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7. CALIBRATION
7-1 Calibration Group
The GP series balance has the following modes as a calibration group.
Calibration Automatic self calibration (calibration due to changes in temperature)
Calibration using the internal mass (one-touch calibration)
Calibration using an external weight
Calibration test Calibration test using an external weight (Calibration test does not
perform calibration.)
Correction of the internal mass value
Terms
The following terms are defined as follows:
Internal mass = Built-in calibration weight
External weight = A weight that you have. Referred to as a calibration weight when used for calibration.
Calibration weight = A weight used for calibration
Target weight = An external weight used for calibration test
Caution
Calibration adjusts the balance for accurate weighing.
Besides periodic calibration and before each use, perform calibration when:
• the balance is installed for the first time.
• the balance has been moved.
• the ambient environment has changed.
Do not allow vibration or drafts to affect the balance during calibration.
To output the data for GLP using the RS-232C interface, set “GLP output (info)” of “Data
output (dout)”. For details, refer to “9. FUNCTION TABLE”. Time and date are added to the
GLP report. If the time or date is not correct, adjust them. For details, refer to “9-9 Clock and
Calendar Function”.
Calibration test is available only when “GLP output (info)” of “Data output (dout)” is set to “1” or “2”,
The calibration and calibration test data can be stored in memory. To store them, set “Data
memory (data)” to “3”. For details, refer to “11. DATA MEMORY”.
Caution on using an external weight
The accuracy of an external weight will influence the accuracy of weighing. Select an
appropriate weight as listed below:
Model Usable calibration weight Adjustable range
GP-12K 5 kg, 10 kg
GP-20K 10 kg, 20 kg
GP-30K/GP-30KS 20 kg, 30 kg
GP-32K/ GP-32KS 20 kg, 30 kg
GP-40K 20 kg, 30 kg, 40 kg
-1.5 g to +1.5 g
GP-60K/ GP-60KS 30 kg, 40 kg, 50 kg, 60 kg -15 g to +15 g
GP-61K/ GP-61KS 30 kg, 40 kg, 50 kg, 60 kg -1.5 g to +1.5 g
GP-100K/GP-100KS 60 kg, 80 kg, 100 kg
GP-102K 60 kg, 80 kg, 100 kg
-15 g to +15 g
The calibration weight in bold type: factory setting
The calibration weight value can be adjusted within the range above.