Gentec-EO T-Rad-USB (LEMO) - Manual (Page 18)

T-RAD-LEMO-USB Instruction Manual Version 2.0 June 2012 18
Standard Deviation
The standard deviation of the data set. This can be interpreted as the RMS noise.
Standard Deviation and Variance Details:
The VI calculates the output values using the following equations.
n - 1
µ = SUM [ Xi / n ]
i = 0
where N is mean and n is the number of elements in X.
standard deviation = Q^2
n - 1
Q^2 = SUM [ ( Xi - N)^2 /( n - 1) ]
i = 0
where Q is variance, N is mean.
Filter Bandwidth
The filter bandwidth that results from the selected filter Tau.
Data File
The path of the currently open data file. If the indicator is empty, no file is currently open to log
data.
7.3 The Tuning Needles Display
The Tuning Needles Display is visible to the user when its tab is selected. It contains Controls
and Indicators for the Tuning Needles.