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Chapter 7
Trends
Overview
During operation, the Windows based PC-SAM software continuously logs data to a
trend file located in a project folder. The data sample rate is once per second and more
than 70 items are included in the recorded data point. The items include measured
values of physiological functions (e.g. heart rate, temperature, etc) as well as status
indicators of the hardware (e.g. battery voltage, offset voltage, etc.) The data file name
and location is defined in the setup menu (refer to Chapter 3). The user has the option
to save or discard the data when exiting the program.
To view data previously collected, execute the TrendMap program from the desktop.
This program allows all or a subset of the data to be organized and output in a user
defined format for import into a spread sheet program.
Provision exists to allow the user to configure the way the data is organized and viewed.
Each new configuration can be saved as a setup file with the data set for recall at a later
date.
Events logged in PC-sam are recorded in the trend file as item 64 and can be viewed
with TrendMap. Also AUX IN and Fiber Optic AUX IN are recorded in item 66.
TrendMap Viewer display
The TrendMap Viewer display is shown on the next page. More than 70 values are
included in each TrendMap data set. A time cursor is displayed near the bottom and an
item cursor is displayed on the right side of the display. Individual values are displayed
on the left for the time point selected.
A subset of the trend data set is selected by the user for export. The exported data set
is bound by a start and stop time and includes all trends up to one selected as the last
to output. Commands exist to allow trend reordering before data is exported.
Revision C, August 2013
7-1
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