During Use - A&D HR-300i Instruction Manual

During Use

3.2.
Note the following items to get accurate weighing data.
Discharge static electricity from the weighing material.
When a 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.
Use a metal shield case.
Wipe a charged plastic sample 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 the temperature difference between the weighed
sample and the environment. When a sample is warmer (cooler)
than the ambient temperature, the sample will lighter (heavier)
than true mass. This error is due to the rising (falling) draft around
the sample.
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
HR-202i, 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.
Charged material
8
Metal case
Grounding
Magnet material
Draft
20°C
40°C
Weighing pan
Fine range breeze
break ring
Shock