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Scale Operations

5.4

Entering Unit Weights

Entering unit weights can be done either by sampling, as presented in Section 5.4.1, or by key entry as described

in Section 5.4.2.

Note:

SPEC 03 EXTENT OF INSUFFICIENT SAMPLES controls unit weight sampling. The default setting for the SPEC is 0.1

percent.

Note:

SPEC 63 SAMPLE QUANTITY determines the number of peices the scale assumes are on the platter when you press the

PIECES key to calculate the unit weight. The default setting for the SPEC is 0: 10 pieces.

Note:

SPEC 64 SCALE A <–> B sets whether the unit weight determined by sampling is automatically transferred from Scale A

to Scale B. The default setting for the SPEC is 0: MANUAL.

When you have a procedure that involves sampling an item’s unit weight on the DC-100’s built-in platform and then want to go
immediately to weighing and counting boxes or bins on a floor scale or other external scale, set SPEC 64 to 1: AUTO. If the
external Scale B is not necessarily going to be used for weighing the same item as is being sampled on Scale A, set SPEC 64 to
0: MANUAL.

Note:

SPEC 65 UNIT OF PCS WT controls whether the unit weight is displayed per 1000 pieces or per 1 piece. The default

settings for this SPEC is 0: 1000 pieces.

Unit Weight per 1000 Pieces vs. Unit Weight per 1 Piece

The scale’s internal microprocessor calculates unit weights to 7 or 8 decimal places. However, the scale display

generally can only show Unit Weight to 5 characters. If this Unit Weight is recorded from the scale display and

entered by key entry, this can introduce errors in the Unit Weight and consequently in the counts. This error

increases as the Unit Weight of the parts being counted decreases.
Example: A sample of 10 zener diodes is placed on the scale. The Unit Weight is computed to be 0.0006536 lbs.

However, the scale has a 5 character display for Unit Weight so the scale can only display .0065 as the Unit

Weight. If this Unit Weight were recorded and keyboard entered in future counting operations, the resulting error

would be: 00065 .55%
.0006536
On the other hand, with entry of the Unit Weight as “weight per 1000 pieces” the decimal place is, in effect,

moved three places to the right, allowing 3 more decimal places of accuracy. In this example, the entry would be

made as 0.6536 per 1000 pieces, eliminating the error.
As a practical note, entering unit weights per 1000 pieces also lessens the chances of entering the wrong number

of zeros when keying in weights with many leading zeros. Misentry of unit weights is a common cause of

inaccurate counting.
When might you want to use unit weight per 1 piece? Generally in one of two cases:

1. If you are working with other existing systems or procedures that are already set up to record unit weight

per piece (inventory systems, labeling requirements, etc).

2. If the unit weight or your pieces is more than 100 lbs, the number of digits in the scale’s Quantity display

will not be able to fully display counts of omore than 100 pieces.

5.4.1

Unit Weight Operation by Sampling

Unit weight operation by sampling is accomplished by placing a 10 piece sample on the scale and then pressing

the

PIECES

key. The scale calculates a unit weight based on the capacity of the scale compared to the weight of