User manual

Waveform Setup
R&S
®
Scope Rider RTH
41User Manual 1326.1578.02 ─ 04
Channel Index
Selects the channel to be set up. All settings in the channel menu belong to the
selected channel.
You can also press the channel key to select a channel. A long press of the channel
key opens the correspondent channel menu.
State
Switches the selected channel on or off.
Remote command:
CHANnel<m>:STATe on page 160
Coupling
Selects the connection of the input signal. The current coupling of each channel is
shown in the channel label at the display bottom.
"AC"
A high-pass filter removes the DC offset voltage from the input signal
if the DC component of a signal is of no interest. The waveform is
centered around zero volts.
"DC"
The signal passes the input unchanged.
Remote command:
CHANnel<m>:COUPling on page 163
Bandwidth
Selects the bandwidth limit. The full instrument bandwidth indicates the range of fre-
quencies that the instrument can acquire and display accurately with less than 3 dB
attenuation.
For analog applications, the highest signal frequency determines the required oscillo-
scope bandwidth. As a rule of thumb, the oscilloscope bandwidth should be 3 times
higher than the maximum frequency included in the analog test signal to measure the
amplitude with high accuracy.
Most test signals are more complex than a simple sine wave and include several spec-
tral components. A digital signal, for example, is built up of several odd harmonics. As
a rule of thumb, for digital signals the oscilloscope bandwidth should be 5 times higher
than the clock frequency to be measured.
The oscilloscope is not a stand-alone system. You need a probe to measure the signal,
and the probe has a limited bandwidth, too. The combination of oscilloscope and probe
creates a system bandwidth. To reduce the effect of the probe on the system band-
width, the probe bandwidth should exceed the bandwidth of the oscilloscope, the rec-
ommended factor is 1.5 x oscilloscope bandwidth.
"Full"
At full bandwidth, all frequencies in the specified range are acquired
and displayed. Full bandwidth is used for most applications.
"x MHz, x kHz"
Frequency limit. Frequencies above the selected limit are removed to
reduce noise at different levels. Limited bandwidth is indicated in the
channel label.
Vertical Setup