Rice Lake CLS-420 Cargo Lift Scale Installation Manual - Manual (Page 57)

CLS-420 Installation Manual 47
8.7 Digital Filtering
The 420 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
8-3 shows the digital filter parameters on the CONFIG menu.




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Figure 8-3. Digital Filtering Parameters on the Configuration (CONFIG) Menu
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Figure 8-4. Flow Diagram for 420 Digital Filters
8.7.1 DIGFLx Parameters
The first three digital filtering parameters, DIGFL1, DIGFL2, and DIGFL3, 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
8-4).
The overall filtering effect can be expressed by adding the values assigned to the three filter stages:
DIGFL1 + DIGFL2 + DIGFL3
For example, if the filters are configured as DIGFL1=4, DIGFL2=8, DIGFL3=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.
8.7.2 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.