Rohde & Schwarz FSP3 - Page 41

R&S FSP Performance Test
1164.4556.82 1.13 E-1
Checking frequency response
Test setup:  Connect RF output of signal generator to input of power splitter.
 Connect output 1 of power splitter to power sensor / power meter.
 Connect output 2 of divider to RF input of the R&S FSP.
Signal generator settings:
- Level 0 dBm
- Frequency 128 MHz
R&S FSP settings:
- [ PRESET ]
- [ AMPT : RF ATTEN MANUAL : 10 dB ]
- [ AMPT : 0 dBm ]
- [ SPAN : 100 kHz ]
- [ BW : RES BW MANUAL : 10 kHz ]
- [ TRACE : DETECTOR : RMS ]
- [ FREQ : CENTER : 128 MHz ]
Reference measurement:
 Determine signal level L
powermeter
.
 Set marker to peak of signal:
- [ MKR  : PEAK ]
The signal level L
FSP
is displayed by the level reading of marker 1.
Ref
128MHz
= L
FSP
- L
powermeter
Measurement
Signal generator settings:
- Frequency f
fresp
Refer to "Performance Test Report" table for values of f
fresp
.
Power meter settings:
Determine signal level L
powermeter
. To achieve higher accuracy,
compensating for the frequency response of the power sensor is
recommended.
R&S FSP settings:
- [ FREQ : CENTER : {f
fresp
} ]
Refer to "Performance Test Report" table for values of f
fresp
.
 - Set marker to peak of signal:
- [ MKR  : PEAK ]
The signal level L
FSP
is displayed by the level reading of marker 1.
Evaluation:
The frequency response can be calculated as follows:
Frequency response = L
FSP
- L
powermeter
- Ref
128 MHz