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®
R&S
RT-ZD40
5.2.1.2
Input Capacitance C
The input capacitance C
medium-frequency range (100 kHz to 1.0 GHz). It affects the settling time of the
input voltage in the case of fast transients.
5.2.1.3
RF Resistance R
The RF resistance R
maximum loading at very high frequencies above 1.0 GHz. Thus, the measure-
ment result depends on the source impedance of the DUT. The RF resistance
R
prevents the input voltage from rising immediately to its final value in the case
RF
of fast transients.
The resulting loading of a step signal at the input of the probe is shown in
ure
5-7.
Fig. 5-7: Signal loading caused by the R&S RT-ZD40 probe
User Manual 1410.5363.02 ─ 03
dm
causes the input impedance to decrease in the
dm
RF
determines the minimum input impedance and thus the
RF
Measurement Principles
Signal Loading of the Input Signal
fig-
41
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