HAMAR LASER STEALTH Series, General Training Manual

Page: 101 / 113

97
Calculating Error in Calibration
1. Calculate the difference between actual micrometer travel and change in the readout display
Determine the difference between the actual .025 in. micrometer move and the number displayed on
the readout window.
•
If the .025 in. physical micrometer move is displayed as a number between 23.7 and 26.3 , (within
5 percent or 1.3 units on the .0001 in. scale) the readout is correct and ready for use.
•
If the difference (error) of the .025 in. physical micrometer move is greater than 5 percent, the
readout will need to be calibrated to the target (see
Calibration Checking Procedure
on Page 96).
•
If the error is greater than 15 percent, return the target and readout to the factory for repair.
Figure 47
Error Calibration Worksheet (Scale .0001 in.)
Micrometer move/Axis Readout Display Absolute Value Percent Error
+.025 in./Vertical V+ (+) 27.2 .0272 8.8%
-.025 in./Vertical V- (-) 25.4 .0254 1.6%
2. For vertical calibration errors greater than 5 percent and less than 15 percent:
If the V+ calibration is greater than 5 percent ( 1.3 units on the .0001 in. scale for a .025 in. move )
and less than 15 percent ( 3.8 units on the .0001 in. scale for a .025 in. move ), an operator can
recalibrate the readout by following the directions for adjusting the calibration trimpots beginning on
Page 98.
3. For vertical calibration errors less than 5 percent:
If the total vertical calibration error is less than 5 percent, proceed with a check of the horizontal
calibration error.