Reaction Bar and LVDT Height Adjustment
The following steps will guide you through positioning the
reaction bar and LVDT to work properly with the SCB or Lottman
Breaking jig:
1. Loosen the top bolts of the reaction bar to allow
the bar to move freely upward.
2. Enter the test menu .
3. Place the test jig on the ram by aligning the
centering pin in the ram and the slot in the jig.
NOTE: The centering pin can be removed if the jig does
not have a slot.
4. Place an asphalt specimen in the test jig (see
Figure 3).
5. Press the TEST Position button.
6. Raise or lower the reaction bar so that the
loading rod is within 2 mm (thickness of a penny)
but not touching the loading bar on the test jig
and centered over the jig loading bar.
7. Tighten the top bolts of the reaction bar by
hand.
8. Clamp the LVDT in the LVDT holder. Adjust the
LVDT until it reads 2-5 mm while in the TEST
position. This will allow sufficient clearance for
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