Measurement Principles
R&S
®
RT-ZS60
32
User Manual 1418.7342.02 ─ 04
Figure 4-7: Step response of the R&S
RT-ZS60 with a type 3 connection
4.2
Signal Loading of the Input Signal
The previous section dealt with the transfer function and step response of the
probe. This section describes how the probe influences the input signal.
4.2.1
Input Impedance
The input signal loading caused by the probe is determined by its input impe-
dance Z
in
. The
Figure 4-1
presents an equivalent circuit model.
Z
in
consists of the following probe-specific parameters.
●
Input resistance R
in
●
LF input capacitance C
LF
●
RF resistance R
RF1
+ R
RF2
●
RF input capacitance C
in
●
Minimum input impedance |Z
min
|
Signal Loading of the Input Signal
