Checking Reference Level Switching (If Gain) - Rohde & Schwarz FSP3 Service Manual

R&S FSP

Checking Reference Level Switching (IF Gain)

Test principle:
Test equipment:
Test setup:
Signal generator settings:
Step attenuator settings:
R&S FSP settings:
Reference measurement:
1164.4556.82
The IF gain of the R&S FSP can be switched from 0 to 50 dB by
changing the reference level at fixed RF attenuation. To prevent the IF
gain accuracy from being confused with the log amplifier accuracy, it
is determined by comparison using an external precision attenuator.
Signal generator (refer to "Measurement Equipment", item 3)
-
Frequency
Maximum level
Step attenuator (refer to "Measurement Equipment", item 11)
-
Frequency
Attenuation
Attenuation accuracy
1
) If a step attenuator with lower accuracy is used, correction
of the measured attenuation is recommended.
Connect RF output of the signal generator to RF input of the step
attenuator.
Connect RF output of the step attenuator to RF input of the
R&S FSP.
- Frequency 128 MHz
- Level -10 dBm
Attenuation 20 dB
- [ PRESET ]
- [ FREQ : CENTER : 128 MHz ]
- [ SPAN : 2 kHz ]
- [ BW : RES BW MANUAL : 1 kHz ]
- [ BW : VIDEO BW MANUAL : 100 Hz ]
- [ TRACE : DETECTOR : RMS ]
- [ AMPT : RF ATTEN MANUAL : 10 dB ]
- [ AMPT : -10 dBm ]
Set marker to peak of signal:
- [ MKR : PEAK ]
Set reference to peak of signal:
- [ MKR : REFERENCE FIXED ]
1.17
Performance Test
128 MHz
-10 dBm
128 MHz
0 to 60 dB in 1 dB steps
1
< 0.1 dB )
E-1