5.5 Noise level and histogram; defining parameters of the analysis

 

The graph in the Noise panel on the Analysis folder shows the noise Histogram of the currently displayed transient. For the calculation a parabolic fit of the last part of the transient is compared point by point with the actual transient and the deviation histogram displayed. It is possible to set how much of the patter part of the transient is sampled in this way by using the scroll bar above the histogram. Two spin buttons above the histogram allow its span (in standard deviation units) to be modified, and the number of histogram increments in which this span has to be displayed. General settings for this graph can be modified by clicking the right mouse button when the mouse pointer is on the graph as described in the Graphic Server section. The histogram redraws automatically when the Main graph is redrawn. Alternatively, one can force the histogram to redraw by pressing the corresponding button on the main toolbar. The histogram can be overlaid with the fitted Gaussian distribution of the amplitudes in order to allow a user to judge whether the noise in the given transient has the amplitude distribution close to the Gaussian one. The Gaussian distribution is fitted and shown provided this action is enabled on the Customise form.