Spectrum Measurements
R&S
®
ESR
359
User Manual 1175.7068.02 ─ 12
In frequency sweep mode, the analyzer provides several possible methods of sweep-
ing:
●
●
on page 359 (not available with 5-Pole filters, channel filters or RRC filters,
see
Chapter 6.2.6.3, "Selecting the Appropriate Filter Type"
●
Sweep ← Sweep Type
to standard analog frequency sweep.
In the standard sweep mode, the local oscillator is set to provide the spectrum quasi
analog from the start to the stop frequency.
Remote command:
SWE:TYPE SWE
, see
FFT ← Sweep Type
The FFT sweep mode samples on a defined frequency value and transforms it to the
spectrum by fast Fourier transformation (FFT).
FFT is not available when using 5-Pole filters, Channel filters or RRC filters. In this
case, sweep mode is used.
Remote command:
SWE:TYPE FFT
, see
Auto ← Sweep Type
Automatically sets the fastest available
for the current measurement. Auto
mode is set by default.
Remote command:
SWE:TYPE AUTO
, see
FFT Filter Mode ← Sweep Type
Defines the filter mode to be used for FFT filters by defining the partial span size. The
partial span is the span which is covered by one FFT analysis.
Auto ← FFT Filter Mode ← Sweep Type
The firmware determines whether to use wide or narrow filters to obtain the best mea-
surement results.
Remote command:
[SENSe:]BANDwidth|BWIDth[:RESolution]:FFT
Narrow ← FFT Filter Mode ← Sweep Type
For an RBW
≤
10kHz, the FFT filters with the smaller partial span are used. This allows
you to perform measurements near a carrier with a reduced reference level due to a
narrower analog prefilter.
Remote command:
[SENSe:]BANDwidth|BWIDth[:RESolution]:FFT
Configuration
