Preparing for Use
R&S
®
ZVA-Z90E / -Z110E
14
Getting Started 1307.7197.62 ─ 08
Risk of connector and cable damage
Tightening the cables too strongly can damage cables and connectors. Loose tighten-
ing can result in inaccurate measurement results.
Therefore always use an appropriate torque wrench, suitable for the type of connector.
Rohde & Schwarz offers an optional 5/16” torque wrench that fits for SMA, 3.5 mm,
2.92 mm and 1.85 mm connectors (order number 1328.8534.35). Similar wrenches are
available for other sizes of spanner, too. See ordering information in R&S
ZVA-Z110E
data sheet or product brochure.
Connecting the input connectors (RF IN, LO IN)
The type of cable required for connecting the input connectors depends on the type of
the network analyzer / external generator. Since the converter inputs are fitted with
3.5
mm female connectors, preferably use a cable with 3.5
mm male connectors (e.g.
R&S
ZV-Z193, order number 1306.4520.xx). Cables with SMA or 2.92
mm male con-
nectors (e.g. R&S
ZV-Z195, order number 1306.4536.xx) are mechanically compatible,
with a tolerable electrical mismatch.
For a complete test setup for a 2-port transmission measurement, as shown in
, cable lengths of about 1 m are recommended. For a setup with only one con-
verter, possibly shorter cable lengths are sufficient. Always use cables with low attenu-
ation and excellent phase stability.
Depending on the NWA model, possibly additional 1.85
mm to 2.92
mm adapters are
required to connect the cables.
1. Connect port 1 or port 2 of the analyzer to RF IN of the converter.
2. Connect port 3 or port 4 of the analyzer to LO IN of the converter.
For NWAs with
4 sources
(R&S
ZVA24 var.
28, R&S
ZVA40 var.
48 or
R&S
ZVA67), connect LO IN to
port 4 only
. For a two-port converter setup on
these instruments (or if an external generator provides the LO signal), use a
split-
ter
to distribute the LO signal to the LO IN ports of the converters. If the outputs of
the splitter are too close to mount two cables in parallel, use angled adapters. See
If you use a power splitter and the phases of S
21
and S
12
deviate or drift by equal
magnitude but opposite sign, check the phase stability of the LO paths of both con-
verters.
The required adapters and splitters are offered as complementary adaption kits (see
Putting the Converter into Operation
