Section  11  —  Balancing  Rotors 
225 
Reference  Mark 
 
Reference  Mark  is  an  optional  item  you  can  use  in  conjunction  with  CH 
Position.  Your  instrument  uses  this  information  to  calculate  where  on  the 
rotor  you  should  place  your  trial  weights  after  taking  an  initial  reading. 
 
You  need  to  enter  the  Reference  Mark  Location  and  CH  Position.  This 
enables  your  instrument  to  calculate  the  trial  weight  angle.   
 
To  enter  your  reference  mark  details: 
1.  Press    Machine  Information  on  the  Balance  Setup  menu. 
2.  Press    Reference  Mark  >  Enter  the  angle  from  the  tachometer 
reflective  tape  to  your  reference  mark  >  Press  . 
3.  Enter  zero  if  these  marks  are  aligned  with  each  other. 
 
NOTE: Once you take the initial reading, your instrument will 
display the suggested trial weight angle in the top right of the 
screen.