During Use - A&D GX-300 Instruction Manual

3-2 During Use

Discharge static electricity from the material to be
weighed (hereinafter referred to as sample). When a
sample could have a static charge, the weighing data is
influenced. Ground the balance and try the following:
Eliminate the static electricity by AD-1683 as an accessory.
Or try to keep the ambient humidity above 45%RH.
Or use a metal shield case.
Or wipe a charged plastic sample with the wet cloth.
This balance uses a strong magnet as part of the
balance assembly, so please use caution when
weighing magnetic materials such as iron. 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.
Cancel the temperature difference between a sample and the environment. When a sample is
warmer (cooler) than the ambient temperature, the sample will be lighter (heavier) than the
true weight. This error is due to a rising (falling) draft around the sample.
Make each weighing gently and quickly to avoid errors due to changes in the environmental
conditions.
Do not drop things upon the weighing pan, or place a sample on the pan that is beyond the
balance weighing capacity. Place a sample in the center of the weighing pan.
Do not use a sharp instrument such as a pencil to press the keys. Use your finger only.
Press the RE-ZERO key before each weighing to prevent possible errors.
Calibrate the balance periodically so as to prevent possible errors.
Take into consideration the affect of air buoyancy on a sample when more accuracy is
required.
Keep the balance interior free of dust and foreign materials.
The breeze break (GX-200/300/400/600/800/1000 only) and the clear main unit cover are
provided as accessories. The breeze break components may be charged with static electricity
when they are unpacked or when the humidity is low. If the weighing value is unstable or the
balance has a problem with repeatability, remove the breeze break. Or wipe the clear plates
with a moistened cloth, use an accessory DC static eliminator, AD-1683, or apply an anti-static
spray.
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