Second-gen isolated oscilloscope probes

24 November 2020 | Web Article Number: ME202021233

Electrical & Electronics
Instrumentation, Measurement & Control

COMTEST, local representative of Tektronix, has announced its second-generation IsoVuTM Isolated Oscilloscope Probes, the TIVP Series which it says significantly advance the capabilities of the probes first introduced in 2016.

Suchi Rinivasan, General Manager of Tektronix Mainstream Solutions said the second-generation probes extend the applications for isolated probe technology to the entire power system design market with a smaller size, improved ease of use, and enhanced electrical performance.

He said making accurate measurements on high-speed ungrounded systems can be nearly impossible using traditional differential probes.

He added that engineers working with wide-bandgap technologies such as SiC and GaN face difficult challenges to accurately measure and characterise devices due to the higher frequencies and switching speeds involved.

Second-gen isolated oscilloscope probes

“By galvanically isolating the probe from the oscilloscope, IsoVu probes have completely changed how power researchers and designers make wide bandgap power measurements.”

Rinivasan said when the company first introduced, the IsoVu probes it represented. “a true breakthrough for our customers because they could gain actual insight into the performance of the high side of their half-bridge designs, eliminating a significant blind spot.

“With this second generation of IsoVU, we are making this cutting-edge isolated measurement technology accessible to a broader range of customers for such tasks as product level R&D, validation and EMI troubleshooting.”

Like the first generation, the new IsoVu Gen 2 probes use patented electro-optical technologies to capture signals and power the probes without the need for an electrical connection to the oscilloscope.

Compared to traditional high voltage differential probes, IsoVu probes offer a combination of high bandwidth, dynamic range and common-mode rejection ratio (CMRR) over the probe’s full bandwidth.

Non-isolated probes’ CMRR ratings derate quickly as frequency increases, making higher frequency measurements impossible, Rinivasan said, adding that the use of optical cables allows for long cable lengths and makes the probes largely immune to EMI.

“IsoVu technology has been critical in our support of customers adopting our Power Conversion technology in their designs,” said Cam Pham, Global Automotive Field Application Engineer Leader, Wolfspeed, a Cree Company. “With its galvanic isolation capability, IsoVu technology enables us and customers to accurately characterise high side events with confidence.”

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