R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Instrument Functions
REF POINT
LEVEL
REF POINT LVL
OFFSET
REF POINT
FREQUENCY
Analyzer Mode
The REF POINT LEVEL softkey activates an entry box for the input of a reference
level other than the reference marker level. The function is identical to that of the
softkey with the same name in the MARKER menu (MKR).
Remote command: CALC:DELT1:FUNC:FIX:RPO:Y -10dB
The REF POINT LVL OFFSET softkey activates an entry box for the input of an
additional level offset for the phase noise calculation.
This level offset is set to 0 dB on when the REFERENCE FIXED or PHASE NOISE
function is enabled.
Remote command: CALC:DELT:FUNC:FIX:RPO:Y:OFFS 10dB
The REF POINT FREQUENCY softkey activates an entry box for the manual input
of a reference frequency for the REFERENCE FIXED or PHASE NOISE function.
Remote command: CALC:DELT1:FUNC:FIX:RPO:X 10.7MHz
PEAK SEARCH The PEAK SEARCH sets the reference point level for delta marker 2 in the selected
measurement window to the peak of the selected trace.
AUTO PEAK
SEARCH
Remote command: CALC:DELT:FUNC:FIX:RPO:MAX
The AUTO PEAK SEARCH softkey activates an automatic peak search for the reference
fixed marker 1 at the end of each particular sweep.
This function may be used for tracking of a drifting source during a phase noise
measurement. The delta marker 2, which shows the phase noise measurement
result, keeps the delta frequency value. Therefore the phase noise measurement
leads to reliable results in a certain offset although the source is drifting. Only if the
marker 2 is reaching the border of the span, the delta marker value is adjusted to be
within the span. In these cases, choose a larger span.
Remote command: CALC:DELT:FUNC:PNO:AUTO ON | OFF
Measurement example
The phase noise of a CW signal at 100 MHz with 0 dBm level is to be measured at
800 kHz from the carrier
[PRESET] The R&S FSQ is set to the default setting.
[CENTER: 100 MHz] The center frequency is set to 100 MHz.
[SPAN: 2 MHz] The span is set to 2 MHz.
[AMPT: 0 dBm] The reference level is set to 0 dBm.
[MKR FCTN] MARKER 1 is switched on and positioned at the maximum
of the displayed trace.
[PHASE NOISE: 800 kHz] The phase noise measurement is switched on. The
delta marker is positioned on the main marker and the
measured phase noise value is displayed in the marker
info field. The sample detector is used and the video
bandwidth is set to 3 × RBW. When the phase noise
measurement function is enabled, the entry of the delta
marker frequency is activated. It can be entered
directly.
4.66 Operating Manual 1313.9681.12 - 01