Measurement Computing DASYLab User Manual - Manual (Page 34)

DASYLab
© National Instruments Ireland Resources Limited | 3-5
glass on the toolbar of the display window to zoom in or out of the section
repeatedly. DASYLab displays a scroll bar below the zoomed section with
which you can move the section.
In the Chart Recorder you can inspect one curve or all curves for a certain
event. You describe an event with a level and the level duration. For example,
DASYLab searches for an event with a level that exceeds 5 volt for at least
10 seconds. If the event search is successful, a green diode lights up and
displays the value. DASYLab zooms the curve section with the peaks in the
display window. If you search during the measurement, DASYLab freezes
the display. Click the buttons in the dialog box to search for and to display
the next peaks. As soon as you close the dialog box for the event search, the
chart recorder displays the curve with the specified sampling rate, however,
still zoomed. Click Zoom In to restore the original display.
Y/t Chart
Use the Y/t chart to display fast data acquired in kilohertz as curves over time
in 2D axis systems. Unlike the chart recorder, the Y/t chart plots the curve
from left to right. Like the chart recorder, the Y/t chart can refresh the display
continuously or after a specified number of data blocks. Then the curves can
be viewed unchanged for some time on the screen. In the wiper display, the
Y/t chart plots the curves continuously with a vertical line and overwrites the
old curves when the wiper has reached the end of the axis system. The wiper
mode provides an overview over the development of the measurement
values.
You also can use the Y/t chart to display data channels as a 3D waterfall
display or as a 3D color sonogram. You enable and configure the 3D display
in the menu of the display window. If you enable the waterfall diagram, you
must select which connected data channel the Y/t chart is to display in 3D.
The waterfall display shows the last plotted curves for this data channel in a
cascaded display. The curve in the foreground shows the current data. The z-
axis reflects the data history that you can track with the measurement time or
the block number. Figure 3-2 shows the last ten results of a Fast Fourier
analysis with hidden-line calculation that deletes all hidden lines.