Rohde & Schwarz FSP7 - Page 48

Performance Test R&S FSP
1164.4556.82 1.20 E-1
R&S FSP settings:
- [ PRESET ]
- [ FREQ : CENTER : 498 MHz ]
- [ AMPT : 0 dBm ]
- [ AMPT : RF ATTEN MANUAL : 10 dB ]
- [ SPAN : {span} ]
Depending on offset, refer to table below for values of span.
- [ BW : COUPLING RATIO : RBW/VBW NOISE[10] ]
- [ BW : RBW MANUAL : {RBW} ]
Depending on offset, refer to table below for values of RBW.
- [ TRACE 1 : AVERAGE ]
- [ SWEEP : SWEEP COUNT : 20 : ENTER ]
 Activate phase noise marker:
- [MKR FCTN : PHASE NOISE ]
- [ FREQ : CENTER : {498 MHz + offset} ]
Refer to table below for values of offset.
- [ AMPT : {reference level} ]
Depending on offset, refer to table below for values of reference
level.
- [ AMPT : RF ATTEN MANUAL : {a
FSP
} ]
Depending on offset, refer to table below for values of a
FSP
.
 Set phase noise marker
[ MKR : MARKER 2 : {offset} ]
Refer to table below for values of offset.
Note: Do not measure on a spurious signal.
Evaluation: The phase noise is displayed in the marker field by the reading
´Delta 2 [T1 PHN]´.
Phase noise measurement settings
Offset Span RBW Reference level a
FSP
100 Hz 20 Hz 10 Hz 0 dBm 10 dB
1 kHz 200 Hz 100 Hz 0 dBm 10 dB
10 kHz 2 kHz 300 Hz -10 dBm 10 dB
100 kHz 10 kHz 3 kHz -20 dBm 0 dB
1 MHz 100 kHz 30 kHz -20 dBm 0 dB
Note: To obtain a precise measurement of the phase noise at high offsets, the level used at the
R&S FSP input is 20 dB higher than the reference level. To reduce the measurement time,
the phase noise is measured with a small span around the frequency offset. This prevents
the R&S FSP from being overloaded.