Spectrum Measurements
R&S
®
ESR
428
User Manual 1175.7068.02 ─ 12
The R&S
ESR noise figure can be calculated from the measured power density level. It
is calculated by deducting the set RF attenuation (RF Att) from the displayed noise
level and adding 174 to the result.
Measurement example for Phase Noise Auto Peak Search
The phase noise of a CW signal at 100 MHz with 0 dBm level is to be measured at 800
kHz from the carrier.
1. [PRESET]
The R&S FSP is set to the default setting.
2. [FREQ] > "CENTER":
100 MHz
The center frequency is set to 100 MHz.
3. [SPAN]:
2 MHz
The span is set to 2 MHz.
4. [AMPT]:
0 dBm
The reference level is set to 0 dBm.
5. [MKR FCTN] > "MARKER 1"
Marker 1 is switched on and positioned at the maximum of the displayed trace.
6. "PHASE NOISE":
800 kHz
The phase noise measurement is switched on. The delta marker is positioned on
the main marker and the measured phase noise value is displayed in the marker
info field. The sample detector is used and the video bandwidth is set to 3 × RBW.
When the phase noise measurement function is enabled, the entry of the delta
marker frequency is activated. It can be entered directly.
Performing Band Power Measurements
Band power markers allow you to measure the integrated power (similar to ACP mea-
surements) for a defined span (band) around a marker. By default, 5 % of the current
span is used. The span is indicated by colored lines in the diagram. The result can be
displayed either as a power (dBm) or density (dBm/Hz).
Band power markers are only available for standard frequency measurements in Spec-
trum mode (not zero span, I/Q Analyzer etc.).
Analysis
