In Mitaka.
I measured the efficiency of coil magnet actuator as same manner as I did before. The signal was generated by the signal generator which has 50 ohm input impedance. First, I adjusted position to set the magnet at center. Then, I changed the position of the magnet. I moved to right side and back side as seen from the front of the mettler and lowered the magnet downwards. When I moved the magnet, zero point (the value when the current is 0A) varied.
[Measured position]
・original
・1mm to right
・1mm to right and 1mm to back
・2mm to right and 1mm to back
・2mm to right and 2mm to back
・1mm below
・2mm below
[Result]
・the efficiency（slope of fitted line）
The efficiency was all the same value.
-5.0 N/A
No change due to changing position was seen.
This value is larger than I measured before (-4.5 N/A).
・offset value (the unit is not [N])
original 0.01g -0.03g
1mm to right and 1mm to back -0.05g -0.06g
2mm to right and 1mm to back -0.07g -0.08g
2mm to right and 2mm to back -0.06g -0.08g
1mm to right 0.06g 0.06g
1mm below -0.13g -0.13g
2mm below -0.25g -0.26g
Left value is when the voltage was changed -3V to 3V, right value is when the voltage was changed 3V to -3V.
When I moved the magnet below, the offset value varied. However, the efficiency did not change.
The change of the efficiency was seen when I measured before, but it could not be seen this time. Moreover, the efficiency was about 10% larger than before.
The attached figure shows the measured and fitted data of original(initial) position and when I lowered the magnet (the offset is different slightly). Other point was almost the same as initial position.
