3-2
IM DL850E-01EN
How the Time Axis Relates to the Display of the Waveform
There are 10 div along the time axis, and 1001 points (logical number of points, not the dots on the screen) are
used to draw the waveforms. Therefore, if the display record length is exactly 1 kpoint (the number of acquired
data points is 1001), the waveform is displayed using 1001 points. However, if the display record length is
greater than or equal to 2 kpoint, as shown in the figure on the right, the DL850E/DL850EV draws the waveform
by determining the maximum and minimum values at each fixed interval (P-P compression) and aligning them
vertically at the same time position (total number of points: 2002).
1001 points
*
0
1000
Sampled data
Time axis
Record length
<P-P compression display>
Maximum value
Minimum value
* 1001 is the logical number of
points. On the screen, the data
is compressed to 800 or 500
dots (1000 dots in the
full-screen waveform display).
Vertical axis
Zooming Horizontally and Drawing Waveforms
The DL850E/DL850EV can expand (zoom) the waveform horizontally. When the zoom factor of the waveform
is increased, the number of displayed points decreases. The DL850E/DL850EV displays the waveform using
P-P compressed until the number of displayed points falls to 2002, but it cannot display the waveform using
continuous lines when the number of displayed points falls below 1001. When this happens, the DL850E/
DL850EV
data so that the number of displayed points is 1001.
Dot Display
Under the initial settings, display interpolation is performed automatically, but you can also disable display
interpolation (set it to OFF) and display the waveform using dots. When interpolation is disabled, up to 2002
points or 100100 points (whichever is selected) of all the acquired data are displayed without P-P compression.
For example, if the number of displayed points is set to 100 kpoint and the display record length is 10 kpoint (the
number of acquired data points is 10010 points), the DL850E/DL850EV draws all the points of the waveform by
aligning 10 points vertically at the same time axis position. If the number of acquired data points exceeds 2002
or 100100, to display the waveform, the DL850E/DL850EV reduces the amount of data to 2002 or 100100 points
(whichever is selected) by removing the data between displayed points.
Relationship between the Time Axis Setting, Record Length, and Sample Rate
If you change the time axis setting, the sample rate and the acquisition-memory record length also change. For
details, see appendix 1, “Relationship between the Time Axis Setting, Record Length, and Sample Rate” in the
Getting Started Guide
, IM DL850E-03EN.
3 Horizontal Axis