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Common Measurement Settings

R&S

FSW

361User Manual 1173.9411.02 ─ 43

Clipping effects due to incorrect common mode offset

The R&S

RT-ZD10/20/30 probe measures only differential input signals. Common

mode signals are suppressed by the probe. Therefore, the common mode offset com-

pensation is not directly visible in the result display. An incorrect common mode offset

compensation can lead to unwanted clipping effects. Measuring the common mode

input voltage using the R&S ProbeMeter is a convenient way to detect breaches of the

operating voltage window.

For more information on common mode offset see the R&S

RT-ZD10/20/30 User Man-

ual.

RF Probes

Generally, you can perform frequency sweeps on active probes connected to the

BASEBAND INPUT connectors by redirecting the input to the RF Input path (see "Ana-

log Baseband Probes" on page 359). However, this measurement setup is restricted to

a maximum frequency of 5 GHz by the BASEBAND INPUT connectors. Furthermore,

this setup is restricted to applications that can process I/Q data.

Connecting probes directly to the RF Input connector allows you to make use of the

maximum frequency range provided by the probe and the R&S FSW, which can be

much higher than 5 GHz.

Furthermore, input from probes at the RF Input connector can be analyzed in all

R&S FSW applications, including applications that do not process I/Q data, and do not

support the optional Analog Baseband Interface (R&S FSW-B71).

Only active modular probes can be connected to the RF Input connector via the

optional R&S RT-ZA9 adapter.

To connect an active probe to the RF Input

1. Connect the R&S RT-ZA9 adapter to the RF Input connector on the R&S FSW.

2. Connect the R&S RT-ZA9 adapter's USB cable to a USB connector on the

R&S FSW.

Data Input and Output

R&S FSW Series User Manual

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