682 Synergy Plus
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16.7.1 Digital Rolling Average Filter (Average Only)
The digital rolling average filter 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 outside of a predetermined band is encountered, the digital
rolling average filter is overridden and the display jumps directly to the new value.
Digital Filter Stages 1-3
The filter stages can each be set to a value of 1–256. 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 is passed to successive filtering stages for an overall filtering effect which is effectively a weighted average of
the product of the values assigned to the filter stages (
Digital Filter Stage 1 x Digital Filter Stage 2 x Digital Filter Stage 3
) within
a time frame corresponding to the sum of the values (
Digital Filter Stage 1 + Digital Filter Stage 2 + Digital Filter Stage 3
).
Digital Filter Sensitivity and Digital Filter Threshold
The rolling averaging filter can be used by itself to eliminate vibration effects, but heavy filtering also increases settling time.
The
Digital Filter Sensitivity
and
Digital Filter Threshold
parameters can be used to temporarily override filter averaging and
improve settling time.
•
Digital Filter Sensitivity
specifies the number of consecutive A/D readings which must fall outside the
Digital Filter
Threshold
before filtering is suspended
•
Digital Filter Threshold
sets a threshold value, in display divisions; When the specified number of consecutive A/D
readings (
Digital Filter Sensitivity
) fall outside of this threshold, filtering is suspended; Set
Digital Filter Threshold
to
NONE
to turn off the filter override
Digital Rolling Average Filter Procedure
1. In
Setup
mode, set the rolling filter stage parameters (
Digital Filter Stage 1-3
) to 1.
2. Set
Digital Filter Threshold
to
NONE
.
3. Return to
Weigh
mode.
4. Remove all weight from scale, then watch the indicator to determine the magnitude of vibration effects on the scale.
5. Record weight below which all but a few readings fall. This value is used to calculate the
Digital Filter Threshold
parameter in
.
Example – if a heavy-capacity scale (10,000 x 5 lb) produces vibration-related readings of up to 50 lb, with occasional
spikes up to 75 lb, record 50 as the threshold weight value.
6. Place the indicator in
Setup
mode and set the filter stage parameters (
Digital Filter Stage 1-3
) to eliminate the vibration
effects on the scale (leave
Digital Filter Threshold
set to
NONE
).
7. Find the lowest effect value for the
Digital Filter Stage 1-3
parameters.
NOTE: If needed, the digital filter cutout sensitivity (
Digital Filter Sensitivity
) and the digital filter cutout threshold (
Digital
Filter Threshold
) can be used to reset the digital rolling average filter so the response to a rate change is faster.
8. Calculate the
Digital Filter Threshold
parameter value by converting the weight value recorded in
divisions (
Threshold_Weight_Value / Display_Divisions
).
, with a threshold value of 50, and a display-division value of 5, set the Digital Filter Threshold
parameter to 10 display divisions.
9. Set the
Digital Filter Sensitivity
parameter high enough to ignore transient peaks. Longer transients (typically caused
by lower vibration frequencies) cause more consecutive out-of-band readings; set the
Digital Filter Sensitivity
parameter higher to counter low frequency transients.
Summary of Contents for REVOLUTION 682 Synergy Plus
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