Horizontal Controls 2
Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide 67
To change the horizontal time mode (Normal, XY, or Roll)
1 Press [Horiz].
2 In the Horizontal Menu, press Time Mode; then, select:
• Normal — the normal viewing mode for the oscilloscope.
In the Normal time mode, signal events occurring before the trigger are
plotted to the left of the trigger point (▼) and signal events after the trigger
plotted to the right of the trigger point.
• XY — XY mode changes the display from a volts-versus-time display to a
volts-versus-volts display. The time base is turned off. Channel 1 amplitude
is plotted on the X-axis and Channel 2 amplitude is plotted on the Y-axis.
You can use XY mode to compare frequency and phase relationships
between two signals. XY mode can also be used with transducers to display
strain versus displacement, flow versus pressure, volts versus current, or
voltage versus frequency.
Use the cursors to make measurements on XY mode waveforms.
For more information about using XY mode for measurements, refer to “XY
Time Mode" on page 68.
• Roll — causes the waveform to move slowly across the screen from right to
left. It only operates on time base settings of 50 ms/div and slower. If the
current time base setting is faster than the 50 ms/div limit, it will be set to
50 ms/div when Roll mode is entered.
In Roll mode there is no trigger. The fixed reference point on the screen is the
right edge of the screen and refers to the current moment in time. Events
that have occurred are scrolled to the left of the reference point. Since there
is no trigger, no pre-trigger information is available.
Zooming into stopped acquisitions
The screen will still contain a relatively good display if you zoom-in horizontally by a factor of
1000 and zoom-in vertically by a factor of 10 to display the information from where it was
acquired. Remember that you can only make automatic measurements on displayed data.
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