Rohde & Schwarz has expanded its lineup of test and measurement equipment with the addition of two new source measure units (SMUs) to meet specialized power supply testing needs. The company’s new two-quadrant model NGU201 addresses wireless device battery tests and can switch from source mode to sink mode at a defined positive input voltage. The four-quadrant NGU 401 can conduct the same testing at both positive and negative voltages, supporting source measurements for a wide range of power supply types.