Kepco Inc. has added a high-current model to its four-quadrant 1-kW BOP bipolar operational amplifier series. The BOP 6-125MG enables the user to source or sink up to 125 A using a single 3U module with accuracy and readback in current mode of 200 ppm. The unit performs in current mode-voltage limit, as well in voltage mode-current limit. Up to five units can be operated in parallel for a source-sink capability of up to 625 A at 0 to 6 V, and up to three units can be connected for up to 125 A at 0 to 18 V. Switch mode technology provides low dissipation. Applications include battery test and characterization, corrector and injector magnets for medical imaging, and solar cell test and characterization.