Rohde & Schwarz 1164.4391.03, Service Manual

Page: 37 / 254

R&S FSP Performance Test
116
4
.4556.82 1.9 E-1
Checking Bandwidth
Signal generator settings:
- Frequency: 128 MHz
- Level: -10 dBm
R&S FSP settings:
- [ PRESET ]
- [ AMPT : RF ATTEN MANUAL : 10 dB ]
- [ AMPT : 0 dBm ]
- [ FREQ : CENTER : 128 MHz ]
- [ BW : COUPLING RATIO : SPAN/RBW MANUAL : 3 : ENTER ]
Determine 3 dB bandwidth:
- [ MKR FCTN : N DB DOWN : 3 dB ]
- [ SPAN : {3 x RBW} ]
Refer to "Performance Test Report" table for values of RBW.
Note: To check the 10 MHz filter, the resolution bandwidth has to be set
manually to 10 MHz. All other bandwidths will be set automatically by
changing the span.
- [ BW : RES BW MANUAL : 10 MHz ]
Measurement:
- [ MKR : PEAK ]
The 3 dB bandwidth is displayed by the reading ´BW {bandwidth}´.
Checking Shape Factor
Note: To check the shape factor, you need to know the values of the 3 dB bandwidth . Please check
these values before performing this measurement.
Signal generator settings:
- Frequency: 128 MHz
- Level: 0 dBm
R&S FSP settings:
- [ PRESET ]
- [ AMPT : RF ATTEN MANUAL : 10 dB ]
- [ AMPT : 0 dBm ]
- [ FREQ : CENTER : 128 MHz ]
- [ BW : COUPLING RATIO : SPAN/RBW MANUAL : 20 ENTER ]
- [ BW : COUPLING RATIO : RBW/VBW NOISE [10] ]
- [ MKR FCTN : N DB DOWN : 60 dB ]
- [ SPAN : {20 x RBW} ]
Refer to "Performance Test Report" table for values of RBW.
Note: To check the 10 MHz filter, the resolution bandwidth has to be set
manually to 10 MHz. All other bandwidths will be set automatically by
changing the span.
- [ BW : RES BW MANUAL : 10 MHz ]
Measurement:
- [ MKR : PEAK ]
The 60 dB bandwidth is displayed by the reading ´BW {bandwidth}´.
Evaluation: The shape factor is calculated by BW (60 dB) / BW (3 dB).