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If you're expecting that the deadband is +/- 0.1Hz, then test the frequency response of the governor with 0.09Hz and 0.011Hz deviations. If you see no response for the first simulation, and then a very small response for the second simulation, then you can be confident that you've "found" the deadband. Do the same for negative frequency deviations. In field tests of governors where you're not sure what the governor transfer function is (e.g. an old governor), you would do this type of test to try to identify if there is a deadband.