Rohde & Schwarz R&S FSP Series, Operating Manual

Page: 82 / 796

R&S FSP Instrument Functions
Analyzer Mode
4.10 Operating Manual 1164.4556.12 - 06
CENTER The CENTER softkey opens the window for manually entering the center frequency.
The allowed range of values for the center frequency is:
• for the frequency domain (span >0):
minspan / 2
≤
f
center
≤
f
max
– minspan / 2
• and for the time domain (span = 0):
0 Hz
≤
f
center
≤
f
max
Remote command:
FREQ:CENT 100MHz
CF STEPSIZE
The CF STEPSIZE softkey opens a submenu for setting the step size of the center
frequency. The step size can be coupled to the span (frequency domain) or the res-
olution bandwidth (time domain) or it can be manually set to a fixed value. The soft-
keys are mutually exclusive selection keys.
The softkeys are presented according to the selected domain (frequency or time).
Softkeys in frequency domain:
0.1 * SPAN The 0.1 * SPAN softkey sets the step size for the center frequency entry to 10% of
the span.
Remote command:
FREQ:CENT:STEP:LINK SPAN
FREQ:CENT:STEP:LINK:FACT 10PCT
0.5 * SPAN The 0.5 * SPAN softkey sets the step size for the center frequency entry to 50% of
the span.
Remote command:
FREQ:CENT:STEP:LINK SPAN
FREQ:CENT:STEP:LINK:FACT 50PCT
X * SPAN The X * SPAN softkey allows the factor defining the center frequency step size to be
entered as % of the span.
Remote command:
FREQ:CENT:STEP:LINK SPAN
FREQ:CENT:STEP:LINK:FACT 20PCT
= CENTER The = CENTER softkey sets the step size coupling to MANUAL and the step size to
the value of the center frequency. This function is especially useful during measure-
ments of the signal harmonic content because by entering the center frequency
each stroke of the
STEP key selects the center frequency of another harmonic.
Remote command:
--
EXTERNAL MIXER
(option B21)
f
center
center frequency
minspan smallest selectable span > 0 Hz (10 Hz)
f
max
max. frequency