Troubleshooting; Checking The Balance Performance And Environment - A&D AD-4212C-300 Instruction Manual

8.1. Checking the Balance Performance and Environment

The balance is a precision instrument. When the operating environment or the operating method is
inadequate, performing accurate weighing will not be possible. If the balance seems to have a
problem with repeatability or to perform improperly, check as described below.
Also, visit our website, http://www.aadd.co.jp/, for "Information Library" and "FAQ".
If improper performance persists, contact the local A&D dealer for repair.
Checking that the balance performs properly
Check the balance repeatability using the calibration weight. Be sure to place the weight in the
center of the weighing pan. Pay attention to the air flow. Use the breeze break, or cover the
balance if necessary.
Check the balance repeatability, linearity and calibrated value using external weights with a
known value.
When the balance is built into a system, remove the balance from the system. Place it on a
solid table and perform checking.
When the balance proper performance is confirmed, refer to page 11 to set up the installation
site.
Checking that the operating environment or weighing method is proper
Operating environment
Is the weighing table solid enough?
Is the operating environment free from vibration and drafts? Has the breeze break been
installed?
Is there a strong electrical or magnetic noise source such as a motor near the balance?
Is there a heat source near the balance?
Weighing method
Does the weighing pan touch the breeze break or anything? Is the weighing pan installed
correctly?
Has the weight value been set to zero by using an RS-232C command (R command) before
placing a sample on the weighing pan?
Is the sample placed in the center of the weighing pan?
Has the balance been warmed up for 30 minutes or more before weighing?
Are the leveling feet of the weighing unit placed flat to the installation surface?
If not, the weight value will be unstable or the specified repeatability can not be obtained.
Improve the installation condition, by securing the weighing unit or reducing the vibration that is
conveyed to the weighing unit.

8. TROUBLESHOOTING

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