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
Views: 1454Negative 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
Views: 1454
Rogowski Coils vs. Coaxial Shunts: A Comparison
Coaxial shunt or Rogowski coil for current measurement in double-pulse testing? There is no perfect answer - it depends on which figures matter most to your test, and on installation conditions. The two can be used together without interference and cross-check each other.
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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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Rogowski Coil Low-Frequency and Droop Characteristics
In principle a Rogowski coil cannot measure DC, so its detection sensitivity falls at low frequency; the -3 dB point is usually taken as the low-frequency cutoff. When the signal contains low-frequency components, the measured result can deviate from the actual current - take care in use. The cutoff and its roll-off specification vary by model; the roll-off (droop) characteristic refers to the response to a step pulse and is tabulated in Table 1.
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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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Why Do Probes Have So Many Accessories?
Large instruments ship with all sorts of accessories - but why would a small probe need so many?
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Probe Selection: Understanding the Signal Source
With such a wide choice of oscilloscope probes, selection can be confusing. Here we discuss how the signal source shapes probe choice.
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