AEKI2c.TXT 0 8 128 1 AEKI2cdsp.TXT
calculation of the voltage PSD, current PSD, and Zn of a time record
divided in 1 or several sections
file_in hanning (0 = no, 1 = yes) nb_section nbpoint_section
detrend (0 = no, 1 = linear) file_out
no character "blank" in the names of file_in and file_out
nbpoint_section must be a power of 2
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When detrend = 1, information is given in the final window on the
importance of the drift in the voltage and current time records:
- SD is the standard deviation of the detrended signal
(SD is wrong if calculated on the raw signal because of the
influence of the drift),
- aT is the signal drift over the duration T of the time record
(a is the slope of the linear drift),
- drift/Vpp (or drift/App) is the ratio aT/(4 SD): 4 SD represents
the peak-to-peak amplitude of the fluctuation (indeed, the
probability that the amplitude of a Gaussian signal with mean 0
ranges between -2 SD and +2 SD is 95.4 %, which is close to 100 %).
This ratio compares the signal drift and the amplitude of the
fluctuations. It only indicates if the drift was important in the
raw data (roughly, the drift is important when the ratio is higher
than 0.1). It brings no information on the linearity of the drift
that must be checked by looking at the time record.