Rohde & Schwarz ZVB 14, Service Manual

Page: 141 / 198

R&S ZVB Instrument Construction and Function Description
1145.1078.82 3.73 E-4
Synthesizer-DS 1302.5180. xx
Source 1 to 4 (set port1 to 4 active)
Frequency
(R&S ZVB
setting)
Source Level 2nd harmonic 3rd harmonic SSB noise
carrier offset
100 kHz
300 kHz +3 dBm to -5 dBm < -27 dBc < -30 dBc -130 dBc
100 MHz +3 dBm to -5 dBm < -27 dBc < -30 dBc -130 dBc
1 GHz +3 dBm to -5 dBm < -27 dBc < -30 dBc -126 dBc
2 GHz +3 dBm to -5 dBm < -27 dBc < -30 dBc -120 dBc
3 GHz +3 dBm to -5 dBm < -27 dBc < -30 dBc -116 dBc
4 GHz +3 dBm to -5 dBm < -27 dBc < -30 dBc -112 dBc
6 GHz +3 dBm to -7 dBm < -27 dBc < -30 dBc -108 dBc
8 GHz +3 dBm to -7 dBm < -27 dBc < -30 dBc -105 dBc
Isolation of source switch1 to 4
R&S ZVB frequency 8 GHz
Port no. Port setting Source output Isolation
1
Port1 inactive
Port2 active X165
X166
-90 dBc ±5 dB
2
Port1 active
Port2 inactive X165
X166 -90 dBc ±5 dB
3
Port3 inactive
Port4 active X168
X169
-90 dBc ±5 dB
4
Port3 active
Port4 inactive X168
X169 -90 dBc ±5 dB
The cable loss must also be taken into account at the stated levels. For the specified cable it is
0.25 dB/GHz (0.5 m) 0.5 dB/GHz (1 m).
The board must be replaced if the level is more than 2 dB below the specified value or the other values
are more than 2 dB above their specified value.
Synthesizer2 or synthesizer1 for R&S ZVB4/8 2-ports
Disconnect the LO cable at the LO divider (or at the reflectometer).
Connect the end of the LO cable to the spectrum analyzer input using an adapter cable and adapter
SMA-N.
N.B.: Bend the source cable as little as possible , if necessary secure adapter cable with
adhesive tape.
Set the frequencies listed in the table above on the R&S ZVB and check the values.