Waveform setup
R&S
®
RTA4000
58
User Manual 1335.7898.02 ─ 08
Position
Moves the selected signal up or down in the diagram. While the offset sets a voltage,
position is a graphical setting given in divisions. The visual effect is the same as for off-
set.
Remote command:
Ground
Connects the input to a virtual ground. All channel data is set to 0 V. Ground connec-
tion is labeled with . The coupling is not affected by the ground setting.
Remote command:
Invert
Turns the inversion of the signal amplitude on or off. To invert means to reflect the volt-
age values of all signal components against the ground level. Inversion affects only the
display of the signal but not the trigger.
For example: if the oscilloscope triggers on the rising edge, the trigger is not changed
by inversion, but the actually rising edge is displayed as falling edge.
Inversion is indicated in the waveform labels by line above the channel name.
Remote command:
Deskew
Sets a time delay for the selected channel.
Deskew compensates delay differences between channels caused by the different
length of cables, probes, and other sources. Correct deskew values are important for
accurate triggering. Signals that are routed over lines with different lengths have a dif-
ferent propagation delay. This delay can lead to a non-synchronous waveform display.
For example, a coax cable with a length of 1 meter has a propagation delay of typically
5.3 ns.
Remote command:
Zero Adjust
Differences in DUT and oscilloscope ground levels can cause larger zero errors, which
affect the waveform. If the DUT is ground-referenced, the "Zero Adjust" corrects the
zero error and sets the probe to the zero level.
You can assess the zero error by measuring the mean value of a signal that returns
zero.
Remote command:
Waveform Color
Selects the color scale for the waveform color. Each scale comprises a set of colors,
where each color represents a certain frequency of occurrence.
Vertical setup
