Capacity (Force Measurement)

Select a dynamometer whose rated capacity is 1.25 to 2 times the expected maximum applied force. This provides a safety margin against accidental overloads while keeping the operating range where resolution and accuracy are meaningful. For example, if maximum expected tension is 8,000 lb, a 10,000 lb dynamometer is the correct selection. Dynamic Measurement Systems' technical staff can assist with capacity selection — call 281-405-0606.

In a mechanical dynamometer, exceeding rated capacity can cause permanent spring set — the spring deforms and no longer returns to zero correctly, producing systematically incorrect readings. In electronic dynamometers, it can overload and damage the strain gauge element. Both outcomes require repair and recalibration before the instrument can be trusted. Dillon AP dynamometers include overload protection to minimize damage from single accidental overload events.

The required capacity depends on conductor type, span length, and tension specification. For distribution line work, 5-inch AP models in the 10,000–20,000 lb range typically cover most applications. For transmission and EHV stringing, higher-capacity 10-inch AP models and EDxtreme configurations up to 550,000 lb are used. Contact Dynamic Measurement Systems at 281-405-0606 to match the correct model to your specific stringing application.