Rohde & Schwarz has entered the market for power source measurement units (SMU) with two new systems.
The NGU201 and NGU401 SMUs enables simultaneous sourcing and measuring of currents and voltages with high precision. The two-quadrant NGU201 addresses wireless device battery tests and automatically switches from source mode to sink mode at a defined positive input voltage. The four-quadrant NGU401 can also switch at negative voltages, supporting source measurements for a vast range of power supply types.
The current feedback amplifier technology used in the power source designs provides both maximum sensitivity and accuracy to reliably measure currents from nA to A in a single sweep. To handle rapidly changing load conditions typical of battery-powered communications devices switching between sleep and transmit modes, the NGU units have an optimized control loop load providing a recovery time of under 30 μs with minimum overshoot.
The NGU SMUs include six current ranges from 10 µA with 100 pA resolution, to 10 A with 10 µA resolution. For all ranges, accuracy up to 0.025 % is achieved. Voltage is measured with 10 µV resolution in the 20 V range and 1 µV resolution in the 6 V range. For the typical measurement problem of capacitance at the input to the device under test, the NGU series has a variable capacitance mode adjustable in steps from 1 µF to 470 µF, compensating the capacitance, so that the current is displayed as if it was measured directly at the device under test. Devices up to 20 V, 8 A, and 60 W are all supported.
The four-quadrant NGU401 is a specialist unit for semiconductor testing. It provides source measurements for any equipment requiring source and sink voltages in the range from –20 V to +20 V. In addition to the voltage regulation mode of power supplies, the NGU includes a fast current regulation mode to avoid damaging current-sensitive devices under test, such as LEDs or other semiconductors. An external arbitrary waveform source connector turns the NGU401 into an AC source and makes it possible to simulate glitches or unstable power supplies of up to 1 kHz.
The two-quadrant NGU201 power source is optimized for battery drain analysis of any battery-powered device, including mobile phones, tablets, and the full range of IoT equipment. Design engineers can use it to simulate real-world battery characteristics. Once the battery model characteristics are defined, they can be re-used whenever required. With its 8 A maximum current, the instrument even supports fast-charge applications.
In addition to the dedicated power source measurement features, the NGU series also includes features common to all specialty power supplies from Rohde & Schwarz. The data acquisition rate of 500 ksample per second offered by the FastLog functionality captures voltage and current levels every 2 μs so that even the shortest intermittent glitches are detected. With the optional built-in digital voltmeter, users can check voltages at any point in the device under test as well as the input voltage.
The NGU201 and NGU401 source measure units are part of the R&S Essentials portfolio, and are now available from Rohde & Schwarz and selected distribution partners.
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