The Average I/O averages successive measurements and outputs the average of these measurements. The Average I/O object can work in two different modes: Running average (default) and average-of-n.
Averaging is useful in situations when the signal of interest is periodic and (random) noise is present on top of it. By taking multiple measurements of the signal and averaging them, the signal to noise ratio will increase.
To control the behavior of the Average I/O, several properties are available. These can be accessed through a popup menu which is shown when the I/O is right clicked.
The Average count property determines how many measurements are averaged. Several standard values are available, as well as a user defined setting.
When the property Running average is switched on, the Average I/O will continuously replace a part of its memory by the newly arriving measurement, effectively "forgetting" the oldest measurement. When switched off, the Average I/O operates in average-of-n mode. The average will then automatically be cleared after n measurements.
When the Stop after count option is checked, the Average I/O will stop collecting data when Averaging count measurements have been collected.
When Only expand is set, the data size of the Average I/O gets higher when the source's data size grows, but does not shrink when the source's data does. This can be useful when averaging data of a source with varying data size.
The Average I/O can be manually cleared with the Clear action. The internal average count is reset when the Clear action is executed.