High-Temperature Probes For the Climate Chamber: Measurements from –67 °F to 392 °F

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If power electronics and control units need to be tested under realistic thermal conditions, standard probes quickly reach their limits. Special passive high-temperature probes, on the other hand, still deliver reliable measurement results even at 392 °F

In the development of inverters, gate drivers, or battery management systems, thermal cycles are a standard part of the testing program. However, while the test specimens must withstand extreme temperatures, conventional probes often fail even under moderate heat or cold. The result is drift effects, loss of accuracy, or complete failures, forcing developers into laborious workarounds or incomplete test protocols.

Robust Measurement Technology for Extreme Conditions

The ENVI P(U)HT series from PMK fills this gap with passive probes specified for a temperature range of –67 to 392 °F (-55 to 200°C). Depending on the model, the PHT variants operate up to 155°C, while the PUHT versions remain functional up to 392 °F. Despite their high temperature resistance, both series offer a bandwidth of 500 MHz (-3 dB) with a rise time of only 600 picoseconds. This is sufficient for most fast signal transitions in power electronics.

The Technical Details at A Glance

The core of the probes is a patented coaxial design with specially selected components that maintain their properties consistently across the entire temperature range. The input resistance of 4.5 MOhm and the maximum voltage rating of 300 V CAT II or 1,250 V_Peak cover typical applications in automotive and power electronics. A BNC connector with automatic read-out detection automatically sets the oscilloscope to the correct attenuation ratio, thereby reducing operating errors.

Range of Applications from Automotive to Aerospace Business

The high-temperature probes address various application areas: In the automotive industry, they enable functional and endurance testing of control units, inverters, and battery systems under realistic thermal conditions. Power electronics developers can monitor modules, converters, and gate drivers during thermal stress tests without needing to leave the test chamber. In research and development, the probes support material investigations and sensor tests during defined climate cycles, while in safety-critical fields such as aerospace, rail technology, or energy technology, they provide the required robustness.

Passive Technology As An Advantage

The passive design of the probes proves to be a decisive advantage: without active compensation circuits, they are insensitive to temperature drift and do not require additional calibration during thermal cycles. The specified voltage limits must not be exceeded, and the cable requires careful handling to ensure measurement accuracy and insulation.

PMK provides a comprehensive accessory package that enables flexible test setups: insulation caps, IC clips, solder-in pins, and PCB adapters cover various contact methods and facilitate integration into existing test setups.

With the ENVI P(U)HT series, PMK significantly expands the application range of passive probes, enabling developers to perform thermal testing without compromising signal fidelity. For applications where standard measurement technology reaches its limits, the high-temperature probes offer a reliable alternative that combines robustness and precision equally. (heh)

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