Reference
Slow Horizonta
l Settings. At horizontal Scale settings of 40 ms/div or slower,
the oscilloscope may display waveforms in roll mode. As the rolling waveform
fills the screen, the waveform intensity and vector fill appears to decrease. The
oscilloscope automatically reduces the number of displayed points in order to
maintain a high acquisition rate: this does not represent a loss of acquired data.
When you stop the acquisition, the original waveform intensity and vector fill
returns to the display.
Using Zoom
and Delay Together. You can use both zoom and delay at the same
time to magnify a delayed acquisition.
Fast Time-B ase Settings. At the fastest time-base settings, only a portion of the
waveform shows in the display. The waveform record icon indicates that portion
with brackets. Push the zoom
button and then use the horizontal Position
control
to scroll through the entire waveform to see any portion you want. The
affected time-base settings are shown in the next table.
Acquisition resolution Affected time-base settings
Normal
100 ns/div to 1 ns/div
Fast Trigger
4ns/divto1ns/div
At th
e fastest time-base settings, the maximum zoom magnification factor is also
reduced.
Delay Interactions. The maximum delay setting is a function of the time-base
setting and acquisition resolution. If you set a large positive o r negative delay,
that amount of delay might be automatically reduced if you make t he following
ad
ditional control changes:
Change to a faster time-base setting
Change from Fast Trigger to Normal acquisition resolution
If the delay reduction occurs, it may cause the waveform horizontal position
to shift.
Negative Delay. You can select up to ten divisions of negative delay. At the fastest
time base settings, you can use negative delay to see more of the waveform that
occurs before the trigger point.
Roll Mode Display. To obtain a rolling display similar to a strip-chart recorder,
turn off zoom and delay, select the Auto trigger mode, and set the horizontal Scale
control to 40 ms/div or slower. Subsequent changes to the horizontal Scale cause
the roll-mode display to erase and restart.
TDS3000C Series Oscilloscope User Manual 71
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