Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 285 / 813

R&S
®
ZVA/ZVB/ZVT Channel Menu
1145.1084.12 4.123 E-6
The Step Attenuators dialog consists of a non-editable column listing the received waves b1 to bn (Port
#) and a column to enter the attenuation for each wave (Attenuation) . n is equal to the total number of
test ports of the analyzer. Attenuation factors can be entered for ports only where a receiver step
attenuator is installed.
Receiver and generator step attenuators
•
Receiver and generator step attenuators can be purchased as ZVA options. The following
attenuators are available:
Port 1 Port 2 Port 3 Port 4
ZVA8, generator
ZVA8-B21 ZVA8-B22 ZVA8-B23 ZVA8-B24
ZVA8, receiver
ZVA8-B31 ZVA8-B32 ZVA8-B33 ZVA8-B34
ZVA24,
generator
ZVA24-
B21
ZVA24-
B22
ZVA24-
B23
ZVA24-
B24
ZVA24, receiver
ZVA24-
B31
ZVA24-
B32
ZVA24-
B33
ZVA24-
B34
•
Refer to the data sheet for detailed ordering information and technical specifications.
Attenuation factors for the received waves and the generated waves serve different purposes:
•
Received wave factors are used to adjust the received signal levels to the input level range of
the analyzer in order to avoid damage to the instrument, e.g. if the DUT is a power amplifier .
The range of attenuation values depends on the analyzer model.
Port-specific attenuation factors can be set in the
Receiver section of the Port Configuration
dialog .
•
Generated wave factors are used to protect a sensitive DUT from excess input levels . The
attenuation values are set automatically. The range of values depends on the analyzer model.
Port-specific attenuation factors can be set in the
Source section of the Port Configuration
dialog .
Automatic generator attenuation
The aim of the automaticattenuatorsetting is to ensure that the analyzer can perform the entire sweep
without switching the generator step attenuators. The output power p
el
at each port depends on the
following settings:
•
The channel power p
ch
(the Power set in the Channel – Power Bandwidth Average menu).
•
The port-specific power offset p
b
(for arbitrary sweeps) and the port and frequency-dependent
power slope factor p
Slope
(for frequency sweeps) defined in the Receiver section of the Port