8.4 Verifying Calibration
Calibration should be verified periodically depending on user requirements and system usage and should be performed at least monthly. A calibration verification standard artifact is available from Starrett authorized distributors or directly from the Starrett service department. Calibration should also be verified after the system has been serviced or moved. The following is a brief description of the steps recommended for the verification of your machine.
Figure 26. Calibration Verification Standard Placement
Procedure
To validate calibration, perform the following steps:
1. Place the calibrated verification standard in one the six positions on the glass stage as illustrated in the previous figure. Secure the standard with hot melt glue or other suitable retaining method so that stage translation cannot move the standard under any condition.
2. Skew the center of the two end circles. Refer to the MetLogix M3 User Guide for proper alignment procedures.
3. Measure the distance between the 1st and 2nd, 1st and 3rd, 1st and 4th, 1st and 5th, and the 1st and 6th fiducials. Repeat these measurements ten times.
4. Calculate the absolute average deviation for each of the five groups of distance
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