A technician works in a company that manufactures micro
scale laser devices in a vacuum chamber.
The tech had to replace the vacuum pump that controls the pressure in
this chamber. To bring this pump back on
line, the tech turns the pump on and lets the chamber reach its steady state
low pressure value (the set point pressure). The tech now must adjust the
programmable controller driven pump control panel settings to values that
automatically try to return the pressure in the chamber back to this pressure set
point value after the tech changed the pressure in the chamber (a disturbance)
by adding a small amount of nitrogen gas into the chamber. The tech tested
three different sets of control panel settings with the three corresponding pressure
versus time graphs shown below.
The technician selected the setting that provided the graphic
response shown as graph number 3. YES
or NO
Submit your answers below the blog, or on www.fl-ate.org.
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