Probe Specifications Explained
Probes have many specifications, all tied to getting correct data from your application - today we look at what they are.
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T&M Coaxial Shunts: User Guide
A user's guide to T&M coaxial shunts.
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Overlooked Probe Usage Mistakes
Anyone who uses an oscilloscope regularly depends on probes; some enjoy excellent results, others are disappointed.
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Fluxgate vs. Hall-Effect Current Sensors
Hall current sensors detect current with a Hall element sensing the external field. The chip is susceptible to ambient disturbance with appreciable offset and temperature drift, and the core must be cut with an air gap - inherent limits on accuracy and interference immunity. Fluxgate sensing is based on classical control theory instead of a sensing chip: insensitive to the environment, virtually free of offset and temperature drift, with no air-gap cut, low reluctance and stable flux - delivering high accuracy, high sensitivity and fast response.
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IWATSU SS-660P: A High-Frequency Rogowski Probe for Direct Switching-Parameter Measurement on TO247-4
The distinctive feature of the TO-247-4 package is the fourth lead to the gate driver: it removes the influence of the emitter lead's high-frequency stray inductance in the gate loop, so the IGBT responds faster to the drive. The faster response of SiC IGBTs and MOSFETs cuts switching energy loss and allows faster turn-on and turn-off.
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PPM-Level Current Accuracy with Fluxgate Sensors
A fluxgate sensor measures weak magnetic fields through the nonlinear B-H relationship of a high-permeability core driven into saturation by an alternating field. The core acts as a 'gate' through which the flux is modulated, inducing a voltage. Measuring the field produced by a current gives an indirect current measurement.
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Negative Current in GaN Double-Pulse Testing
GaN device: SYSTEM GS66508T evaluation: ACPL-P346 pulse: IWATSU IWASTU DG8000, 6 oscilloscope: DS-8108, 8 1G bandwidth, 12BIT resolution power supply: SPV600VDC4000W, DC600V, 4000 W high-voltage differential probe: PMK BUMBLEBEE, 2000 VRMS, 400M current T&M SDN-414-10, 0.1, 2G Rogowski coil SS-286, 30M 1200 A, issue: double-pulse medium-,, and
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GMW Hall-Effect AC/DC Probes: Overview and Performance Review
The GMW CPC/CPCO series clamp-on (open) Hall current sensors measure AC and DC from DC to 75 kHz (max) and 0-16 000 A with 1% overall accuracy, for EV, motor, PV-inverter, VFD, battery charge/discharge and electromagnetic-actuator current testing - typically alongside power analyzers, recorders, DAQs and oscilloscopes.
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Selecting T&M Non-Inductive Coaxial Shunts for Double-Pulse Ids Measurement
A coaxial shunt is essentially a very small resistor that measures current by Ohm's law - typically for large pulsed currents. The right shunt depends on the measurement scenario; selection comes down to the factors below.
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Understanding Signal Measurement Bandwidth
Capturing a complete, faithful signal is the engineer's core concern. At high frequencies, waveform fidelity is closely tied to instrument bandwidth.
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