A&D FZ-1200CT, Instruction Manual

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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. Also, you can visit the A&D website at http://www.aandd.co.jp
for more information.
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?
Is the balance level? Refer to “3-1 Before Use”.
Is the operating environment free from vibration and drafts?
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 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?
Has the balance been warmed up for one hour 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”.
Is the sample of magnetic material such as iron? Caution is required for weighing magnetic
materials. Refer to “3-2 During Use”