Section  12  —  Balancing  Walkthrough 
241 
Step 5 — Perform Trim Balancing 
 
To  perform  trim  balancing: 
1.  Replace  safety  covers,   
2.  Start  the  machine  again.  
3.  Let  the  rotor  settle  to  its  normal  operating  speed. 
4.  Press    to  take  a  trim  reading  —  After  a  few  seconds,  the 
instrument  displays  the  vibration  level  with  the  imbalance  corrected. 
5.  Press    to  accept  this  measurement  —  The  instrument  displays 
the  details  of  the  additional  weight  adjustments  required  to  trim 
balance  the  rotor  (i.e.  to  further  reduce  the  level  of 
vibration/imbalance).  You  can  end  balancing  at  this  point or 
continue  with  another  reposition  of  trim  balance  weights  (as 
indicated)  to  improve  on  the  balance  level.  Repeat  trim  balancing 
until  you  are  satisfied  with  the  results.   
 
 
Taking  a  trim  reading