1
Prior to use ALE-NC series operation manual
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4
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1-2
For more accurate measurement
To make more accurate measurement, it is necessary to lessen error-causing factors in measurement
to the extent possible. Error-causing factors include not only an instrument error and performance of the
balance itself but also the nature and condition of a specimen, measuring environment (vibration,
temperature, humidity, etc.) and the like. These factors will directly affect measurement result in the
case of a balance with high resolution capability.
1-2-1
Precautions related to measuring environment
Temperature/
humidity/
atmospheric
pressure
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Try to keep the room temperature constant to the extent possible in order to avoid
condensation and indication drift due to change in temperature.
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Low humidity is likely to cause generation of static electricity, resulting in
inaccurate measurement.
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Change of atmospheric pressure is likely to cause change of buoyancy of the air
on the specimen, tare and mechanism of the balance, resulting in inaccurate
measurement.
Vibration/shaking
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It is preferable to locate a measuring room on the first floor or the basement. The
higher the room is, the larger the vibration and shaking become. Therefore, a
highly located room is not suitable for measurement. Rooms near the railway or
roadside should also be avoided.
Air draft
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Places directly exposed to air current from an air-conditioner or to direct sun
generate abrupt temperature change and resultantly cause unstable weight
indication, and therefore, should be avoided.
Gravity
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The latitude and altitude of a measuring location differentiate the gravity that
affects a specimen, giving a different weight indication to the same specimen.
Electromagnetic
wave
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At a location where a strong electromagnetic wave generating object is in the
proximity of a balance, the balance is affected by the electromagnetic wave,
making the balance unable to indicate accurate weight, and therefore, such a
location should be avoided.
1-2-2
Precautions related to measuring table
Vibration/shaking
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Vibrations during measurement destabilizes the indication of measurement value,
leading to inability to make accurate measurement. And so use of a measurement
table that is robust and hardly affected by vibration is required (a vibration-proof
structured table or concrete or stone-made table is suitable). In addition, placing a
sheet of soft cloth or paper under the balance causes shaking or makes keeping
horizontal attitude difficult, and therefore should be avoided.
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The measurement table should be installed in a position free from vibration to the
extent possible. A corner rather than the center of a room is less affected by
vibration and therefore more suitable for installation of the balance.
Magnetism/Static
electricity
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Use of the balance on the table that is subject to magnetism or static electricity
should be avoided.
