Measurement Principles
R&S
®
RT-ZS10E/10/20/30
32
User Manual 1410.3531.02 ─ 07
0
50
100
150
200
250
300
350
0
1
2
3
4
5
6
Input/Output
voltage
in mV
Time in ns
Vs
Vout signal clip
Vout signal lead
Figure 4-7: Step response of the R&S
RT-ZS30 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
●
Input capacitance C
in
●
RF resistance R
RF
Signal Loading of the Input Signal
