17. TROUBLESHOOTING
17-1 Checking the Balance Performance and Environment
The balance is a precision instrument. When the operating environment or the operating method is inadequate, correct weighing can not be performed. Place a sample on the pan and remove it, and repeat this several times. If the balance seems to have a problem with repeatability or to perform improperly, check as described below. If improper performance persists after checking, contact the local A&D dealer for repair.
Checking that the balance performs properly
Check the balance repeatability using an external weight. Be sure to place the weight in the center of the weighing pan.
Check the balance repeatability, linearity and calibrated value using external weights with a known value.
Checking that the operating environment or weighing method is proper
Operating environment
Is the weighing table solid enough (especially for the
Is the balance level? Refer to
Is the operating environment free from vibration and drafts? For the
Is there a strong electrical or magnetic noise source such as a motor near the balance?
Weighing method
Is the weighing pan installed correctly?
Is the
Has the balance been calibrated using an external weight?
Has the balance been warmed up for 30 minutes before weighing?
Sample and container
Has the sample absorbed or lost moisture due to the ambient conditions such as temperature and humidity?
Has the temperature of the container been allowed to equalize to the ambient temperature? Refer to
Is the sample charged with static electricity? Refer to
The
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