GDS-800 Series Digital Storage Oscilloscope Operation Manual
24
Figure 5-7: Operating the XY display function
These 500 points processed by the oscilloscope under run mode are characteristic
points of real acquired long memory waveform. Due to the hardware limitation of
LCD panel, always 250 points (300 points for side menu off) will be displayed. The
way to explore the real acquired waveform on the oscilloscope’s long memory is
stopping the scope and change the time base. When the scope is stopped, users
can observe any portion or all the waveform memory record by changing the time
base or horizontal trigger position. Decreasing time base expands the waveform and
is referred to as “zooming in”. This feature performs the similar function to the time
base windowing feature. But this feature is available under the real-time acquisition
mode and is only operable when acquisition is stopped.
Users can shift the stopped waveform horizontally on the LCD screen. It is controlled
by the horizontal’s POSITION knob. Increasing “delay trigger indicator” shifts the
waveform to the left and decreasing “delay trigger indicator” shifts the waveform to
the right. By observing the memory bar and viewable area, user can see what
portion of the memory is being displayed.
The memory length is also an important factor because the following formula.
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