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2638A
Users Manual
4-12
Table 4-4. Scan Statistics
Statistic Description
Maximum Maximum measurement.
Minimum Minimum measurement.
Average Average of all the measurements taken.
Standard Deviation
A measure of the distribution of a set of data from its mean. The more spread
apart the data, the higher the deviation.
Peak-to-Peak Difference between the Maximum and the Minimum.
Rate of Change A measure of how much the readings change over time.
To view the scan data:
1. Start a scan. See “Start a Scan” on page 4-10.
2. Push to open the Scan Data menu. After the menu opens, push to cycle the menu
pages to view more channels.
3. To view channel statistics, push .
Graph the Measurements
The Scan function has a graph feature that lets the user display the measurement data in a
graph. This feature is located in the Scan menu (push
then push ).The graph
automatically scales to fit all the information on the display when opened. To refine the
data, the graph can be manipulated with the front-panel arrow keys as shown in
Figure 4-5.
Notes
The maximum number of channels that can be graphed at once is four.
Selection of two or more channels with different input types (such as
temperature and milliamps) can make the graph difficult to read because
they do not share the same unit. To prevent this, only select channels of the
same input type or view the channels one at a time.
Selected
Channels
and Key
Time Stamps
Select or Deselect
Additional Setup Options
Graph Controls
(Front-Panel Keys)
Zoom Out
Zoom In
Move Right (in History Mode)
Move Left (in History Mode)
hcn056.eps
Figure 4-5. Graph Feature
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