to set the channel bandwidth. The carrier/
noise ratio is displayed on the screen.
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The carrier is inside the analyzed channel: In this case, the measurement must be
performed in two steps:
– First, perform the reference measurement by switching on either the C/N or the
C/NO measurement and waiting for the end of the next measurement run. The
fixed reference marker is set to the maximum of the measured carrier signal.
– Then, switch off the carrier so that only the noise of the test setup is active in
the channel. The carrier-to-noise ratio is displayed after the subsequent mea-
surement has been completed.
Frequency Span
The frequency span should be set to approximately 4 times the channel bandwidth in
order to measure the carrier-to-noise ratio correctly. This setting is defined automati-
cally by the "Adjust Settings" function.
5.4.2 Carrier-to-Noise Results
As a result of the carrier-to-noise measurement the evaluated bandwidth and the cal-
culated C/N ratio are displayed in the result window. The fixed reference marker is indi-
cated in the diagram.
Remote command:
You can also query the determined carrier-to-noise ratio via the remote command
CALC:MARK:FUNC:POW:RES? CN or CALC:MARK:FUNC:POW:RES? CN0, see
CALCulate:MARKer:FUNCtion:POWer<sb>:RESult? on page 696.
Carrier-to-Noise Measurements
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