Rohde & Schwarz FSP3 Service Manual page 48

Performance Test
R&S FSP settings:
Evaluation:
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.
1164.4556.82
- [ 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
Depending on offset, refer to table below for values of a
Set phase noise marker
[ MKR : MARKER 2 : {offset} ]
Refer to table below for values of offset.
Note: Do not measure on a spurious signal.
The phase noise is displayed in the marker field by the reading
´Delta 2 [T1 PHN]´.
Phase noise measurement settings
Offset Span
100 Hz 20 Hz
1 kHz 200 Hz
10 kHz 2 kHz
100 kHz 10 kHz
1 MHz 100 kHz
} ]
FSP
RBW Reference level
10 Hz
100 Hz
300 Hz
3 kHz
30 kHz
1.20
R&S FSP
.
FSP
a
FSP
0 dBm 10 dB
0 dBm 10 dB
-10 dBm 10 dB
-20 dBm 0 dB
-20 dBm 0 dB
E-1