A&D Weighing BM-20 - Manual (Page 33)

BM series 31
8. Calibration
(To Adjust The Weighing Value)
8.1.
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 that you have
Calibration test
Calibration test using the internal mass
Calibration test using target mass that you have
Correction of the internal mass value
Correction of the internal mass value
Caution
Do not allow vibration or drafts to affect the balance during calibration.
Calibration test does not perform calibration.
When using the data output for GLP using the RS-232C interface, set "GLP output (
info )" of the
function table. Refer to " 10. Function Table". Time and date can be added to the GLP report. If it
is incorrect, refer to " 10.7 Clock and Calendar Function" and adjust them.
Calibration test is available only when "GLP output ( info )" is set .
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.
Caution on using an external weight
The accuracy of an external weight can influence the accuracy of weighing.
Select a mass for calibration and calibration test from the following table.
Model Usable calibration mass 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-200 50 g 100 g 200 g*
BM-300 50 g 100 g 200 g* 300 g
BM-500 50 g 100 g 200 g* 300 g 500 g
-30.0 mg to +30.9 mg
Bold type*: Factory setting.
The calibration mass value can be adjusted within the range above.
About the internal mass
The internal mass may change due to corrosion or other damage caused by the operating
environment, or due to aging. Check the internal mass periodically and correct the internal mass
value if necessary. Refer to "
8.7. Correcting the Internal Mass Value".
Display
This indicator means "In process of measuring calibration data".
Do not allow vibration or drafts to affect the balance while the indicator is
displayed.