Concepts and Features
R&S
®
ZNB/ZNBT
208
User Manual 1173.9163.02 ─ 38
The analyzer measures the intermodulation products of k
th
order IMk (where k = 3, 5,
7, 9) at the lower tone frequency minus (k – 1)/2 times the tone distance and at the
upper tone frequency plus (k – 1)/2 times the tone distance; see also
on page 209. For a two-port R&S
ZNB, a test setup with an
external generator and a combiner is required.
The lower tone signal is generated at port 1, the upper tone is provided by the external
generator. Both signals are combined externally and fed to the DUT input. The inter-
modulation quantities can be measured at the DUT output (transmitted wave b2). It is
possible to interchange the ports no. 1 and 2.
For a R&S
ZNB/ZNBT with two internal sources, you can use any combination of ana-
lyzer ports that are supplied by different internal sources to generate the lower and
upper tones (see
Chapter 4.7.7, "Internal Second Source"
on page 212). In the follow-
ing example, port 3 of a R&S
ZNB replaces the external generator. For a R&S
ZNBT
with more than 8 ports the lower and upper tone could be provided by ports 1 and 9,
for example.
An external combiner is required anyway.
Optional Extensions and Accessories
