GE XLG3 - Manual (Page 100)

User Manual Chapter 7 Measuring Features and Defects 91
About the Measurement Tips
Unlike standard optical tips, ShadowProbe
®
and StereoProbe
®
measurement tips are
factory-calibrated for use with specific probes and will not measure accurately with other
probes. These tips are matched to probes by the serial numbers identified on each optical
tip and each probe label. Calibration data is stored in memory in the probe.
To ensure measurement accuracy, check each tip’s calibration every twelve months.
To display the calibration data, press
. Then select Setup Menu > Measure > Stereo
or Shadow > Cal Info.
To ensure that no mechanical damage has degraded their accuracy, verify measurement
tips each time you use them. See
“Verifying Measurement Tips” on page 108.
To learn which tips are available for which probes, see “Optical Tips” on page 141.
About the Accuracy Index
The accuracy index is a number that indicates the amount of magnification during shadow
or stereo measurements. The higher the accuracy index, the greater the magnification, the
more accurately you can place the measurement cursors, the more accurate your results.
When taking shadow or stereo measurements, you magnify the image not by zooming but
by moving the optical tip as close as you can to the target.
To learn about the settings for the accuracy index — how to turn it on and off, and how to
change the minimum value at which it flashes — see
“Reviewing Settings for
Measurement” on page 41.
MEASUREMENT TIPS
STEREO TIPS SHADOW TIPS
BLK 101
BLU 102 WHT 103
BLU 104
BLK 101
Forward stereo
WHT 103
Forward shadow
BLU 104
Side-view shadow
BLU 102
Side-view stereo
Index=10.9
The accuracy index can be displayed to indicate
the amount of magnification you have achieved.
Accuracy index
(Proximity of tip to target)
Accura
cy