Rice Lake Counting Scales - IQ6500 Installation and Operation Manual - Manual (Page 13)

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4.0 Operating Instructions
This section provides detailed instructions for operating your IQ6200/6500. Basic to all counting procedures
is the requirement to establish the average unit weight of the parts to be counted. Typically this is done by
taking a representative sample quantity of the parts, determining the total weight of that sample, and then
obtaining the average unit weight by computation. The IQ6200/6500 does this all in one step. The IQ6200/
6500 permits determination of average part weight to a very precise value by combining the following com-
putational functions:
• Insufficient sample level protection
• Selectable accuracy enhancement by recomputation
4.1 Determining a Unit Weight
To determine a unit weight:
1. From net weighing mode, put a sample number of pieces, 10 or more, on platform. If the pieces being
counted are small, count out the sample in your hand, then place all of the sample pieces on the scale
at the same time.
2. If you used a sample of 10, press PIECES (this key defaults to 10). If you used a sample number
other than 10, key-in number of sample pieces with numeric keys, then press PIECES. The unit
weight per 1000 pieces is displayed on Unit Weight display.
4.1.1 Insufficient Sample
When sample pieces are put on the platform and the number of pieces is not sufficient, the Insuff lamp is lit.
The Add line, followed by the number of pieces to add, appears in the Weight display when PIECES is
pressed. This means that the weight of the sample is insufficient for the scale to make an accurate calculation.
An example would be trying to weigh something as light as 10 paper clips on a 50 lb. IQ6200/6500 scale.
You can override this message by pressing PIECES a second time without adding additional parts. However,
using an insufficient sample may adversely affect scale accuracy.
To correct an insufficient sample, add the number of pieces requested and press PIECES. The weight, unit
weight, and quantity of the item appears in each display.
The Insuff lamp normally lights when the sample weight is less than 0.1% of full scale capacity. To verify or
change the threshold at which the Insuff lamp lights, do the following:
1. Press MODE. Hold REZERO and press PIECES.
2. The display should show the value 0.1 for normal operation. To change the Insuff lamp threshold,
enter a value between 0.0 (off) and 0.9 (lamp on if sample is less than 0.9% of full scale capacity).
3. Press MODE twice to exit.
4.1.2 Improving Unit Weight with Recomputation
When the unit weight is developed through sampling, the accuracy of that computation can be improved by
increasing the sample size using the recompute feature. This function works only when the
RECOMP
annunciator is on.
For pieces with a large weight variance, the average unit weight can be more precisely determined by using a
large quantity in the sample. The scale determines the recompute range based on the existing sample. To
recompute a sample: