Test controller, histogram page
This page shows one or more histograms of the logged/table values. It is possible to select number of bins.
What is on the screen
What is on the screen
In the above picture I have labelled the different areas of this page, in the following I will go more into details about each area.
The histogram shows the distribution of values, either as a count for each bar or as a percent of total data for each bar. The data used can be the full amount of data or a range of data.
It is possible to show one, two or three histograms at a time.
The scale at the bottom of the histograms is defined on the "Scales for chart" and is the same as is used for a chart.
The range fields are used to limit the data used for the histogram, they list the first and the last sample to include. This can be selected on the chart page and copied to this page, but can also be entered manually.
There are a few options when entering values manually:
When using the - prefix in the first sample the histogram will "roll" when data is updated, i.e. it is possible to view the last x samples all the time.
- h:m:s format
- time in seconds
- time in minutes (use a m postfix)
- time in hours (use a h postfix)
- Sample number (use a # prefix)
- From end of data (Use a - prefix, i.e. enter time or samples as negative value).
- Specify number of samples, instead of last sample (Use a w prefix).
Select between count and percent scale, the actual count and percent will often be smaller when a high amount of bins are used.
This defines how many bars the bars the histograms is using, it can be from 5 to 1000 bins. It is best to keep the number of bins below the actual resolution.
Above is a very low resolution and a high resolution histogram.
It is possible to save the shown histograms as a png file. All shown histograms is saved as one png file. The screen resolution and save resolution is not related.
When pressing "Save" a save dialog will be shown where it is possible to select resolution of the saved png file.
The available resolutions are defined on the configuration page.
Measured values from all devices are listed here and it is possible to select what values to show as curves. Digital channels will not be included.