User Manual

Typical Characteristics of the R&S RT-ZHD
R&S
®
RT-ZHD07/15/16/60
33User Manual 1800.2588.02 ─ 01
4 Typical Characteristics of the R&S RT-ZHD
The R&S RT-ZHD differential probe provides an electrical connection between the
DUT and the oscilloscope. The probe transfers the voltage of the electrical signal tap-
ped off the DUT to the oscilloscope, where it is displayed graphically. Although a probe
has a wide variety of specifications, these specifications can be grouped into two
classes of basic requirements:
●
High signal integrity of the transferred signal:
With an ideal probe, the output signal that is transferred to the base unit would be
identical to the input signal between the probe tips, and signal integrity would be
extremely high. Every real probe, however, transfers the input signal in altered
form. A good probe causes only minimum alterations. How the probe can fulfill this
requirement is mainly determined by its bandwidth and CMRR.
●
Low loading of the input signal:
Every probe is a load for the signal to be measured. This means that the signal to
be measured changes when the probe is connected. A good probe causes only a
minimum change to the signal, so that the function of the DUT is not adversely
affected. How the probe can fulfill this requirement is mainly determined by its input
impedance.
The parameters of a R&S RT-ZHD probe are specified for the short leads and the
safety alligator clips between the probe and the DUT. With longer or shorter connec-
tions, the connection inductance has a significant effect on the measurement.
4.1 Improve the Signal Integrity
To improve the signal integrity, apply the two hinged ferrite cores. Snap in the ferrites
to the probe cable near to the probe control box.
Figure 4-1: Probe cable with additional hinged ferrite cores
Improve the Signal Integrity