Rice Lake MSI-9850 CellScale RF Digital Indicator - Operator Manual - Manual (Page 51)

MSI CellScale ® System • 9850 User Guide Page 51
MEASUREMENT SYSTEMS INTERNATIONAL
Firmware Version 5-XX for 2450 Modems
To Clear the Total Value (Current ID Code only)
At any time during the following procedure the EXIT key cancels the Clear operation. Clears ID’s statistics registers as well.
1) Press VIEW ∑ . The current total is displayed.
2) Press CLR . The “ARE YOU SURE” screen gives an opportunity to change your mind.
3) To complete the totaled weight deletion, press the ENTER key.
To Clear All the Totals and Statistics of all ID Codes at once.
This procedure deletes every totaled weighment in every ID code of the current channel. Please make sure all data is recorded as necessary before proceeding.
1) Press VIEW ∑ . The current total is displayed.
2) Select “Grand” total by pressing [1] .
3) Press CLR . The “ARE YOU SURE” screen gives an opportunity to change your mind.
4) To complete the totaled weight deletion of all current channel ID Codes, press the ENTER key.
Clear Last Total
The “Clear Last Total” function key (see Section 4) provides a means to clear just the last totaled data without
clearing the entire total register. Use this when a weight is totaled inadvertently or a load drops outside the con-
tainer, or any other circumstance where just the last total should be deleted from the overall total. “Clear Last
Total” is the default mode for ENTER - [F1] .
STATISTICS
Statistics works in conjunction with the Total function and adds MIN, MAX, Average, Standard Deviation, and
Coefficient of Variance. All these computations are kept for every ID Code independently. The number of samples
that statistics can be calculated for is limited only by memory requirements and will vary from a few thousand to
>100000 samples. Individual samples are not stored. If needed, individual samples can be logged through either
the RS-232 port or into data logging memory using the “PRINT on TOTAL” function.
A “GRAND TOTAL” function is also included with the Statistics function. The Grand Total adds all the weight
in all the ID Codes and provides the following information: GRAND TOTAL, Number of Totals, and the Overall
Average (GRAND TOTAL divided by Number of Totals).
Statistics are viewed using the
VIEW TOTAL key, then selecting “STATS” with the [2] key, or program a func-
tion key to “Show Statistics” .
Definitions and Formulas
AVERAGE – is computed by dividing the total by the number of samples.
MIN – is a single weight register that records the minimum weighment that was added to the total.
MAX– is a single weight register that records the maximum weighment that was added to the total.
STANDARD DEVIATION – is a measure of how widely values are dispersed from the average value (the
mean). The 9850 uses the “non-biased” or “n-1” method that is based on sampling a portion of each available
weighment. Standard Deviation uses the following formula where x is equal to the total, and n is equal to the
number of samples:
COEFFICIENT OF VARIANCE – is a relative dispersion calculated from the sample standard deviation and the
mean with the following formula:
GRAND TOTAL – is computed by adding together the totals of all the ID Codes (adjusted to the default unit set
in calibration if necessary).
GRAND AVERAGE – is computed by dividing the Grand Total by the number of samples of all the ID Codes.
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