R&S FSPN - Spot Noise

Measurements and Result Displays
R&S
®
FSPN
91User Manual 1179.4363.02 ─ 01
Power** Shows the power level of the spur in dBc.
Jitter** Shows the jitter value of the spur in s.
In addition to the jitter for each spur, the result dis-
play also shows the discrete jitter and the random jit-
ter at the end of the table.
●
The discrete jitter is the RMS average of all
individual spur jitter values.
●
The random jitter is the jitter contribution of the
phase noise without spurs.
* For baseband noise measurements, the result is the absolute frequency that the spur is located at.
** For baseband noise measurements, the unit is variable.
*** For baseband noise measurements, the jitter is always 0.
Remote command:
FETCh<n>:PNOise<t>:SPURs? on page 328
FETCh<n>:PNOise<t>:SPURs:COUNt? on page 328
FETCh<n>:PNOise<t>:SPURs:JITTer? on page 329
FETCh<n>:PNOise<t>:SPURs:DISCrete? on page 329
FETCh<n>:PNOise<t>:SPURs:RANDom? on page 329
Spot Noise
The "Spot Noise" result display shows the noise at a certain frequency offset (or spot)
that is part of the measurement range. It is thus like a fixed marker.
The unit of spot noise results is dBc/Hz (variable unit for baseband noise measure-
ments). The application shows the results in a table.
The table consists of a variable number of 10
x
frequencies (depending on the mea-
surement range), and a maximum of six user frequencies, with each row containing the
spot noise information for a particular frequency offset.
The spot noise information is made up out of several values.
Offset Frequency* Shows the offset frequency the spot noise is evalu-
ated for. You can add any offset that is part of the
measurement range.
The number in brackets (T<x>) indicates the trace
the result refers to.
Noise[T<x>] Shows the noise for the corresponding offset fre-
quency.
The number in brackets (T<x>) indicates the trace
the result refers to.
* For baseband noise measurements, the result is the absolute frequency of the spot.
Remote command:
Querying spot noise results on 10
x
offset frequencies:
CALCulate<n>:SNOise<s>[:TRACe<t>]:DECades:X? on page 372
CALCulate<n>:SNOise<s>[:TRACe<t>]:DECades:Y? on page 373
Querying custom spot noise results:
CALCulate<n>:SNOise<s>[:TRACe<t>]:Y? on page 374
Result Displays