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10.1.4.1.
Background ZPD Trend
Archives>ZPD Trend>Background ZPD
The graph in Figure 68 Is a daily average of the ZPD energy over 15 days. It is a trend for
the ‘Background,’ which occurs every 2 hours. The graph should be relatively flat because
the background gas (nitrogen) is consistent.
Between service intervals, the trend is usually toward a decreasing ZPD. A decreasing
ZPD energy is an upward trend on the graph because ZPD energy is a negative number.
Following a service, where the magnitude of the ZPD energy increases, or following an
upset condition, where the ZPD energy is reduced, you can expect a ‘step-change’ in the
trend.
10.1.4.2.
Sample point ZPD Trends
Archives>ZPD Trend>Sample ZPD
You can also trend the average daily value of the ZPD energy for any active sample point.
10.1.5. Download
Archives> Download
All user-exported data are listed for download. It may show progress while gathering data.
You can download the data to an external USB drive.
Figure 69. Download Exporting Data
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