Acquisition and Waveform Setup
R&S
®
RTM20xx
30User Manual 1317.4726.02 ─ 01
Coupling........................................................................................................................30
Termination...................................................................................................................30
Bandwidth.....................................................................................................................30
Offset.............................................................................................................................31
Invert.............................................................................................................................31
Y-Scale..........................................................................................................................31
Probe.............................................................................................................................31
Deskew.........................................................................................................................31
Threshold......................................................................................................................31
Label.............................................................................................................................32
Coupling
Selects the connection of the input signal. The current coupling of each channel is shown
in the waveform labels above the grid.
"AC"
A 2 Hz high-pass filter is placed into the signal path that removes the
DC offset voltage from the input signal. AC coupling is labeled with ≈.
"DC"
DC coupling passes the input signal unchanged. It is labeled with ≅.
"GND"
Connects the input virtually to the ground. All channel data is set to a
constant ground value. Ground connection is labeled with
.
Remote command:
CHANnel<m>:COUPling on page 289
Termination
Adjusts the input impedance of the instrument to the impedance of the DUT. By default,
the oscilloscope has an input impedance of 1 MΩ || 13 pF. If an active probe is used, the
termination is read out from the probe - usually it is 50 Ω.
"50Ω"
In measurement systems that are dimensioned for a characteristic
impedance of 50 Ω, reflections along the signal path are minimized by
setting the input resistor of the oscilloscope also to 50 Ω. This increases
the accuracy of measurement results. 50 Ω termination is identified for
each channel by the icon Ω in the waveform label.
"1 MΩ"
The high input resistor minimizes the loading effect on the device under
test. This value is set automatically if a passive probe is connected and
cannot be changed.
Remote command:
CHANnel<m>:COUPling on page 289
Bandwidth
Selects the bandwidth limit. The specified full bandwidth indicates the range of frequen-
cies that the instrument can acquire and display accurately with less than 3dB attenua-
tion. The probe has also a limited bandwidth and thus affects the resulting system band-
width.
See also: chapter 2.1.1.3, "Bandwidth", on page 12
"Full"
At full bandwidth, all frequencies in the specified range are acquired
and displayed. Full bandwidth is used for most applications.
Reference for Waveform Setup
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