482-AG Livestock Digital Weight Indicator
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Adaptive Filter
The adaptive filter (
ADPFIL
) has two settings, sensitivity and threshold The adaptive filter maintains a running average of the
A/D readings when the weight change remains less than the defined threshold value. The filter automatically applies less value
to each successive A/D reading the longer the weight change is less than the threshold value. The amount of value given to the
most recent A/D reading is determined by the sensitivity setting.
Adaptive Filter Sensitivity
(
AFSENS
)
The adaptive filter sensitivity can be set to heavy, medium or light. A heavy setting will result in an output that is more stable to
weight changes, than that of light. However, small changes in weight data (a few grads) on the scale base will not be seen as
quickly.
If the difference in typical subsequent weight values on the scale will only be a few grads, use a light setting. On a scale where
the changes in subsequent weight values will be hundreds of grads, a heavy setting is be more appropriate. When the weight
has not exceeded the adaptive filter threshold setting, the effective response is approximately 30 A/D cycles for a light setting,
90 A/D cycles for a medium setting and 180 A/D cycles for a heavy setting.
Adaptive Filter Threshold (
AFTHRH
)
The adaptive filter threshold should be set for the amount of observed instability in the system. This parameter can be set in the
range of 0 to 99999 and is entered as a weight value. When a new sampled weight value is acquired, the adaptive filter
compares the new value to the previous (filtered) output value.
If the difference between the new value and the previous output value is greater than the adaptive filter threshold, the adaptive
filter is reset to the new weight value.
If the difference between the new value and the previous output value is less than the adaptive filter threshold, the two values
are averaged together using a weighted average. The weighted average is based on the amount of time the system has been
stable, and the selected adaptive filter sensitivity.
With the adaptive filter threshold set at zero, determine the amount of instability that is present. Enter this amount of weight
instability to set the threshold of the adaptive filter. The adaptive filter is set to OFF when the adaptive filter threshold parameter
is set to zero.
Rolling Averaging Filter
The Rolling Averaging Filter (ROLFIL) uses mathematical averaging with three stages. These configurable stages control the
effect of a single A/D reading on the displayed weight. When an A/D reading is encountered that is outside a predetermined
band, the rolling averaging filter is overridden, and the display jumps directly to the new value.
Filter Stages (
RFSTG1-3
)
The filter stages can each be set to a value of 1 to 64. The value assigned to each stage sets the number of readings received
from the preceding filter stage before averaging. Setting the filter stages to 1 effectively disables the rolling filter.
A rolling average passes through three filtering stages. Those filtering stages are a weighted average of the product and have
assigned values of (
RFSTG1
x
RFSTG2
x
RFSTG3
). That end value falls within a time frame corresponding to the sum of the
values (
RFSTG1
+
RFSTG2
+
RFSTG3
).
Example: if RFSTG1=5, RFSTG2=2, RFSTG3=15, then the rolling average = 6.82.
(5 x 2 x 15 = 150) divided by (5 + 2 + 15 = 22) = 6.82
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