A&D A & D Analytical Balance GH-120/GH-200/GH-300/GH-202/GH-252 - Manual (Page 10)

8
3.2.
During Use
Note the following items to get accurate weighing data.
Discharge static electricity from the weighing material.
When weighing sample (plastics, insulator, etc.) could
have a static charge, the weight value is influenced.
Ground the balance, and
Eliminate the static electricity using the optional AD-1683.
Try to keep the ambient humidity above 45%RH at the room.
Use a metal shield case.
Wipe a charged material (plastic sample etc.) with a damp cloth.
This balance uses a strong magnet as part of the balance
assembly, so please use caution when weighing magnetic
materials. If there is a problem, use the underhook (on the bottom
of the balance) to suspend the material away from the influence
of the magnet.
Eliminate temperature differences between the weighed sample
and the environment. When a sample is warmer (cooler) than the
ambient temperature, the sample will appear lighter (heavier) than
the true mass. This error is due to the rising (falling) draft next the
sample. If you touch the sample, the same type error will occur.
Do not touch the sample directly with your hand. Use tweezers or
other tools.
Make each weighing gently and quickly to avoid errors due to
changes in the environmental conditions.
Before weighing with a minimum display of 0.01 mg for the
GH-252 and GH-202, the "fine range breeze break ring" can be
installed in place of the "breeze break ring" to avoid errors
caused by drafts.
Do not drop things upon the weighing pan, or place a weight
beyond the range of the balance on the weighing pan.
Do not use a sharp instrument (such as a pencil or ball point pen)
to press the keys, use your finger only.
Magnet material
40°C 20°C
Draft
Weighing pan
Charged material
Grounding
Metal case
Shock
Fine range breeze
break ring