Automation System
In pen plotters, "resolution" refers to the shortest possible line, but in electrostatic plotters it refers to:

the speed per inch
dual-axis tracking
the number of dots per inch
how accurately the plotter returns to a specific point
None of these

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Automation System
Time proportioning control:

cannot use a TM990 micro¬computer
None of these
can be used on a PM550 programmable process controller
is less efficient than normal PID control
a and b above.

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