Albuquerque, New Mexico, USA · www.tmresearch.com

Company Overview

T&M Research Products Inc., based in Albuquerque, New Mexico, USA, is the reference manufacturer of coaxial current shunts. Its SDN series current-viewing resistors (CVRs) are the instrument of choice when engineers need to measure large, extremely fast current pulses with uncompromising fidelity — including double-pulse tests on modern SiC and GaN power devices.

History

Rooted in the pulsed-power community of the American Southwest, T&M Research developed coaxial shunt constructions in which the resistive element and the signal path are geometrically arranged to minimise stray inductance. Over decades the SDN series has been cited across countless publications and standards work as the ground-truth current sensor against which other probes are verified.

Strengths

The coaxial geometry achieves very low inductance, flat frequency response into the hundreds-of-megahertz region and known, stable resistance values. Because a shunt is a purely resistive sensor, there is no integrator, no saturation and no waveform distortion — measurements remain trustworthy from DC rise to nanosecond-scale edges. Custom resistance values, current ratings and connectors are routinely produced.

Product Portfolio

• SDN series coaxial current-viewing resistors, from milliohm ranges for kA pulses to higher-value precision shunts
• Custom CVRs matched to specific current, rise-time and mounting requirements
• Matching coaxial signal cables and calibration data per unit

Where a PEM Rogowski probe is convenient, an SDN shunt is authoritative: many laboratories keep one precisely to calibrate everything else.

Probemart / Jectronic Instruments is the authorised distributor of T&M Research in China. Contact us for datasheets, quotations and technical support.