How can an operator verify the accuracy of an electronic radius indicator before a lift?

Using a horizontal measurement to verify the accuracy of an electronic radius indicator is the most effective method. This approach involves measuring the horizontal distance from the center of rotation of the crane to the load being lifted. The radius that the crane operates at is critical for ensuring that the lifting operation is within safe limits, and this measurement allows the operator to confirm that the radius indicator is functioning correctly.

When the horizontal measurement is taken, the operator can directly compare it to what the electronic radius indicator displays. If both measurements align, the operator can be confident that the indicator is accurate, thereby ensuring the safety and effectiveness of the lift. This practice helps prevent potential overload situations, which can lead to crane failure or accidents.

Measuring the load, visual observation, and checking the boom length do not provide the specific confirmation of the radius indicator's accuracy. Load measurement does not assess the radius; visual observation lacks precision, and boom length alone does not account for how that length translates into lifting radius or load capacity.