Preparing the Extension Unit for Use
R&S
®
ZVAX-TRM
15
User Manual 1325.1268.02 ─ 04
It is recommendable to switch the extension unit to standby state or switch it off by the
rear panel AC power switch if it is not used for some time.
3.2.2 USB Connectors
The R&S
ZVAX-TRM provides two USB type
A connectors on the front panel and
another one on the rear panel.
Once the extension unit is connected to the network analyzer via the type
B USB con-
nector on the rear panel of the extension unit (see
A connectors are functionally equivalent to the USB
type
A connectors of the network analyzer (USB hub functionality). They can be used
to connect supported USB devices (calibration units, power meters, keyboard, mouse,
printer, USB stick, etc.) to the R&S
ZVA/ZVT.
3.2.3 RF Connectors
ZVAX-TRM provides four groups of RF connectors.
The groups are labeled 1 to 4, indicating the related port on the R&S
ZVA/ZVT.
The RF connectors in the upper part of the front panel are used to establish the
required SOURCE, REF and MEAS paths between analyzer and extension unit (see
Chapter 3.4.5, "Connecting the extension unit to the R&S
Groups 1 and 2 each comprise a
test port connector
, located at the vertical center of
the front panel. It is equipped with a high power directional coupler (up to +43 dBm)
and replaces the corresponding test port connector on the NWA.
The RF connectors in the lower part of the front panel provide direct access to the
SOURCE and MEAS path of ports 1 and 2. If not required, an extension path can be
bypassed using electronic transfer switches (controlled by the NWA firmware); there is
no need to jumper the IN and OUT connectors.
Maximum RF power and DC offset
Observe the maximum RF output power at the test ports on the extension unit and the
maximum RF input power at the network analyzer ports (see data sheets). If the TX or
RX power at the test port connector of the extension unit is high, external attenuators
may be required to prevent excess input power at MEAS IN, SOURCE OUT, and REF
IN (NWA). These external attenuators can be inserted at the respective port or via the
external SRC/MEAS path access.
In addition, it is important that the signal fed in at the test port connector contains no
DC offset, as this may impair the measurements and even cause damage to the exten-
sion unit.
Front Panel Tour