CAS LP-2G, Service Manual

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9 Digital Filtering
33
NUMERIC
< CAL: DIGITAL FILTERING >
Motion Band : [ 3] COUNTS
Filter Band : [10] COUNTS
Filter Sample Times : [ 8]
9 Digital Filtering
9.1 Digital Filter Settings
Once at the CAL Main
menu screen, turn CAL switch on
and press the 3 key. The Digital
Filtering screen will appear as
follows:
Motion Band: This value is used to
set the scales stability lamp. It
can be from 0 to 50 but should never be less than 3. When the scale weight is stable, the stable symbol
Î
is on; when the scale is unstable the stable symbol is off. Higher value makes the weighing more
stable but slower.
•
Stable to Unstable: If there are 2 consecutive load cell readings whose difference is greater than
the Motion Band, then the stable lamp is shut off.
•
Unstable to Stable: If there are 4 consecutive load cell readings whose difference between any
pair is less than or equal to the Motion Band, then the stable lamp is turned on.
Filter Band: This value is used to filter out small vibrations from noisy environments. It can be from 0 to 50
but should not be less than 10. The filter will also affect stability: the more filtering the more stable the
scale appears. Higher values will filter out more noise but will slow the weight response time.
•
Filter: If there are Filter Sample Times number of consecutive load cell readings whose difference
is greater than the Filter Band, then they are not filtered; if they are less than or equal to the Filter
Band, then they are averaged together.
Filter Sample Times: This value controls the number of readings that the Filter Band uses. It can be from
0 to 16 but should not be less than 8. Higher values will smooth out sharp weight changes due to noise.