User Manual - Version 2.2 Manual

52 Counterpart User Manual
5.0 Scale Operations
The following paragraphs contain detailed operator instructions for Counterpart. Included are instructions 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 primarily de
termined by the following factors:
• 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 si
ze of fairly uniform pieces, the larger the sample size the greater the
total sample weight, 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 can be accomplished by:
1. Isolating the sample used to calculate th
e unit weight and use 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 piece weight variations and increases count
accuracy.
The Stand-By Screen
At the stand-by screen the WEIGHT, UNIT WEIGHT, and QUANTITY displays show zeroes and the annunciator for the
platform you are using 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 container, box, or 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 container, box, or item from the scale. The
weight display should 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, 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 TA RE. 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 annunicator is lit
.