24
At the start, the algorithm only considers the first measured sample, here called x
1
, and the
remaining 255 values in the buffer amounting to zero. Next, the algorithm reads measure x
2
and
uses x
2
and x
1
to calculate the Rms, considering the previous 254 corresponding to zero.
The algorithm will consider all the values prior to x
1
corresponding to zero until the x
255
value is
read (255
th
value), with the RMS value taking into account the previous 254 measured values.
When the algorithm reads the 256
th
measure (256 values in the buffer) and the measure is complete,
the algorithm will proceed as follows:
1. Reading of the sampled x
1
value transmitted by the acquisition device;
2. The square of the x
1
value is calculated and copied in the buffer position 256;
3. The RMS value will be reckoned by means of:
Please note that in the RMS
i-1
formula, the RMS value is prior to the –nth measure and T
k
is
the time constant.
4. The value is set in the buffer position 1;
5. Calculation continues starting from point 1.
To be noticed that the algorithm calculates the Rms instant value of the analysed event.
3.5.1.1 Time: display options
The text boxes and buttons below the scroll bar of each Graphics area showing time domain
measurements can be used to change display parameters. The table below provides the different
options and related explanation.
Through the Settings button, you can access the advanced settings to select the events to be
displayed or to apply filters to the acquisition measures.
To offset the displayed signals by the set up quantity
Advanced settings
To set up the diagram X axis scale
To set up the diagram Y axis scale
To highlight the colour of the analysed event
Time domain Graphics area display parameters
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