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Q. With the UDM meter, what is the action
of the digital filter parameters on the measure value?
The first filter parameter is Fil.S and defines
the operating range of the filter. This operating range is represented
as a yellow band in figure 1 (each small square is one digit). Until
the measured value (red curve in figure 1) is within this band, the
filter is active; as soon as the value is outside this band, the filter
is deactivated and a new band will be active around the new value.
The proceedure to set this parameter is to look at the size of the
fluctuation (in digits) and use this value (8 in figure 1 as an example).
The second parameter is Fil.C and represents the filtering coefficient.
The higher is Fil.C, the smoother is the curve of the displayed values
(black in figure 1). There is not a theoretical rule to define this
parameter, it is to be set on the field: however a rough suggestion
is to start with the same value of the Fil.S coefficient and then
increase it until the desired stability is reached.
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