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With the Zoom Window you can expand and examine a small section of LabChart
data in detail. To view data from a single channel, drag to select the
area of interest in the LabChart window (drag in the Time axis to select
multiple channels), then choose the Zoom Window item from LabChart’s
Windows menu or click the Zoom Window button in the Tool Bar.
Measurements are made easily from the displayed data using the Waveform
Cursor and the Marker. The number buttons at the bottom left corner of
the window determine which Channel’s waveform is tracked when several
channels of data are displayed. The time (t) and amplitude (Y) readings
at the tracking point are reported at the top of the window. A practical
example would be measuring an R-R interval from an ECG recording (see
Figure 1) and then calculating instantaneous heart rate. The same data
selection can be calculated by the Data Pad, and the results for heart
rate compared. Students should be encouraged to make manual measurements
from their data before using the Data Pad.
The contents of the Zoom Window can be copied and printed allowing data
to be easily incorporated into lab reports.
For further information about the Zoom Window, refer to Chapter 4 of
the LabChart User's Guide.
To download an animation illustrating the Zoom Window features click
here (Flash movie 1 MB).
 Figure 1. The Zoom window showing a section of an ECG
recording. |