User manual

Acquisition and Setup
R&S
®
RTO
39User Manual 1316.0827.02 ─ 06
Coupling
Selects the connection of the channel signal determining what part of the signal is used
for waveform analysis and triggering.
In addition to coupling, the signal can be filtered for high frequency rejection, see chap-
ter 2.3.4, "Digital Filter Setup", on page 49.
"DC 50 Ω"
Connection with 50 Ω termination, passes both DC and AC components
of the signal.
"DC 1 MΩ"
Connection with 1 MΩ termination, passes both DC and AC compo-
nents of the signal.
"AC"
Connection through DC capacitor, removes DC and very low-frequency
components.
SCPI command:
CHANnel<m>:COUPling on page 436
Offset
The offset voltage is subtracted to correct an offset-affected signal. The vertical center
of the selected channel is shifted by the offset value and the signal is re-positioned within
the diagram area. Negative offset values move the waveform up, positive values move
it down.
The offset of a signal is determined and set by the autoset procedure. The current value
is shown in the waveform label.
By default, the horizontal grid axis remains in the center when the offset is changed. To
shift the axis together with the waveform, disable Keep Y-grid fixed in "Display > Diagram
Layout".
SCPI command:
CHANnel<m>:OFFSet on page 438
Vertical scale
Defines the vertical scale in Volts per division. Increasing the scale compresses the dis-
play of the signal.
SCPI command:
CHANnel<m>:SCALe on page 437
Bandwith
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 15
"Full"
At full bandwidth, all frequencies in the specified range are acquired
and displayed. Full bandwidth is used for most applications.
DC
50 Ω
DC
1 MΩ
AC
Reference for Acquisition and Setup