Concepts and features
R&S
®
ZNA
239
User Manual 1178.6462.02 ─ 20
O U T
O U T
I N
I N
M E A S
SO U RCE
REF
O U T
O U T
I N
I N
M E A S
SO U RC E
REF
Figure 4-22: Internal combiner
For a 4-port instrument, the tones must be generated at VNA ports 1 and 3, the com-
bined signal is output to port 1.
For a R&S
ZNA that is equipped with option R&S
ZNAxx-B16, Direct Generator/
Receiver Access but not with an internal combiner, the following test setup is recom-
mended:
O U T
O U T
IN
IN
MEAS
SO URCE
REF
O U T
O U T
IN
IN
MEAS
SO URCE
REF
Figure 4-23: Direct access to lower-tone port, external combiner
The lower tone is generated at a VNA port, the upper tone is also provided by the ana-
lyzer (4-port models only) or by an external generator. The signals are combined exter-
nally and fed to the SOURCE IN connector at the lower tone port. Thus the superim-
posed signals are available at the lower tone port and can be fed to the DUT input. The
IF output signal is measured at another VNA port.
As an alternative to the test setup with external combiner, you can also combine the
two tones using the coupler in the test set of the upper-tone port:
Optional extensions and accessories
