78
UM25001C
4 10 Digital Filter4 10 Digital Filter
In certain application the process value is too unstable to be read. To improve
this a programmable low pass filter incorporated in the BTC-2500 can be used.
This is a first order filter with time constant specified by parameter which
is contained in setup menu. The default value of FILT is 0.5 sec. before
shipping. Adjust FILT to change the time constant from 0 to 60 seconds. 0
second represents no filter is applied to the input signal. The filter is
characterized by the following diagram.
FILT
In certain application the process value is too unstable to be read. To improve
this
a programmable low pass filter incorporated in the BTC-2500 can be used.
This
is a first order filter with time constant specified by parameter which
is
contained in setup menu. The default value of FILT is 0.5 sec. before
shipping.
Adjust FILT to change the time constant from 0 to 60 seconds. 0
second
represents no filter is applied to the input signal. The filter is
characterized
by the
following diagram.
FILT
Menu
FILT
Filter is used to stabilize the
process display.
Filter is used to stabilize the
process
display.
Time
PV1
1 sec1 sec
1 sec1 sec
FILT=30
FILT=0
FILT=1
Figure 4.7
Filter Characteristics
Figure 4.7
Filter
Characteristics
The Filter is available only for PV1, and is performed for the displayed value
only. The controller is designed to use unfiltered signal for control even if Filter
is applied. A lagged ( filtered ) signal, if used for control, may produce an
unstable process.
The Filter is available only for PV1, and is performed for the displayed value
only.
The controller is designed to use unfiltered signal for control even if Filter
is
applied. A lagged ( filtered ) signal, if used for control, may produce an
unstable
process.
Note
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