R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Instrument Functions
SIGNAL
COUNT
REFERENCE
FIXED
Analyzer Mode
• The marker measures only the position of the pixel on the trace and infers the
frequency of the signal from this value. The trace, however, contains only a limited
number of pixels. Depending upon the selected span, each pixel may contain
many measurement values, which therefore limits the frequency resolution.
• The resolution with which the frequency can be measured is proportional to the
measurement time. For this reason, the bandwidth is normally made as wide as
possible and the sweep time as short as possible. This results in a loss of
frequency resolution.
For the measurement with the frequency counter, the sweep is stopped at the reference
marker, the frequency is counted with the desired resolution and then the
sweep is allowed to continue.
The SIGNAL COUNT softkey switches the frequency counter on/off.
The frequency is counted at the position of the reference marker (MARKER 1). The
sweep stops at the reference marker until the frequency counter has delivered a
result. The time required for a frequency measurement depends on the selected frequency
resolution. The resolution is set in the side menu.
If no marker is enabled when the SIGNAL COUNT softkey is pressed, MARKER 1 is
switched on and set at the largest signal.
In addition, the SIGNAL COUNT function is displayed in the marker info field on the
screen with [Tx CNT].
Switching the SIGNAL COUNT function off is accomplished by pressing the softkey
again.
Remote command: CALC:MARK1:COUN ON;
CALC:MARK:COUN:FREQ?
The resolution of the frequency counter is set in the NEXT menu of the MARKER
menu. R&S FSQ offers counter resolutions between 0.1 Hz and 10 kHz.
REF FXD (ON OFF)
REF POINT LEVEL
REF POINT LVL OFFSET
REF POINT FREQUENCY
REF POINT TIME
PEAK SEARCH
The REFERENCE FIXED softkey defines the level and the frequency or time of
MARKER 1 as a reference for one or several delta markers. The measured values
for one or several markers displayed in the marker info field are derived from this
reference point instead of the current values of the reference marker (MARKER 1).
On actuating the softkey, reference fixed is switched on and thus, the level value
and the frequency, time or x-level value of MARKER 1 immediately become the reference
point.
Operating Manual 1313.9681.12 - 01 4.57