User Manual Rev. E - Version 2.5 User guide

Scale Operations 59
5.0 Scale Operations
The following contains detailed operator instructions for Counterpart, including instructions on how to enter tare
weights, toggle between net and gross weight, enter unit weights, perform inventory accumulation and reduction,
and toggle between scales. All operator instructions are conducted with the scale in the operation mode that is the
weighing or normal mode.
Counting scale accuracy is determined by:
• Sample size (number of pieces)
• Total sample size as a percentage of full scale capacity
• Piece-to-piece weight variation
As a general rule when determining sample size of
fairly uniform pieces, the larger the sample size, the greater the
total sample weight, and therefore, the better the counting accuracy. Selecting the smallest capacity scale that can
obtain the highest counting resolution should be considered, but should not sacrifice the capacity required for the
heaviest container of parts. For this kind of application, a dual-platform scale may be the best selection. There is a
direct relationship between piece-to-piece weight variation (non-uniformity) and counting accuracy.
Therefore, elimination of the piece-to-piece we
ight variations ca
n be accomplished by:
1. Isolating the sample used to calculate the
unit weight and using the same sample to re-check the scale.
2. Recalculating the unit weight from lot-to-lot of parts. Parts
manufactured on one machine may vary
slightly from another machine relative to weight.
3. Tightening the manufacturing tolerances on the parts reduces piec
e weight variations and increases count
accuracy.
The Stand-by Screen
At the stand-by screen the
WEIGHT, UNIT WEIGHT, and QUANTITY displays show zeros and the annunciator for the
platform is illuminated (Scale 1 or 2).
5.1 Weight Unit Switching
The weight units displayed can be changed between primary, secondary and tertiary units during weighing
operations by pressing the
UNITS TOGGLE key.
5.2 Entering Tare Weights
Tare weights can be entered in the scale by one of two methods: one-touch tare or digital tare. Digital tare is used
when the tare weight is already known while one-touch tare is used when the tare weight is unknown. If you call up
an Item Code already programmed into the Counterpart memory and you have a tare weight stored for that Item
Code, the tare weight stored with the Item Code will override one entered digitally or by using the
TARE key.
5.2.1 One-Touch Tare, Tare Unknown
1. If the tare weight value is not known, place the item to be tared on the scale and press TARE . The weight
display should now show 0 and the Net annunciator should illuminate.
2. Remove the item from the scale. The weight display sh
ould show a negative weight value (weight of the
tared container, box, or item).
3. To clear the tare weight, press
TARE with no weight on the scale. The scale should be at gross zero. The Net
annunciator will no longer be illuminated.
5.2.2 Digital Tare, Tare Weight Known
1. If the tare weight value is known, use the numeric keypad to key in the value and then press TARE. The Net
annunciator will illuminate.
2. To reset the tare to zero, press
TARE again with no weight on the scale while the scale is at gross zero and
the Zero annunciator is lit.