A&D BA-T Series Instruction Manual page 123

AND-MEET (with the touch panel software version 1.019 or later)
Display settings: MENU key
AND-MEET button
2 Back button
Name
Start button
1
Back button
2
AND-MEET Measurement Environment Evaluation Tool
High-sensitivity analytical balances detect minute environmental changes that users cannot detect. This
causes the measurement value to be unstable. This is especially so with the BA-6TE/6DTE, a
microbalance with a minimum display of 1μg or a semi-microbalance of a minimum display of 10μg.
Using these balances, the specified repeatability may not be obtained in many cases, depending on the
environment where the balances are installed. Users may feel uneasy when it happens. However, it is
not necessarily resolved even if they ask the balance manufacturers for help.
AND-MEET constantly monitors the installation environment of the balance while simultaneously
loading and unloading the internal weight of the balance automatically over 24 hours. AND-MEET
evaluates temperature changes and the corresponding repeatability of measurement data over time.
The span value is calculated by subtracting the zero point value from the value obtained when the
internal weight is loaded on the balance. Then, the standard deviation of the ten consecutive span
values is calculated to obtain the repeatability. The result is presented as a graph for visualization.
Time is plotted on the X-axis of the graph. Changes in the zero point, span value, repeatability and
temperature are plotted on the Y-axis. Through the graph, interaction between each item (changes in
the zero point, span value or repeatability) and environmental changes (time and temperature) can be
evaluated.
AND-MEET graph: points to check and measures to take
A zero point drift occurs due to changes in the balance internal temperature caused by turning the
power on. Warm up the balance until the balance reaches equilibrium with room temperature.
Changes in temperature in a day are great:
Use an air conditioner to avoid changes in temperature.
Sudden temperature changes occur:
If the causes of the temperature change such as a heat generating device are known, eliminate the
causes.
Calibration test/check button
[AND-MEET] screen
Starts AND-MEET and displays [AND-MEET] screen.
Returns to the [Calibration test/check] previous screen.
123
1 Start button
Description