Common Measurement Settings
R&S
®
FSPN
112User Manual 1179.4363.02 ─ 01
Sweep/Average Count ................................................................................................115
Selecting the sweep direction......................................................................................115
Working with the half decade configuration table........................................................115
Estimating the measurement time
Based on the parameters you have defined for the noise measurement, the application
estimates the total measurement time required to measure the noise characteristics
over all half decades. It is displayed in the channel bar ("Meas Time" label).
The remaining measurement time of the current measurement is indicated in the pro-
gress bar in the status bar (for measurements that last longer than 1 second).
Display of the remaining measurement time is supported by the following measure-
ments:
●
Phase noise
●
Baseband noise
The measurement time is function of the resolution bandwidth, cross-correlation factor
and the number of averages defined for the measurement.
For resolution bandwidths below 0.1%, the estimated measurement time is not availa-
ble.
Remote command:
[SENSe:]SWEep:TIME on page 365
Defining the resolution bandwidth
The resolution bandwidth (RBW) is the filter bandwidth applied during the noise mea-
surement. Noise measurements apply a different resolution bandwidth to each half
decade that is measured: small bandwidths for small frequency offsets and higher
bandwidths for larger frequency offsets (to speed up the measurement on larger fre-
quency offsets).
You can define a custom resolution bandwidth for each half decade, or let the applica-
tion selects an appropriate resolution bandwidth, depending on the "Half Decade Con-
fig" mode.
For an automatic selection, the resolution bandwidth that is applied to each half dec-
ade is a function of the frequency offset. By default, the resolution bandwidth is 10 % of
the start offset of the half decade. If the start offset is, for example 10 kHz, the resulting
resolution bandwidth is 1 kHz.
If necessary, you can change the resolution bandwidth factor. A selected set of percen-
tages in the range from 0.1 % to 30 % is supported.
Remote command:
Configuration mode: [SENSe:]SWEep:MODE on page 365
RBW factor: [SENSe:]LIST:BWIDth[:RESolution]:RATio on page 361
RBW: [SENSe:]LIST:RANGe<r>:BWIDth[:RESolution] on page 362
Ultra-Small RBWs
Provides functionality to enable ultra-small resolution bandwidths (RBW) for the current
measurement.
Noise Measurement Configuration
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