Rohde & Schwarz ZVB 14, Service Manual

Page: 146 / 198

Instrument Construction and Function Description R&S ZVB
1145.1078.82 3.78 E-4
Testing the Reflectometer RM20
Generator levels
It is assumed that the synthesizer section (synthesizer1) associated with the reflectometer to be tested
is OK.
Loosen cable W514 (GEN -> coupler unit) at both ends and screw off at the generator output GEN.
Connect the generator output to the spectrum analyzer using the R&S SMA cable ().
Set the R&S ZVB to the CW sweep mode.
Set the frequencies listed in the table.
Set the power listed in the table.
Frequency Set power to Level on GEN output 2nd harmonic 3rd harmonic
10 MHz 10 dBm 13.0 dBm --- ---
100 MHz 10 dBm 13.0 dBm < - 21 dBc < - 21 dBc
1 GHz 10 dBm 13.2 dBm < - 21 dBc < - 21 dBc
4 GHz 10 dBm 13.7 dBm < - 21 dBc < - 21 dBc
8 GHz 10 dBm 14.3 dBm < - 21 dBc < - 21 dBc
9 GHz 10 dBm 14.5 dBm < - 21 dBc ---
12 GHz 10 dBm 15.0 dBm
---
---
15 GHz 5 dBm 7.5 dBm
---
---
18 GHz 5 dBm 8.0 dBm
---
---
20 GHz 5 dBm 8.3 dBm
---
---
With the stated levels, the cable loss must still be taken into account. For the specified cable it is
0.25 dB/GHz.
Receiver levels
The following is assumed:
•
The LO synthesizer section (synthesizer1 mod. 20, synthesizer2) associated with the reflectometer
to be tested is OK.
•
The network controller associated with the reflectometer to be tested is OK.
•
One reflectometer in the instrument is functioning.
Loosen cable W515 (coupler unit -> MEAS) and cable W518 (coupler unit -> REF) at both ends
and screw off at the MEAS and REF receiver inputs.
Connect the receiver input (MEAS or REF) to a functioning instrument port using an adapter cable.
Set the R&S ZVB to the CW sweep mode.
Set the frequencies and output levels for the port used for the measurement as indicated in the
table and read off the level for the receiver to be tested (wave quantity ax or bx).