TAKING A MEASUREMENT
NOTE
When not taking readings, always keep the source rod in
the SAFE position. For added operator safety, the
source rod on the 4640-B gauge automatically retracts to
the SAFE position when the gauge is lifted by the
handle.
If you do not hear a click when the gauge is raised to the SAFE
position, look at the bottom of the gauge to verify that the tungsten
sliding block is completely closed. If the gauge base opening is not
completely closed by the sliding block, the sliding block may
require cleaning. Refer to Appendix C, page C–11 for cleaning
instructions.
CAUTION
Do not store or transport the gauge unless the sliding
block is completely closed. Increased radiation levels
may violate transportation regulations and cause
excessive personnel radiation exposure.
OVERLAY THICKNESS SELECTION
To ensure underlying material does not influence the readings, input
the overlay thickness prior to taking a measurement with the
4640-B.
Press 〈THICK〉 for the display:
Layer Thickness:
x.xx in.
Input and
Press ENTER
It is recommended that unless the overlay thickness is known, the
user should enter a value slightly less than the target thickness. This
ensures that the gauge reads only the new overlay. Input the
thickness of the overlay and press 〈START/ENTER〉.
3–14
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