• What is needed to run the the simulator? Read to get most recent information!
  • Tips for using the simulator.
  • The simulator: gain.exe (click to download). The simulator runs immediately after the download by clicking Open in the download window. Alternatively, you can first save a copy of the exe-file on any directory (folder) on your PC and then run the exe-file, which starts the simulator.

Description of the simulated system

The simulator simulates a gain having the gain K as its parameter. The relation between the input variable, u, and the output variable, y, is:

y(t) = K*u(t)

There is no dynamics (that is, no time-dependent relation) between the output and the input.


The aims of the simulator is to give insight into the non-dynamic behaviour of a gain.


Many physical systems are approximately gains, e.g.:

  • A control valve where the valve control signal u gives approximately a proportional valve opening z.
  • A tachometer (which is a rotational speed sensor for motors etc.) produces an output voltage which is approximately proportional to speed.
  • A (very quick) motor where the rotational speed is approximately proportional to the motor control signal.
  • The proportional term of a PID-controller, which is proportional to the control error.


Start the simulator.

  1. Adjust the gain K to any positive value. Adjust the input signal to any value. Observe how the output value y varies. Is there any dynamic relation between the input and the output?
  2. Repeat Task 1, but with a negative K-value.

[SimView] [TechTeach]

Updated 12. January 2008. Developed by Finn Haugen. E-mail: