Shinko Denshi LF Series, Operation Manual, Page: 16 / 154

LF Series Operation Manual 1 How to Begin
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1-2-2 Precautions on the Samples
Static Electricity
•
Generally speaking, objects made of synthetic resin and glass have high electric
insulating properties and, therefore, are apt to be electrically charged. Measuring
a charged sample as is may cause unstable indications, with resultant poor
reproducibility of the results. With this in mind, be sure to discharge charged
samples before measurement.
Magnetism
•
A sample affected by magnetism indicates different weight values depending on
where it is located on the measuring pan, along with resultant poor reproducibility
of the results.
When a magnetized sample must be measured, first demagnetize it or place an
appropriate pedestal on the measuring pan to adequately separate the
mechanism part of the balance from the magnetized sample for avoiding the
effects of magnetism.
Absorption /
Evaporation of
Moisture
•
Measuring a sample with moisture absorbed or evaporated (volatized)
continuously increases or decreases the values indicated. In such case, measure
the sample in a container with a small opening and sealed airtight with a cap.
Sample
Temperature
•
A difference in temperature between a sample and the interior of a windshield
may cause convection to occur inside the windshield, resulting in erroneous
measurement. Therefore, measure a very hot or cold sample only after allowing
time for its temperature to acclimatize to room temperature. Moreover, to prevent
convection inside the windshield, allow time for the interior of the windshield to
acclimatize to room temperature.
•
The body heat of a person conducting measurement can also affect
measurement results. Avoid holding the sample with bare hands, and use long
tweezers or a similar tool instead. Also refrain from putting your hands inside the
windshield while measurement is in progress.