R&S ZNB - 5.7.22 Receiver Step Attenuators; 5.7.23 DC Inputs; 5.7.23.1 Power Added Efficiency

Concepts and Features
R&S
®
ZNB/ZNBT
238User Manual 1173.9163.02 ─ 55
5.7.22 Receiver Step Attenuators
Various Options (see tables below)
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.
The attenuation values can be set between 0 dB and 30 dB (in 10 dB steps); see "Step
Attenuators" on page 384. The following step attenuators are available:
Table 5-24: R&S ZNB
Analyzer type Port 1 Port 2 Port 3 Port 4
R&S ZNB4 R&S ZNB4-B31 R&S ZNB4-B32 R&S ZNB4-B33 R&S ZNB4-B33
R&S ZNB8 R&S ZNB8-B31 R&S ZNB8-B32 R&S ZNB8-B33 R&S ZNB8-B33
●
Receiver step attenuators are not available for R&S ZNB20|40.
●
Receiver step attenuators for R&S ZNB4|8 can be retrofitted at Rohde & Schwarz
service.
Table 5-25: R&S ZNBT8
Ports 1 to 4 Ports 5 to 8 Ports 9 to 12 Ports 13 to 16 Ports 17 to 20 Ports 21 to 24
R&S ZNBT8-
B361
R&S ZNBT8-
B362
R&S ZNBT8-
B363
R&S ZNBT8-
B364
R&S ZNBT8-
B365
R&S ZNBT8-
B366
●
Receiver step attenuators are not available for the R&S ZNBT20|26|40.
●
Receiver step attenuators for R&S ZNBT8 can be retrofitted at Rohde & Schwarz
service.
5.7.23 DC Inputs
Option R&S ZNB/ZNBT-B81
This hardware option provides four rear panel connectors labeled DC INPUT 1 ... 4
which can be used for DC measurements in different voltage ranges. The DC inputs
are also needed for the measurement of the Power Added Efficiency (PAE).
5.7.23.1 Power Added Efficiency
The Power Added Efficiency (PAE) is the ratio of the added RF power generated by an
active two-port device (e.g. an amplifier) to the supplied DC power P
DC
. The added RF
power can be expressed as the difference between the power of the outgoing wave b
m
Optional Extensions and Accessories