Commissioning with Terminal PR 5610 Installation Manual
126 Sartorius
5.6 Weighing point calibration
During calibration, the relationship of display and measured variable (weight) is determined.
This relation is determined by the two entries
• Deadload (weight of the empty scale
Deadload
) and
• Scale measuring range (
Span
).
During calibration, these two parameters are determined by
• a physical weighing operation/ weighing point calibration with weights or by
• entry of the equivalent input voltage in mV/V.
⇒ When calling up mask 'weighing point calibration' with CAL-switch open, tare memory and zero set memory
are erased. Moreover, the following functions are disabled during weighing point calibration: Test, automatic
zero tracking, taring and zero setting.
5.6.1 Calibration data
The weighing point calibration parameters are described below. The entries and the corresponding error messages are
described in the following sub-sections.
Fullscale
The full scale value determines the maximum weight which can be measured. Permissible entries are within the
limits of the full scale value:
overall weight range
within 0.1 00 and 99999 00
in g, kg, t or lb.
The value must be divisible by the step width and must have max. 3 digits behind the decimal point.
Calipoint
This is the value of the
calibration weight weighing point calibration with weights or the
theoretical calibration weight weighing point calibration without weights
Deadload
The value of the unloaded scale / empty hopper is the deadload. The input voltage equivalent to this weight
value is displayed/ stored in mV/V.
Span
• The span is determined by calibration by means of weights or
• must be entered during calibration without weights.
The span indicates the equivalent input voltage in mV/V related to the scale FSD (full scale):
span [mV/V] =
full scale load cell sensitivity C [mV/V]
load cell capacity (sum of all load cells)
⋅
Span in [mV/V]
Full scale as a weight value
Load cell sensitivity C [mV/V]
Load cell capacity ( = sum of all load cells) as a weight value
Resolution cd/c
The resolution c/d indicates the number of internal counts ( = result of analog conversion) related to the
stepwidth ( = smallest division d, by which the display value can change).
This value should be as high a possible related to 1. The resolution cd/d is the inverse value of resolution c/d
multiplied by 100 (cd, Centi-d =one hundredth of a display step).
Sensitivity µV/d
The sensitivity µV/d indicates the effective voltage per step (scale interval). For 'legal for trade' applications this
value has to be equal or greater than the limits given in chapter 6.1.2.
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