Input Impedance - R&S RT-ZM User Manual

®
R&S RT‑ZM
● Independent of probe settings for measurement mode and gain.
● Unique way to detect unexpected or inadmissible common mode voltages,
e.g. bias points - measurement of common mode DC voltages without recon-
necting the probe.
● Differential measurement range ±2.5 V + offset compensation setting.
Common mode measurement range ±7 V + common mode offset compensa-
tion setting.
4.6

Input impedance

The input signal loading caused by a probe tip module is determined by its input
impedance. The following plots show the single-ended and differential input impe-
dance of various RT-ZMA tip modules.
The single-ended input impedance is the loading seen by a single-ended source
from the single-ended input of the probe tip module. The differential input impe-
dance is the loading seen by a differential source from the differential input of the
probe tip module.
The measurement data used for these plots was made using a calibrated
Rohde & Schwarz vector network analyzers. Values below 20 MHz were deter-
mined using simulation data from equivalent circuits.
User Manual 1419.3128.02 ─ 05
Features and characteristics of modular probes
Input impedance
42