Agilent Technologies DP235 Guia do Utilizador descarregar pdf (Página 115)

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Contents ▲ 115 ▼ Index

Filtering Setpoints

The first step the software takes in analyzing the raw data is to apply data filtering. The

following filtering setpoints can be changed:

Peak Find Setpoints

After data filtering, the peak find algorithm locates the peaks and calculates the local

peak baselines. The algorithm begins by finding all the peaks above the noise threshold

in order to determine the baseline, after which any peaks below the noise threshold are

rejected. A local baseline is calculated for each peak to allow for baseline drift.

Filter Width Defines the data window, given in seconds, used for averaging. The

broader the filter width, the more raw data points are used for

averaging. As a result, the noise level will decrease, but peaks will

become lower and broader. Overall, changing the Filter Width has

more effect on the result of the filtering procedure applied then

does changing the Polynomial Order.

Polynomial Order This setting is used to define the power series applied to fit the raw

data. The higher the number, the more the fit function will follow

the noisy raw data curve. As a result, the noise level of the filtered

curve will increase.

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