Model 3411-B Advanced Control Unit 2–11
2. GAUGE OPERATION
Figure 2–2. Drill Rod Positioning
Lower the source rod into the hole. Release the trigger and lock
the source rod into the correct position. A click should be heard
when the source rod is locked into position.
Gently slide the gauge toward the keypad so the source rod
makes contact with the wall of the hole.
SCRAPER
PLATE
METHOD 2
EDGE
MARKS
SCRAPER
PLATE
MARK FOR DRILL
ROD CENTER
MARK FOR SCRAPER
PLATE CENTER
METHOD 1
Figure 2–3. Marking the Test Area
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