Weighing scale definition and calibration

Allows you to view and configure the necessary parameters to define and adjust the measurement scale of the weighing instrument.

!These settings are reserved for technical personnel. Accidental changes to these parameters could cause instrument malfunctions.

!When the scale is sealed in compliance with legal regulations, the program does not allow changes to these parameters.

Allow negative weight This option, when activated (ON), allows negative values to be displayed in the weight indicator. The default value is OFF (option disabled). When it is deactivated, in case of obtaining a negative weight value (value less than -19e), the indicator shows an error message.

Weighing unit: Select the unit of measure for which the scale is adjusted and the weight value is indicated.

Decimal places: Enter the number of decimal places on the display according to the scale setting and the unit of measure used.

Range mode The instrument can be configured as “single range”, “double range”, “double interval” (a single range with two different scale intervals). Select the desired option.

Max Maximum capacity of the scale. Enter the value using the keyboard, expressed in the unit of measure you have selected.

e Scale interval. The smallest increment that the instrument can measure. Values are 1, 2, 5, 10, 20, or 50.

The following fields on the “Scale Definition” screen allow to calibrate the scale.
Calibration can be done in two ways:

1. Place a standard mass on the load pan and click the ADJUST SPAN button. The scale will automatically calculate the adjustment from the nominal value of the standard mass.
2. Alternatively, if the relationship between the load cell signal and the measurement scale is known, the necessary adjustment values can be entered on the keyboard.
   

The Current A/D C cts field displays the load cell signal expressed as a 24bit integer in the range −8,388,608 to 8,388,607.

Initial zero It is the load cell signal with the scale platform empty. To automatically obtain the correct value click the ADJUST ZERO button with the scale platform empty.

Slope divider It is the relationship between the load cell signal and the measurement scale of the instrument. The scale calculates the value displayed on the indicator by dividing the cell signal by this number:

• Indication = (A/D C cts – Initial zero) / Slope divider
  

To obtain this value empirically, follow the steps below:

1. Check that the scale is at zero. Otherwise, press the ADJUST ZERO button.
2. Place a load on the scale. Preferably a standard calibrated mass, but failing that, an object with a well-known weight value.
3. Click the ADJUST SPAN button. A dialog box will open in which you must enter the nominal value of the calibration mass that you have deposited on the scale.
   

GEO adjustments are required for automatic correction based on the geographic location of the scale. Weight measures the effect of the acceleration of the force of gravity on an object. The force of gravity varies slightly depending on latitude and altitude. If the scale is used in a location other than the place where it was calibrated, the variation in the force of gravity can introduce significant errors in the indication of the weight.

The Xtrem scale automatically calculates a correction factor when the scale is calibrated in a location other than where it will be used. To do this, it is necessary to enter a geographic location code for the place where the scale has been calibrated and for the place where it will be used. This geographic location code is a value from 0 to 31, which you must select according to the Table of geographical adjustment values

GEO code for adjustment location Enter the GEO code for the location where the scale calibration has been made.

GEO code of the place of use Enter the GEO code for the place where the scale will be used.

When the scale is being calibrated, the code corresponding to the calibration site must be written down in both fields. Once the scale is calibrated, if necessary, change the code in the field GEO code of the place of use.