Abstract: An overvoltage suppression system is disclosed, such as for construction equipment, for protecting the construction equipment from overvoltages that may occur in day to day operations. An overvoltage suppression system for construction equipment may have a communication network that includes nodes. A data line may be used to electrically connect the nodes of the communication network. A semiconductor device may be electrically connected with the data line. Also, a frame of the construction equipment may be electrically connected with the semiconductor device, where the frame may be a frame common. The frame common may be adapted to include a common electrical point of the communication network.

Abstract: An overvoltage suppression system is disclosed, such as for construction equipment, for protecting the construction equipment from overvoltages that may occur in day to day operations. An overvoltage suppression system for construction equipment may have a communication network that includes nodes. A data line may be used to electrically connect the nodes of the communication network. A semiconductor device may be electrically connected with the data line. Also, a frame of the construction equipment may be electrically connected with the semiconductor device, where the frame may be a frame common. The frame common may be adapted to include a common electrical point of the communication network.

Abstract: Liquid is supplied to a meter test stand at a uniform pressure, and the flow through the meters on the stand automatically is directed to each of three receptacles in sequence at three different flow rates during each test cycle. Level sensors in each receptacle actuate cycling controls and actuate sensing and recording components. The latter components monitor the rate of flow registration of the meters on test and provide an accurate comparison by percent of the measured flow rate to the actual flow rate. A high degree of accuracy is achieved through the use of a phase locked loop and digital control system which responds to the level sensing and cycling controls to provide a print-out of the comparison as a measure of accuracy of the meter at each such flow rate.