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sampling, if the operator will be counting similar parts. Fixed(one key)
sampling simplifies and speeds up the counting procedure. Select t(rue) to
enable variable sampling if parts of widely varying weight are counted and the
operator has sufficient skills to decide on the correct sample size. The Fixed
Sample Quantity parameter is used to set the fixed sample size.
9. Fixed Sample Quantit
y - Selects the quantity of parts used for single
keystroke counting(sampling by pushing the COUNT key only). Be sure to use as
large a number as possible for maximum accuracy. The sample size should be
large enough to provide at least 0.4% full scale loading with the smallest size
part to be counted. The XC780 must be in weight mode to use single key, fixed
sample counting.
10. Sample Enhancement
- Sample enhancement is used to automatically correct
for inconsistent piece weights. The feature can be set to automatically re-
compute the APW for every three pieces that are added. That means the APW is
calculated to the full 1,000,000 internal count resolution of the XC780. This
yields more accurate sample APWs and therefor more accurate final piece counts.
To use sample enhancement:
Step 1: Set the "EnhAnC F" parameter to "EnhAnC t".
Step 2: Count the part(See piece count operation)
Step 3: Add parts one at a time. Every three pieces the APW will update.
Keep adding until the required accuracy is achieved. Use the Sample Guide
(SHIFT/F1) to display the percent accuracy.
If while using sample enhancement,the count shows inaccurate, remove parts till
the display is accurate and press the COUNT key to update the APW.
The sample enhancement feature can be manually activated at any time while
counting by pushing the COUNT key.
11. Accumulation
- The accumulation features are used to record the total
quantity of each part being counted. In the Auto-accumulate mode, the XC780
will automatically accumulate as soon as the count stabilizes. The scale will
not accumulate again until the weight is returned near zero. In the Manual-
accumulate mode, the displayed quantity is added to the accumulated quantity
when the SHIFT/+ACCUM key is pressed. SHIFT/-ACCUM subtracts from the
accumulator. Use Manual accumulation for most situations, although auto-accum
can be a great time saver when used.
12. Setpoint Output Mode
- Selects which setpoint mode is used.
OFF disables setpoint operation. The setpoints will always be in their de-
activated state as defined by the "SPA" parameter.
COMP selects comparator operation. This mode is used for check weighing or any
operation requiring OVER/UNDER/GO indication. The UNDER output is actuated
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