Digital Filtering - Rice Lake 482-AG Technical Manual

3.1.1

Digital Filtering

Digital filtering is used to create a stable scale reading in challenging environments. The 482-AG (firmware version 1.03 and
later) allows for the selection of adaptive filtering, rolling filtering or off for no filtering. The A/D sample rate must be selected
first. Then select the type of digital filter using the DIGFIL parameter.
CONFIG FORMAT
ADPFIL
AFSENS AFTHRH
LIGHT
000002
MEDIUM
HEAVY
Parameter Settings
AFSENS LIGHT Digital filter cutout sensitivity – the light setting responds quickly to small weight changes and is less stable; the heavy setting
MEDIUM
responds slowly to small weight changes and is more stable; use the heavy setting in an unstable environment
HEAVY
AFTHRH 000002 Digital filter cutout threshold – specifies the filter threshold, in weight value; when a weight change exceeds the value set for
threshold, digital filtering is suspended; a setting of 0 disables the filter; the decimal point in the entered value is assumed;
if the dd is 1 lb, a value of 1 is equal to 1 lb; if the dd is 0.1 lb, a value of 1 is equal to 0.1 lb
LOCK SEC The lock setting prevents the filter from resetting adaptive filtering; The threshold will not reset filtering until the specified lock
time is met
RFSTG1 2 Rolling filter stages – the number of A/D samples that are averaged in each stage; a higher number gives a more stable
4
RFSTG2 display by minimizing the effect of a few noisy readings, but slows down the settling rate of the indicator
8
RFSTG3 RFSTG1 Default - 16
16
RFSTG2 Default - 32
32
RFSTG3 Default - 32
64
1
RFSENS 8OUT Rolling filter cutout sensitivity – specifies the number of consecutive readings that must fall outside the rolling filter threshold
16OUT
(RFTHRH parameter) before digital filtering is suspended; if NONE is selected, the filter is always enabled
32OUT
64OUT
128OUT
2OUT
4OUT
RFTHRH NONE Rolling filter cutout threshold – specifies the rolling filter threshold, in display divisions; when a specified
2 dd
number of consecutive scale readings (RFSENS parameter) fall outside of this threshold, digital filtering is suspended;
5 dd
if NONE is selected, the filter is always enabled
10 dd
20 dd
50 dd
100 dd
200 dd
250 dd
CALIBR PROGRM PASWRD
ROLFIL
RFSTG1
LOCK
16
SEC
32
64
1
2
4
8
Figure 3-2. Adaptive Filter and Rolling Averaging Filter Sub-menu
Table 3-3. Adaptive Filter Parameters
TEST MENU
RFSTG2 RFSTG3
32 32
64 64
1 1
2 2
4 4
8 8
16 16
Description
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Configuration
RFSENS RFTHRH
16OUT 20 dd
32OUT 50 dd
64OUT 100 dd
200 dd
128OUT
2OUT 250 dd
4OUT NONE
2 dd
8OUT
5 dd
10 dd
19