Viewing graphs of data

The home page of webDAQ/100 has two links on the right half of the page for viewing or downloading your data - one for text reports and one for graphs. If you click on the words Click here to view graph, a new browser window appears and draws one or more graphs showing the data in the report format and time interval you have selected (selections are made just above the graph link on the home page).

When the graph page appears, your browser first begins by downloading the data just as it would for the text view. The download speed is the same, and depends on the formats chosen, the speed of your network, and the speed of your browser and your computer. You may see a status display in your browser of progress as lines of report data are loaded. Once the data has been read in, the graph(s) will appear on the screen.

This graph page automatically selects how many graphs to draw, to keep the number of traces per graph to a maximum of 4 or 5. Channels are assigned in the order they appear in the report. If you want more control over the graph formats, trace assignments, axis scaling, colors, and so forth, the graphs can be customized

What the graph view does:

  • Draw a graph of one of the predefined report formats and time intervals of available data.
  • Provide control over scaling, colors, graph size, fonts (if you create a custom graph page).

    • What the graph view does NOT do:

  • It does not provide an updating strip-chart view.
  • It does not handle multirate data very well - generally if you are sampling channels at different rates, you should define separate report formats for each rate group of channels.
  • It does not provide analysis, cursors, zoom, or annotation features. If you need very sophisticated graphing and data analysis, you should download the data to your computer and use a program such as Excel, Matlab, TestPoint, or others.