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Preparing the Extension Unit for Use
R&S
®
ZVAX24
10 Quick Start Guide 1312.7985.62 ─ 03
Maximum RF power and DC offset
Please observe the maximum RF output power at PORT 1 of the extension unit and the
maximum RF input power at the network analyzer ports (see data sheets). If the DUT
provides a high input power at the 3.5 mm test port connector of the extension unit,
external attenuators may be needed to prevent excess input power at REF IN and MEAS
IN (NWA).
In addition, it is important that the signal fed in at the 3.5 mm test port connector contains
no DC offset, as this may impair the measurements and even cause damage to the
extension unit.
2.1.3.2 RF Connectors Port 2
The Port 2 connectors allow components inside the extension unit to be looped into the
RF signal path of the network analyzer (NWA) test port 2. The connectors must be con-
nected to the corresponding connectors provided by the NWA option R&S ZVA24-B16
(see
chapter 2.1.3.4, "Rules for RF Connections" , on page 12).
The following connectors are available:
●
Two 2.92 mm connectors MEAS IN and MEAS OUT. To modify the test signal mea-
sured at analyzer port 2, connect the 2.92 mm connectors as follows:
–
MEAS IN (ZVAX) to MEAS OUT (NWA)
– MEAS OUT (ZVAX) to MEAS IN (NWA)
●
A 2.92 mm MONITOR connector. This connector is intended e.g. for an external
spectrum analyzer used to monitor the measured signal.
●
Option R&S ZVAX-B292, "High Power Coupler Port 2", provides two additional 2.92
mm connectors labeled SOURCE IN and REF OUT plus a 3.5 mm test port connector
PORT 2. The MEAS IN connector is not installed. This option extends the receiver
power range to values up to 20 W (+43 dBm) at the PORT 2 connector. The "High
Power Coupler Port 2" replaces the internal coupler at the network analyzer port 2.
The PORT 2 connector replaces the respective test port connector of the network
analyzer. To provide an RF source signal at the PORT 2 connector and measure a
high-power input signal at PORT 2, connect the extension unit as follows:
–
SOURCE IN (ZVAX) to SOURCE OUT (NWA). It may be necessary to loop an
external isolator with high power termination into this connection in order to pre-
vent the port 2 source of the NWA from being damaged.
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