Differences

This shows you the differences between two versions of the page.

--- slice:z-n [2020/08/21 15:47] – [Links] Michael Radunsky
+++ slice:z-n [2021/08/26 14:26] – external edit 127.0.0.1
@@ Line 20: / Line 20: @@
   - Set Proportional Gain (K<sub>P</sub>) to 0
   - Turn off Integral and Differential portions of the loop (T<sub>I</sub> & T<sub>D</sub>, respectively)
-  - While monitoring the error in temperature on rolling graph on the SLICE-QTC display or an  [[slice:qt#front-panel_inputs_outputs|external oscilloscope]], **slowly** increase K<sub>P</sub> until the error begins to oscillate
+  - While monitoring the error in temperature on rolling graph on the SLICE-QTC display or an  [[slice:qt#front-panel_inputs_outputs|external oscilloscope]], **slowly** increase (~10% per increment) K<sub>P</sub> until the error begins to oscillate
   - Use the {{slice:graph_scale_x.gif}} and {{slice:graph_scale_y.gif}} icons, to scale displayed response appropriately
   - Use the {{slice:graph_pause.gif}} icon to pause the graph
     - Note: the pause icon only pauses the graph, not the servo control
-  - Note K<sub>P</sub> where oscillation begins; this is K<sub>P, cr</sub>, the critical proportional gain.
+  - Note K<sub>P</sub> where oscillations of increasing amplitude begin; this is K<sub>P, cr</sub>, the critical proportional gain.
   - Use the Cursors enabled by touching the {{slice:cursors.gif}} icon to measure the period of oscillation, T<sub>cr</sub>
         - You can use the two rotary knobs or touch & drag the cursors on the touch screen