A&D BM-252 - 8 Calibration; Calibration Group

36 BM series
8. Calibration
8.1. Calibration Group
Since the balance's resolution is high, weighing values may change due to gravity and daily
environmental changes. It is necessary to perform calibration (sensitivity adjustment) with the weight
in order to keep the weighing values from changing even if gravity or the environment changes.
Calibrate the balance if it is installed for the first time or relocated, or when the weighing values
change significantly in daily inspection.
Calibration means to adjust the weighing value of the balance using the reference weight or
internal mass. Calibration test means to weigh with the reference weight and compare how much
the result deviates from the reference value. (Calibration test does not perform adjustment.)
Calibration (Sensitivity adjustment)
Automatic self calibration ------------------------- Automatically adjusts the balance using the internal mass
depending on the temperature change of the operating
environment or the set time and interval time.
Calibration using the internal mass ----------- Using the internal mass, adjusts the balance with a single touch.
Calibration using an external weight---------- Using an external weight, adjusts the balance.
Calibration test（Sensitivity check）
Calibration test using the internal mass ------ Checks the accuracy of weighing using the internal mass and
outputs the result.
*No adjustment is made.
Calibration test using an external weight ---- Checks the accuracy of weighing using an external weight
(target weight) and outputs the result.
*No adjustment is made.
Notes
Do not allow vibration or drafts to affect the balance during calibration.
When using the data output for GLP / GMP using the RS-232C interface, set "GLP output (info)" of
the function table. Refer to "10. Function Table". The time and date can be added to the GLP report.
If the time and date are incorrect, refer to "10.7. Clock and Calendar Function" and adjust them.
Calibration test is available only when "GLP output (info)" is set to "1" , "2" or "3".
The calibration and calibration test data can be stored in memory. When using memory,
set "Data memory (data)" of the function table. Refer to "12. Data Memory" for details.
Note on using an external weight
The accuracy of an external weight can influence the accuracy of weighing.
Select a weight for calibration and calibration test from the following table.
Model Usable weight
Adjustable range
BM-20 1 g 2 g 5 g 10 g 20 g *
BM-22 1 g 2 g 5 g 10 g 20 g *
-3.000 mg to +3.099 mg
BM-252 10 g 20 g 50 g 100 g 200 g *
-15.00 mg to +15.99 mg
BM-500 50 g 100 g 200 g * 300 g 500 g
BM-300 50 g 100 g 200 g * 300 g
BM-200 50 g 100 g 200 g *
-30.0 mg to +30.9 mg
Bold type*: Factory settings. The weight value can be adjusted within the range above.