Concepts and features
R&S
®
ZNA
279
User Manual 1178.6462.02 ─ 20
4.7.30
Receiver step attenuators
Options R&S
ZNAxx-B3y
Receiver step attenuators are used to adjust the received signal levels to the input
level range of the analyzer to avoid damage to the instrument, e.g. if the DUT is a
power amplifier.
Hardware option R&S
ZNAxx-B4y provides a receiver step attenuator for physical port
y of a R&S
ZNAxx. The attenuation values can be set between 0 dB and 35 dB (in 5
4.7.31
Internal pulse modulators
Option R&S
ZNAxx-B4y
Software-enabled hardware option R&S
ZNAxx-B4y provides an internal pulse modula-
tor for physical port y of a R&S
ZNAxx.
Switch times are limited to 1
μs or higher.
4.7.32
Trigger board
Option R&S
ZNA-B91
Hardware option R&S
ZNA-B91 adds the following BNC connectors to the
ZNA:
●
3 trigger in, 4 trigger out
●
4 external pulse modulator control signals (I/O switchable)
●
busy and ready for trigger indication
●
+28 V noise source control
●
RF OFF control input
All logic levels are LV-TTL 3.3
V, 5
V tolerant.
4.7.33
Direct source monitor access
R&S
ZNAxx-B161/B163/U161/U163
For instruments that are equipped with
itor options give access to the unattenuated generator signals of port 1 and 3. The sig-
nal does not have to pass the respective source step attenuator, which is particularly
useful for measurements requiring a low stimulus power, such as high gain (converter)
measurements. Taking the "attenuated" signal as the reference signal would result in
Optional extensions and accessories