Verifying Measurement Tips - GE Everest XLG3 VideoProbe Operating Manual

112 Chapter 7 Measuring Features and Defects

Verifying Measurement Tips

Verify measurement tips each time you use them to ensure that no mechanical damage
has degraded their accuracy.
Every XLG3 system equipped with measurement capability is shipped with a
measurement verification block. This tool lets you verify the accuracy of measurement
tips. It contains optical measurement targets whose accuracy is traceable to the United
States National Institute of Standards and Technology (NIST) measurement standards.
These are the part numbers for the verification blocks used with the XLG3 system:
VER2400B
VER2600C
XLG3TM84VER
Each measurement verification block comes with a calibration schedule and a certificate
of calibration (C of C), which notes the calibration date and due date.
Measurement verification block
To Verify a 3D Phase, ShadowProbe or StereoProbe Measurement Tip
1. Attach the measurement tip securely.
2. Insert the tip into the appropriate test chamber.
3. Measure the test target that matches the units you use: inches or mm.
4. Evaluate your results.
An experienced user can achieve a measurement of 0.100 ± 0.005 inches
(1.00 ± 0.05 mm). If your measurement does not fall within these limits, try the
suggestions under
For 3.9 mm systems
For 6.1 mm systems
For 8.4 mm systems
Test targets inside block
"Troubleshooting Measurements"
GE Inspection Technologies XLG3 VideoProbe System
0.1-inch target
1-mm target
on page 113.