If you select
  
 
  button,
  
 
  button of Digital Historical Trend 
  screen menu button or select 'View Settings' of shortcut menu, dialog box is 
  shown such as <Figure 1>.
  
<Figure 1> Example for Digital Trend Settings
You can select data read period between 1min and 60min.
Also, you can set whether to use guide line and whether to display current line at display option part, and start time of trend also can be set.
Trend Time Setting can be set 
  by selecting
  
 button 
  of digital trend screen or
  
 
  button of menu button.
You can increase or decrease the trend start time as 1hour ~ 
  30days(proportion to entire time of trend) intervals by selecting
  
 
  and
  
 
  button of digital trend screen or
  
 
  and
  
 
  button of menu button.
Relate items)