R&S ZVB - Page 259

R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 244
Noise" setting minimizes the broadband noise, especially at low signal levels and for analyzers
with a large frequency range; see background information below.
 Src Pwr Result displays the source power according to the current channel and generator
attenuator settings.
Attenuation factors can be entered only for ports where a receiver or generator step attenuator is installed.
Generator and receiver 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
ZVA40, generator
ZVA40-B21
ZVA40-B22
ZVA40-B23
ZVA40-B24
ZVA40, receiver
ZVA40-B31
ZVA40-B32
ZVA40-B33
ZVA40-B34
ZVA50, generator
ZVA50-B21
ZVA50-B22
ZVA50-B23
ZVA50-B24
ZVA50, receiver
ZVA50-B31
ZVA50-B32
ZVA50-B33
ZVA50-B34
ZVA67, generator
ZVA67-B21
ZVA67-B22
ZVA67-B23
ZVA67-B24
ZVA67, receiver
ZVA67-B31
ZVA67-B32
ZVA67-B33
ZVA67-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 can be 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 automatic attenuator setting 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
Configuration dialog.
 A port and stimulus-dependent correction factor p
corr
introduced by a generator (source) power
calibration.