Rinstrum C500 series, Reference Manual

Page: 46 / 182

7 Calibration and Trade
7.1 Introduction and Warnings
The calibration of the C500 series indicators are fully digital. The calibration results are stored in permanent
memory for use each time the unit is powered up.
Some of the menu settings affect calibration. The BUILD settings must be set before calibration. Changing
these settings after calibration may alter the calibration.
All calibration operations are in the CAL menu. Calibration routines are available in full setup only (not safe
setup).
The calibration program will automatically prevent the indicator from being calibrated into an application
outside its specification. If an attempt is made to calibrate the indicator outside of the permitted range, an
error message will show and the routine will be abandoned. Refer to Section 21.
The indicator has a wide-range amplifier section. The non-trade calibration range of the instrument extends
well beyond the trade approved range. It should not be assumed that just because the indicator has successfully
calibrated a scale, that the scale is correct for trade use. Always check the scale build against the approval
specification.
7.2 General Information
7.2.1 Terminology
A knowledge of basic weighing terms is useful in setting up and calibrating the indicator. These terms are used
throughout the setting procedure and are defined as follows:
ˆ
Weighing range: This is the range of weights which can be measured. The indicator can be setup with 1
or 2 ranges.
ˆ
Division / count-by: The smallest unit of weight change which is displayed. This will be different for
each range. This is setup in
BUILD:E1
and
BUILD:E2
.
ˆ
Fullscale / full capacity: The maximum amount of weight used on the scale. This will be different for
each range. This is setup in
SCALE:CAP1
and
SCALE:CAP2
.
ˆ
Number of divisions: The number of divisions between 0 and full capacity. It is equal to full capacity /
count-by. This might be different for each range. For example, 20000kg / 10kg = 2000 divisions.
ˆ
Units: Describes the unit of measurement used for the weight (kg, t, lb, etc).
ˆ
Loadcell signal at full capacity: This is the loadcell signal at full capacity.
ˆ
Signal resolution: This is the change in loadcell signal for each division.
Example:
ˆ
A 10000kg, 2.0mV/V loadcell is used in an application with a 5000kg capacity, displaying in 5kg steps.
ˆ
The values of each of the above terms is:
– Units = kg
– Capacity = 5000kg
– Count-by = 5kg
ˆ
Number of divisions = 1000 divisions
ˆ
The loadcell signal at full capacity = (5000kg / 10000kg) x 2.0mV/V = 1.0mV/V
ˆ
The signal at capacity = 5V excitation * 1.0mV/V = 5mV
41 C500-600-2.0.3