Applications
R&S
®
RTM3000
177User Manual 1335.9090.02 ─ 09
Center
Defines the frequency in the center of the displayed span. The instrument adjusts the
start and stop frequencies.
To set the center frequency, you can also use the horizontal [Position] knob if the focus
is on the spectrum window.
Remote command:
SPECtrum:FREQuency:CENTer on page 544
Span
The span is specified in Hertz and defines the width of the displayed frequency range,
which is (Center - Span/2) to (Center + Span/2). The instrument adjusts the start and
stop frequencies.
To set the frequency span, you can also use the horizontal [Scale] knob if the focus is
on the frequency window.
Remote command:
SPECtrum:FREQuency:SPAN on page 544
RBW
The resolution bandwidth (RBW) determines the resolution of the spectrum, that is: the
minimum distance between two distinguishable peaks. The higher the resolution (the
smaller the ratio), the more peaks are detected, but the longer the measurement
requires to finish.
If "Automatic RBW" is selected, the RBW value is adjusted automatically and the value
is shown for information. When you set the RBW manually, the instrument adjusts the
time gate.
Remote command:
SPECtrum:FREQuency:BANDwidth[:RESolution][:VALue] on page 545
SPECtrum:FREQuency:BANDwidth[:RESolution]:RATio on page 545
W
Width of the time gate for which FFT is calculated. The value can be changed if "Auto-
matic RBW" is disabled, and the RBW value is adjusted automatically.
Remote command:
SPECtrum:TIME:RANGe on page 546
P
Shows the position of time gate for which FFT analysis is performed. The position is an
offset of the time gate center to the 0 s reference point. The value can be changed if
"Automatic RBW" is disabled, and the RBW value is adjusted automatically.
Remote command:
SPECtrum:TIME:POSition on page 545
9.2.3.3 FFT menu
► Press the [ FFT] key.
FFT analysis
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