5-16  Function and Performance Checking Method   
5.  Record the distance by 20mm each segment on the transverse targets line by using the 
measurement caliper 
6.  Select the value with the greatest error (to 20mm), calculate the accuracy by using the formula 
below 
 
 
When using a linear probe, record the transverse distance by segment. 
 
When using a convex probe, all transverse targets should be displayed 
integrally in an image. 
 
The measure caliper should be posited at the upper side or lower side of 
the target center. 
As shown in figure below.