Power supply targets battery test applications

Single and two-channel models of the NGM200 power supply series have be announced by Rohde & Schwarz.

They are part of the same family as the NGL200 and are intended for developing battery-powered equipment operating at up to 20V and drawing currents up to 6A.

The NGM200 shares the same specifications as the NGL200 to supply stable outputs with a minimum of residual ripple and noise. Devices that switch from a few microA in sleep mode to several A in active mode benefit from the exceptionally fast load recovery time of less than 30 micro seconds, observes Rohde & Schwarz.

The two-quadrant architecture provides both source and sink functions, to simulate the charging and discharging of batteries as well as to operate as an electronic load. For ease of operation, there is a large capacitive touchscreen.

With the R&S NGM200 series, Rohde & Schwarz introduces four new features. First, there is the FastLog function that captures spikes even in the micro second range. There are also additional measurement ranges that increase the read-back accuracy in the lower ranges, a battery simulation option that supports the modelling of batteries to simulate real life conditions and a built-in digital voltmeter that measures voltage values at any point in circuits of the device under test.

To analyse device performance, users can capture variations in voltage or current values as short as a few micro seconds, says Rohde & Schwarz, using the high-speed data logging function FastLog. The NGM200 power supplies log measurement values for voltage and current at an acquisition rate of up to 500ksamples per second. A two-channel NGM202 can run data acquisition on both channels in parallel.

For read-back resolution and accuracy, the NGM200 power supplies have four current and two voltage measurement ranges, resulting in a read-back resolution of 10 nano A / 5 micro V in the smallest range.

For any battery-driven equipment, simulating changes in battery output performance provides realistic power conditions at different stages of the battery life. The integrated battery model editor can be used to create battery models by defining characteristics such as the state of charge, open-circuit voltage and equivalent series resistance. Pre-defined data sets for the common battery types (lead, lithium-ion, nickel-cadmium, or nickel-metal hydride) are included.

The NGM-K104 option activates an additional port, to connect the internal voltmeter in the NGM200 to any point in a circuit to measure the potential difference.

The NGM201 and NGM202 power supplies are available now from Rohde & Schwarz and selected distributors.


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