Averaging

The signals from the quadEM devices are averaged at a number of places in the device and processing pipeline.

Description	Record
Averaging in the device. This is device-dependent.	ValuesPerRead is used on the TetrAMM. The TetrAMM sampling frequency is 100 kHz and the minimum value of ValuesPerRead is 5, resulting in a maximum sampling rate of 20 kHz at the quadEM driver.
Primary averaging in quadEM driver. The NDPlugStats plugins are used to average the signals for this averaging, providing additional statistics such as sigma, skewness, and kurtosis.	AveragingTime
Secondary averaging in quadEM driver. The asynFloat64Average device support is used to do this. It provides only the mean. This can be used for feedback, for example, and can operate at a different averaging time than the primary averaging which might be used for data collection.	FastAveragingTime
Averaging in the time-series plugin. The time-series plugin is passed data at the rate at which it arrives from the device. It can do averaging on the time-series data. This can be used to improve the signal/noise at the expense of bandwidth upstream of the FFT plugin.	TS:TSAveragingTime
Averaging in the FFT plugin. The FFT plugin receives data each time the time-series plugin receives the requested number of samples. The resulting FFTs can be averaged to improve their signal to noise.	FFT:[signal]:FFTNumAverage