Preparing the Extension Unit for Use
R&S
®
ZVAX24
11
Quick Start Guide 1312.7985.62 ─ 03
–
REF OUT (ZVAX) to REF IN (NWA). It may be necessary to loop an external
attenuator (at least 33 dB for 43 dBm max power) into this connection.
–
MEAS OUT (ZVAX) to MEAS IN (NWA). It may be necessary to loop an external
attenuator (at least 33 dB for 43 dBm max power) into this connection.
–
3.5 mm connector (ZVAX) to the output of the DUT
In the figure below, red lines denote signal paths where the power may exceed the max-
imum input power of the network analyzer.
Fig. 2-2: Connection of PORT 2 for high receiver powers
Maximum RF power and DC offset
An input power of +43 dBm is allowed only if none of the options R&S ZVAX-B203, "Low
Noise Preamplifier", R&S ZVAX-B252, "Harmonic Filter Source Port 2", and R&S ZVAX-
B272, "Pulse Modulator Source Port 2", is switched into the RF measurement signal path
of port 2. Refer to the data sheet of your network analyzer.
Please observe the maximum RF output power at PORT 1 and the maximum RF input
power at the network analyzer ports (see data sheet). 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 an 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 R&S
ZVA port 2 source.
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