R&S ESR Series User Manual

Spectrum Measurements
R&S
®
ESR
250User Manual 1175.7068.02 ─ 12
For this measurement, the RMS detector is activated.
The carrier-to-noise measurements are only available in the frequency domain (span
>0).
There are two methods to measure the carrier-to-noise ratio:
●
The carrier is outside the examined 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.
●
The carrier is inside the examined 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.
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.
To determine the carrier-to-noise ratio
1. Press the "C/N, C/NO" softkey to configure the carrier-to-noise ratio measurement.
2. To change the channel bandwidth to be examined, press the "Channel Bandwidth"
softkey.
3. To optimize the settings for the selected channel configuration, press the "Adjust
Settings" softkey.
4. To activate the measurements without reference to the bandwidth, press the "C/N"
softkey.
To activate the measurements with reference to the bandwidth, press the "C/NO"
softkey .
5. If the carrier signal is located within the examined channel bandwidth, switch off the
carrier signal so that only the noise is displayed in the channel and perform a sec-
ond measurement.
The carrier-to-noise ratio is displayed after the measurement has been completed.
Measurement results
As a result of the carrier-to-noise measurement the evaluated bandwidth and the cal-
culated C/N ratio are indicated beneath the diagram.
Measurements

R&S ESR Series Specifications

General

Brand	R&S
Model	ESR Series
Category	Receiver
Language	English