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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 FX-120i WP /200i WP /300i WP, the
balance with a minimum weighing value of 0.001 g)?
Is the balance level? Refer to "3-1 Before Use".
Is the operating environment free from vibration and drafts? For the FX-120i WP /200i WP
/300i WP, has the breeze break been installed?
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 waterproof diaphragm deformed? Is the waterproof diaphragm free of foreign materials?
Is the RE-ZERO key pressed before placing a sample on the weighing pan?
Is the sample placed in the center of the weighing pan?
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 "3-2 During Use".
Is the sample charged with static electricity? Refer to "3-2 During Use".
The FX-120i WP /200i WP /300i WP is prone to be affected by static electricity when the relative
humidity is low.
Is the sample of magnetic material such as iron? Caution is required for weighing magnetic
materials. Refer to "3-2 During Use"
17. TROUBLESHOOTING
59
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