Acquisition and waveform setup
R&S
®
RTE
176User Manual 1326.1032.02 ─ 20
Voltage between the positive and negative signal sockets
●
Positive single-ended input voltage (V
p
)
Voltage between the positive signal socket and the ground socket
●
Negative single-ended input voltage (V
n
)
Voltage between the negative signal socket and the ground socket
●
Common mode input voltage (V
cm
)
Mean voltage of positive and negative signal sockets referred to the ground socket,
respectively
Two of these voltages are independent values, the other two can be calculated:
R&S RT-ZD probes detect only differential input voltages and provide it to the oscillo-
scope. Common mode signals are suppressed by the probe. This characteristic is
described by the common mode rejection ratio (CMRR):
GainCommonMode
alGainDifferenti
CMRR
In addition, the R&S ProbeMeter of R&S RT-ZD differential probes can measure differ-
ential and common mode DC voltages. The measurement result is displayed on the
oscilloscope's screen. The common mode measurement of the R&S ProbeMeter
allows you to check the input voltage relative to ground. Thus, the CM measurement is
a convenient way to detect breaches of the operating voltage window, and the reason
of unwanted clippings.
5.2 Horizontal settings
The "Horizontal" menu provides the time base and acquisition configuration for channel
and spectrum waveforms:
● Setup.....................................................................................................................176
● Acquisition.............................................................................................................181
● Fast segmentation.................................................................................................183
5.2.1 Setup
Access: HORIZONTAL key
The "Setup" tab in the "Horizontal" dialog box provides the settings for the time axis
and the roll mode.
For background information, see Chapter 5.1.3, "Horizontal system", on page 171.
Horizontal settings
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