As the Intentional Transport Electrification Conference (ITEC) has switched to a remote experience, GMW has decided to go virtual! We invite you to view our Virtual Exhibition at your convenience.

GMW customers include automotive manufacturers and suppliers; EV startups in ground, aviation, and water transportation spaces; government agencies including Department of Energy and Department of Defense; regional utilities and transportation agencies for power infrastructure and fleet vehicles.

Our experts in Electric Current Measurement and Magnetic Field Mapping are available for consultation and discussion.

Ian Walker
Senior Applications Engineer

Dr. Zhen Xu
Magnetic Instrumentation Scientist

GMW Presentations

GMW CPC/CPCO Clip-on & Clamp-on Current Probes

GMW CPC Clip-on and CPCO Clamp-on DC/AC Current Probes are light-weight, compact and moisture resistant for test-cell and in-vehicle monitoring, and monitoring battery charging systems, and monitoring grid power delivery systems. Both probe types open and close for convenient installation around existing cables and bus bars.

CPC Clip-on Current Probes:

  • Full-scale ranges from ±250A to ±2000A
  • dc to 75kHz response
  • 27mm aperture
  • Accuracy < 1% of full-scale
  • RMS Noise <0.02% of full-scale
  • 5V power supply (can be powered by standard USB port)

Additional Information:

CPCO Clamp-on Current Probes:

  • Full-scale ranges from ±500A to 16000A
  • dc to 40kHz
  • 77mm and 160mm apertures
  • Accuracy < 1% of full-scale
  • RMS Noise <0.02% of full-scale

Additional Information:

CWT Clip-on AC Rogowski Current Probes

PEM CWT Clip-on AC Current Probes have frequency response recently extended to 50MHz (7ns rise-time), current ranges to over +/-1MA and Coil lengths to over 30m. Applications range from ac power measurements, through power semiconductor switching waveform characterization to lightning current discharge monitoring. The MiniHF versions include electrostatic shielding of the Rogowski Coil to reduce capacitive coupling from very high dV/dt on the primary conductor and extend the frequency response to 50MHz.

Additional Information

Danisense DC/AC High Resolution Current Transducers

Danisense DC/AC Current Transducers have very high resolution and accuracy, wide dynamic range with full-scale current ranges from 12.5A to 10kA and dc to 500kHz(-3dB) for charge-discharge measurements of batteries or motor drive efficiency measurements using power analyzers or high-resolution data loggers.

New unpackaged and programmable pcb-mounted versions allow for mounting in <1U height enclosures with primary current leads either through toroid or connected to pins.

Systems can be configured from single channel, bundled up to 6 channels on a single DSSIU-6 rack–mount transducer interface and power supply unit. See Systems Pricing on the product page.

Additional Information

Bergoz IPCT Zero-flux Current Transducers

IPCT Zero-Flux DC Current Transducers from Bergoz Instrumentation have ranges from 10mA to 5A full-scale. The IPCT features a large 82mm (3.2”) aperture, dc to 4kHz frequency response and current resolution to 10uArms and can be used for dc or ac, differential or leakage current measurements on complete cables for ac-dc chargers, PV to dc battery storage, variable speed drive to motor assemblies. The very high stability and reproducibility of these Transducers enable applications to product development, production quality control or long-term condition monitoring.

Additional Information

Senis 3DACMT-1 AC Magnetic Field Transducer

Senis 3DACMT-1 AC Magnetic Field Transducer is designed for high position resolution magnetic field mapping between wireless charging Send and Receive Coils. The Senis 3DACMT-1 has a small Sensing Head of 15.3mm on a side. Analog signals for each of Bx, By and Bz are provided for input to a Scope, Spectrum Analyzer or Data Logging system. The full-scale amplitude is +/-10mT with Sensitivity of 500mV/mT and 1.5uT resolution covering a frequency range of 10kHz to 200kHz with a phase accuracy at 85kHz of better than 3 degree.

Additional Information

Senis Magnetic Field Mapper

Magnetic Field Mapping System MMS-1A-RS allows a user to create high resolution (150 x 10 x 150um sensitive volume and 2um linear positioning accuracy) map of the magnetic field around an electromagnet or permanent magnet. Due to the unique features of the applied integrated Hall probe, all three components of the magnetic field are measured simultaneously at virtually the same point. Specialized, interchangable probes are available for rotor testing, eddy-current probes for crack detection, sliding probes for in-contact measurements, pickup coils for EMC, etc.

OEM Mapper Systems can also be provided.

Additional Information

ISO-17025 Accredited Calibration

For current instrument calibration, GMW is ISO-17025 accredited from 40A to 8kA at both DC and AC frequencies up to 400Hz. This allows for accredited calibrations of Rogowski Coils, as well as for hall-effect and fluxgate type current transducers. Calibration can be at GMW in San Carlos, California or On-site, at your location.

Additional Information