Sigma LT is a hand-held, remote controller that networks as many as 25 load banks using CAN bus communications protocol. Operators can monitor and control all networked load banks, or a single unit in the network, to 800 ft. The unit can vary, accept, or reject load on a single unit. Applications include data center simulation of hot zones to determine how an HVAC system reacts to temperature changes at specific server rack locations. A color touchscreen displays three-phase voltage, power, current, and frequency readings, along with selected load.