protected void notifyMeasurementPeriod(){
  trimTime=System.currentTimeMillis();
  trimValues=readValues((int[])null);
}

protected void notifyMeasurementPeriod ( ) { trimTime = System . currentTimeMillis ( ) ; trimValues = readValues ( ( int [ ] ) null ) ; }
called to indicate the beginning of the main measurement period . there may or may not have been a discard period .
