A&D AD-4212C-600 Instruction Manual page 15

 Errors due to airflow and measures to take
Where the influence of ambient airflow is great such as: close to an
air conditioner, door or passage way. Even very subtle airflow that
is hard to be detected may influence the weighing operation.
 Avoid those areas as a weighing site.
 If weighing is to be performed in such an area, use a breeze
break or take other appropriate measures.
Where the influence of heat or drafts is great
 Eliminate temperature differences 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.
 Do not touch the sample directly with your hand. Use tweezers
or other tools.
If you touch the sample, the same type error described above
will occur.
 Do not perform weighing where it is exposed to direct sunlight. Weighing errors may occur due
to sudden temperature change or drafts.
 Errors due to vibration and measures to take
Where the influence of vibration is great, such as:
(1) Soft ground (2) Second or higher floor (3) Near center of a floor far from pillars (4) Seismic
isolated structures (5) Near tall buildings.
In the areas listed above, the scale may yield unstable weight values on windy days or after an
earthquake. Especially in case of (4) and (5), weight values may be unstable for a long period of time
because of long lasting low-frequency vibration after strong winds or an earthquake.
15
Draft
40 C
20 C