Rice Lake Counterpart Configurable Counting Indicator - User Manual Rev. E - Version 2.5 - Manual (Page 100)

94 Counterpart Counting Scale Indicator
9.6 Digital Filtering
The Counterpart uses averaged digital filtering to reduce the effect of vibration on weight readings. Adjustable
threshold and sensitivity functions allow quick settling by suspending filter averaging, allowing the weight reading
to jump to the new value. Figure 9-2 shows the digital filter parameters on the CONFIG menu.
DFLTR1 DFLTR2 DFLTR3 DFSENS DFTHRH
64
128
4
16
8
32
256
1
2
32OUT
64OUT
2OUT
8OUT
4OUT
16OUT
128OUT
20D
50D
250D
5D
2D
10D
100D
NONE
200D
64
128
4
16
8
32
256
1
2
64
128
4
16
8
32
256
1
2
Figure 9-2. Digital Filtering Parameters on the Configuration (CONFIG) Menu
DIGFL1= n1 DIGFL2= n2 DIGFL3= n3
n1
A/D Readings
n2
1st Stage
Filter Averages
n3
2nd Stage
Filter Averages
1st Stage
Filter Averages
2nd Stage
Filter Averages
3rd Stage
Filter Averages
Displayed
Value
Figure 9-3. Flow Diagram for Counterpart Digital Filters
9.6.1 DIGFLx Parameters
The first three digital filtering parameters, DFLTR1, DFLTRL2, and DFLTR3, are configurable filter stages that
control the effect of a single A/D reading on the displayed weight. The value assigned to each parameter sets the
number of readings received from the preceding filter stage before averaging (see Figure 9-3).
The overall filtering effect can be expressed by adding the values assigned to the three filter stages:
DFLTR1 + DFLTR2 + DFLTR3
For example, if the filters are configured as DFLTR1=4, DFLTR2=8, DFLTR3=8, the overall filtering effect is 20
(4 + 8 + 8). With this configuration, each A/D reading has a 1-in-20 effect on the displayed weight value. Setting
the filters to 1 effectively disables digital filtering.
9.6.2 DFSENS and DFTHRH Parameters
The three digital filters can be used by themselves to eliminate vibration effects, but heavy filtering also increases
settling time. The DFSENS (digital filter sensitivity) and DFTHRH (digital filter threshold) parameters can be used
to temporarily override filter averaging and improve settling time:
• DFSENS specifies the number of consecutive scale readings that must fall outside the filter threshold
(DFTHRH) before digital filtering is suspended.
• DFTHRH sets a threshold value, in display divisions. When a specified number of consecutive scale
readings (DFSENS) fall outside of this threshold, digital filtering is suspended. Set DFTHRH to NONE to
turn off the filter override.