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Concepts and Features
R&S
®
ZNB/ZNBT
234
User Manual 1173.9163.02 ─ 53
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.
5.7.18
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).
5.7.18.1
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
at the output of the DUT and the power of the incident wave a
n
at the input of the DUT;
hence:
DC
n
m
P
a
b
PAE
2
2
|
|
|
|
Positive PAE values indicate a gain in the RF power, negative values an attenuation.
The PAE is always smaller than 1.
The PAE measurement is based on the standard test setup for forward S-parameter
measurements on a 2-port DUT. An additional measurement to determine the supplied
power P
DC
is required.
Optional Extensions and Accessories