LC1 – USB / USB 2.0 CCD Line Camera / page 22
3.3.3.
Current Layer
The layer that is displayed at the top of the plot window is considered to be the current layer.
Whatever functions are called act upon this layer. If snap cursors, vertical cursors, or
horizontal cursors are displayed, they show up on this layer. The area to the right of the layer
name and attributes shows the mathematical function that is operating on the layer. At the far
right is a mouse control that allows for interactively controlling the values within the math
function. This is used as follows:
Highlight the numeric part of the mathematical expression that will be altered.
Move the mouse over the
button.
While holding down the right mouse button, move the mouse forward to increase the value,
and backward to decrease the value.
Note:
When decreasing values in this manner, it is very easy to decrease the value to zero.
This can cause errors such as division by zero that will stop the polling of the line
camera.
3.3.4.
Averaging & Smoothing
3.3.4.1.
Averaging
The averaging routine uses the SPA (
Samples Per Average
)
function. This function is accessible through the main toolbar. Averaging works on
Layer0 as a rolling average and the number in the SPA function represents the
number of complete data sets averaged. When a source is noisy or fluctuating, the
SPA function can act to provide a stable output.
3.3.4.2.
Smoothing
Smoothing uses a mathematical algorithm to attempt to remove noise. Unlike the
averaging function, smoothing is done on an existing layer and presented in another
layer (
i.e. Layer1 can display Layer0 smoothed
). Layer0 can never display another
layer smoothed because it always represents the raw data.
