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Display Modes
Reference
XY format compares the voltage levels of two waveform records point by
point. That is, the digitizing oscilloscope displays a graph of the voltage of one
waveform record against the voltage of another waveform record. This mode
is particularly useful for studying phase relationships.
To set the display axis format:
Press DISPLAY ➞ Format (main) ➞ XY or YT (side).
When you choose the XY mode, the input you have selected is assigned to
the X-axis, and the digitizing oscilloscope automatically chooses the Y-axis
input (see Table 3-3).
Table 3-3: XY Format Pairs
X-Axis Channel
(User Selectable)
Y-Axis Channel
(Fixed)
Ch 1 Ch 2
Ch 3 (TDS 644A & TDS 640A)
(Aux 1 on the TDS 524A &
TDS 620A)
Ch 4 (TDS 644A & TDS 640A)
(Aux 2 on the TDS 524A &
TDS 620A)
Ref 1 Ref 2
Ref 3 Ref 4
For example, if you press the CH 1 button, the digitizing oscilloscope will
display a graph of the channel 1 voltage levels on the X-axis against the
channel 2 voltage levels on the Y-axis. That will occur whether or not you are
displaying the channel 2 waveform in YT format. If you later press the WAVE-
FORM OFF button for either channel 1 or 2, the digitizing oscilloscope will
delete the XY graph of channel 1 versus channel 2.
Since selecting YT or XY affects only the display, the horizontal and vertical
scale and position knobs and menus control the same parameters regardless
of the mode selected. Specifically, in XY mode, the horizontal scale will
continue to control the time base and the horizontal position will continue to
control which portion of the waveforms are displayed.
XY format is a dot-only display, although it can have persistence. The Vector
style selection has no effect when you select XY format.
You cannot display Math waveforms in XY format. They will disappear from
the display when you select XY.
NOTE
Use at higher room temperatures or with higher intensity display
formats, such as the white fields in the Hardcopy palette, can
temporarily degrade display quality.