Hi. I am trying to determine the proper settings of the linkage of my barograph so that the pen moves the greatest distance up or down on the chart with as minimal movement of the aneroid disc as possible (in other words, the most sensitivity).
I have placed some images here:
The top image shows the configuration. A metal aneroid disc is attached to a rod that provides vertical displacement with changes in barometric pressure. The rod is then attached to a linkage system. The linkage can be adjusted to either magnify or demagnify the amplitude of the recording pen.
The arrows in the second image show movement throughout the system. The furthest left arrow is movement of the aneroid disc, and the furthest right arrow shows the aneroid rod attached to an adjustable linkage that also moves vertically. The top of the adjustable linkage is attached to an adjustable screw with locknut. Movement of this screw one direction or the other helps form the axle for movement of the recording pen on the chart. The curved arrows show axle movement one way or the other depending on whether barometric pressure is rising or falling.
Now my question is, what would the settings be for both the linkage and the screw so that the smallest change in the aneroid disc causes the largest change in the movement of the recording chart pen? Currently, I have the screw screwed all the way into the axle up to the locknut and I am utilizing the last hole in the linkage (third image down). However, I am not sure this is correct.
Thanks in advance for your help.