Rohde & Schwarz FSP3 Service Manual page 58

Performance Test
Determining the level accuracy at 128 MHz
Test setup:
Signal generator settings:
Measurement:
R&S FSP settings:
Evaluation:
Checking frequency response
Test setup:
Signal generator settings:
R&S FSP settings:
1164.4556.82
Connect power sensor (item 9) to the power meter and execute
function ´ZERO´ when there is no signal applied to the power
sensor.
Connect power sensor to RF output of signal generator.
- Frequency 128 MHz
- Level -30 dBm
determine output power of the signal generator with the power
meter.
Connect RF output of the signal generator to RF input of the
R&S FSP.
- [ PRESET ]
- [ AMPT : RF ATTEN MANUAL : 10 dB ]
- [ AMPT : -20 dBm ]
- [ SETUP : PREAMP ON ]
- [ SPAN : 10 kHz ]
- [ BW : RES BW MANUAL : 10 kHz ]
- [ TRACE : DETECTOR : RMS ]
- [ FREQ : CENTER : 128 MHz ]
Set marker to peak of signal:
- [ MKR : PEAK ]
The difference between the signal levels measured with the power
meter and the R&S FSP (level reading of marker 1) reflects the
absolute level accuracy of the R&S FSP. It can be calculated as
follows:
Level accuracy
128MHz
Connect RF output of the signal generator to input of the power
splitter.
Connect output 1 of the power splitter to the power sensor / power
meter.
Connect output 2 of the Power splitter to RF input of the R&S FSP.
- Level 0 dBm
- Frequency 128 MHz
- [ PRESET ]
- [ AMPT : RF ATTEN MANUAL : 30 dB ]
- [ AMPT : 0 dBm ]
- [ SETUP : PREAMP ON ]
- [ SPAN : 100 kHz ]
- [ BW : RES BW MANUAL : 10 kHz ]
- [ TRACE : DETECTOR : RMS ]
- [ FREQ : CENTER : 128 MHz ]
1.30
= L - L
FSP powermeter
R&S FSP
E-1