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Isolated probing system for fast switching signals

Isolated probing system for fast switching signals

New Products |
By Jean-Pierre Joosting



Boosting its cutting-edge oscilloscope portfolio, the new RT-ZISO isolated probing system, developed by Rohde & Schwarz, enables extremely accurate measurements of fast switching signals, especially in environments with high common-mode voltages and currents.

The RT-ZISO will set new standards in isolated probe technology, delivering unprecedented accuracy, sensitivity, dynamic range, and bandwidth for next generation wide bandgap (WBG) power designs with SiC and GaN. Also new is the  RT-ZPMMCX passive probe with MMCX connector, which complements the isolated probing system perfectly for certain measurement tasks.

The RT-ZISO provides precise differential measurements of up to ±3 kV on reference voltages of ±60 kV with a rise time of <450 ps and suppresses fast common-mode signals that can distort and interfere with accurate measurements. Its power-over-fiber architecture galvanically isolates the device under test (DUT) from the measurement setup, providing a much higher common-mode rejection ratio (CMRR) than conventional differential probes. Its key features include bandwidth options of 100 MHz to 1 GHz (upgradeable), a CMRR of >90 dB (>30 000:1) at 1 GHz, an input and offset range of ±3 kV, a common mode range of ±60 kV, and a sensitive input range of ±10 mV.

The RT-ZISO isolated probe is the perfect addition to the Rohde & Schwarz oscilloscope portfolio. With the instruments of the next generation MXO series (MXO 4, MXO 5, MXO 5C), the probe enables measurements with the world’s fastest acquisition in the time and spectrum domain, thanks to the  oscilloscopes’ hardware-based acceleration. In combination with the RTO6, design engineers can use the probe for complex analysis tasks that take advantage of the oscilloscope’s high performance and advanced measurement capabilities.

The RT-ZISO is ideal for a wide range of applications, including switching analysis of power converters with WBG materials, double-pulse testing, floating measurements, shunt measurements, inverter design, and motor drive analysis. The isolated probing system comes with a range of probe tips for different measurement needs, including the micro-miniature coaxial (MMCX) connector, square pins, wide square pins and the isolated passive prober. All connectors are rated for CAT III voltages up to 1000 V. It is the first passive isolated prober on the market that allows users to quickly access the test point without designated connectors. In addition, the use of long bandable cables allows the tips to access the DUT at various angles with no additional mechanical stress.

Along with the RT-ZISO, Rohde & Schwarz is also presenting a new type of passive probe with MMCX connector. The RT-ZPMMCX supports a bandwidth range of >700 MHz with input voltages of ±60 V DC and 30 V (RMS), making it the ideal complement to the RT-ZISO isolated probing system for low-side gate measurements. The MMCX probe has a very low capacitive load of <4 pF, which helps to maintain the best signal integrity for preserving the switching waveform shape and timing.

The RT-ZISO isolated probing system and the RT-ZPMMCX passive probe are both available from Rohde & Schwarz.

www.rohde-schwarz.com

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