A&D BA-T Series Instruction Manual page 16

Precautions during use for more accurate weighing
For precise and accurate weighing, please take notice of the
following.
Weighing errors may occur due to the influence of static
electricity. Note that if the ambient humidity drops below 45% RH
insulators such as plastics are liable to have static electricity.
Ground the balance and perform the following as needed.
A DC type ionizer that produces no currents of air is available for
the BA-T series balances. Refer to
remove static electricity from the charged sample directly.
Increase the relative humidity at the place where the
balance is installed.
Weigh the sample in a conductive metal container or the
like.
Wipe off charged materials such as plastic with a damp
cloth to suppress static electricity.
Influence of magnetism may cause weighing errors.
When measuring magnetic materials (iron, etc.), keep the
sample away from the balance main body by means such as
underhook weighing.
Place the sample in the center of the weighing pan.
Weighing errors may occur if there is a difference between the
ambient temperature and temperature of the sample (and the
container). For example, when the room temperature is 20 °C,
convection occurs around a Petri dish or watch glass that is
40 °C and the balance displays a value lighter than the actual
weight. Before weighing the sample and the container, try to
acclimatize them to the ambient temperature.
Perform the weighing operation carefully and quickly. If
measurement takes a long time, error-inducing factors will
increase due to changes in temperature and humidity in the
weighing chamber, air turbulence or reaction/humidity absorption
by the sample.
Do not leave the sample on the weighing pan for an extended
period of time. If a sample is left on the weighing pan for a long
time, the measured value will change due to deviation from the
zero point caused by environmental changes or due to creep
phenomenon.
When placing a sample on the weighing pan, do not drop it, or do not place a sample greater than the
balance weighing capacity. In addition, place the sample in the center of the pan.
With the highly sensitive BA-6TE, the weighing value may fluctuate after the stabilization indicator lights
up. It is advisable to set a certain reading time (10 seconds, etc.) after the stabilization indicator lights
up and read the value.
"22. Ionizer (AX-ION-25)" and
16
Metal case
Charged sample
Ground
Magnetic material
Room
temperature 20 °C
Convection
No impact shock
Good
Ionizer
Underhook
weighing
40 °C
Bad