BM series
99
19.4.
Checking the Balance Performance and Environment
The balance is a precision instrument. When the operating environment or the operating method
is inadequate, correct weighing cannot 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 operating environment or weighing method is proper
Operating environment
Is the weighing table solid enough?
Is the balance level?
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
Does the weighing pan edge touch anything? Is the weighing pan assembly 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?
Is the fine range ring installed for weighing with a minimum display of 0.01 mg for the
BM-252
?
Is the fine range ring, small fine range ring, or slide breeze break installed for weighing with a
minimum display of 0.001 mg for the
BM-20
and
BM-22
?
Has the balance been calibrated using the internal mass?
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?
Is the sample charged with static electricity? Is the built-in ionizer (page 30) used to discharge the
sample charged with static electricity.
Is the sample a magnetic material such as iron? Cautions are required when weighing magnetic
materials.
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 an external weight with a
known value.
Check whether the calibration is performed correctly. If an error occurs and the calibration cannot
be performed quickly, the balance may not measure correctly.
19.5.
Asking for Repair
If the balance needs service or repair, contact your local A&D dealer.
The balance is a precision instrument. Use much care when handling the balance and observe
the following when transporting the balance.
Use the original packing material for transportation.
Remove the weighing pan, pan support, rings and dust plate from the balance.
Summary of Contents for BM series
Page 1: ...Analytical Balance BM 20 BM 22 BM 252 BM 200 BM 300 BM 500 1WMPD4002195D ...
Page 8: ...6 BM series ...
Page 113: ...BM series 111 MEMO ...
Page 114: ...112 BM series MEMO ...
Page 115: ...13 ...