Initial run

 
Test runs start with the initial run. The rotor is left in its initial condition. Vibration is measured at constant speed.
Generally, a balancing run will always include the following steps:
 
  • Changing the mass
  • Measuring vibration
  • Decision based on the results
 
Since there is no mass change needed for initial runs, step 1 can be skipped and the procedure starts at step 2,  vibration measurement. There will be no information about unbalance yet after the initial run.
 
 
There is an information on the right side of the list which is explained here.