Display Modes
3–20
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
NOTE. Selecting either NTSC or PAL graticule automatically changes the
vertical scale, position settings, coupling, and sets to zero any vertical offset of
any channel displayed. These settings are not restored after switching to other
graticule types.
There are two display formats: YT and XY.
YT is the conventional oscilloscope display format. It shows a signal voltage (the
vertical axis) as it varies over time (the horizontal axis).
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 420A, TDS 460A, and TDS 510A
only)
Ch 4 (TDS 420A, TDS 460A, and TDS 510A
only)
If you press the WAVEFORM OFF button for an XY channel, the digitizing
oscilloscope deletes the XY graph of of the channels.
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 continues to
control the time base and the horizontal position continues 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 disappear from the
display when you select XY.
Select the Display Format
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