Rohde & Schwarz FSP7 - Adjusting the Level Measurement Accuracy

Manual Adjustment R&S FSP
1164.4556.82 2.4 E-1
Adjusting the level measurement accuracy
Test equipment:
- Signal generator (Section "Measurement Equipment", item 2):
frequency 128 MHz
level -30 dBm
- power meter (Section "Measurement Equipment", item 3)
- power sensor (Section "Measurement Equipment", item 4)
frequency 128 MHz
maximum power P
max
 1 PW
meter noise  20 pW
RSS  0.8% referred to indicated power
impedance Z = 50 
Power meter settings:  connect power sensor to power meter and carry out function
´ZERO´ when no signal is applied to the power sensor.
 connect power sensor to RF output of signal generator.
Signal generator settings:
- frequency 128 MHz
- level –30 dBm ± 0.05 dB
 use power meter for exact level adjustment.
Test setup:  connect RF output of the signal generator to RF input of the
R&S FSP
Overall calibration of R&S
FSP:
- [ PRESET ]
- [ CAL : CAL TOTAL ]
R&S FSP settings:
- [ FREQ : CENTER : 128 MHz ]
- [ SPAN : 15 kHz ]
- [ BW : RES BW MANUAL : 10 kHz ]
- [ BW : VID BW MANUAL : 1 kHz ]
- [ TRACE : DETEKTOR : RMS ]
- [ AMPT : REF LEVEL : -20 dBm ]
- [ AMPT : RF ATTEN MANUAL : 10 dB ]
Reference measurement
 set marker to peak of signal
-[ MKR SEARCH : PEAK ]
 set reference to peak of signal
-[ MKR : REFERENCE FIXED ]
 switch internal reference generator to RF input
- [ SETUP : SERVICE : INPUT CAL ]
 set marker to peak of signal
- [ MKR  : PEAK ]
Adjustment: The reading ´Delta [T1 FXD]´ displays the difference between the
output level of the signal generator and the level of the calibration
source.