Current transducer with large aperture for automotive test
Danisense has released its latest current transducer mainly aimed for automotive (EV) test benches and battery testing and evaluation systems. Featuring a very large aperture of 41.2 mm, the DN1000ID current transducer enables power cables with large power connectors to be easily fitted to EV test benches allowing for quick changeovers.
The large aperture is an important advantage as test bench operators often face the issue that the power connectors fitted to the power cables are bigger than the diameter of the cable, making it difficult to fit them in the aperture of the current transducer and often requiring additional work to solve this issue. Comments Loic Moreau, Sales and Marketing Director at Danisense: “Our new DN1000ID device now offers the best compromise between the 1000 A nominal current and aperture size by keeping the best measuring performances in accuracy and phase shift.”
Like all Danisense products the DN1000ID current transducers benefit from the high stability closed loop fluxgate technology. Further technical details include a linearity of 1 ppm, 5 ppm offset and a compact aluminium housing. Additional target applications for the product are power measurement and power analysis, MPS for particles accelerators, gradient amplifiers for MRI devices, precision drives as well as current calibration purposes.
Fluxgate technology
There are many different types of current measurement technologies, from basic shunt and Hall.
However, they cannot deliver the accuracy required for emerging eV, solar, traction and power grid applications that demand accuracy levels to 100s of ppm, while medical MRI equipment and physics institute accelerators can require single figure ppm performance. To address this issue Danisense is offering DC and AC current sensors based on its fluxgate technology which provides measurements down to 1ppm.
Danisense proprietary fluxgate is a closed loop compensated technology with fixed excitation frequency and second harmonic zero flux detection. The magnetic field in the toroid generated by the primary current is counteracted by the compensating secondary current generated by the integrator. The Fluxgate detects magnetic fields in the toroid from DC to less than 100 Hz at sub ppm levels and tells the integrator to compensate for them. At higher frequencies, the feedback winding detects magnetic fields in the toroid at ppm levels and again tells the integrator to compensate for them.
Fluxgate Technology delivers excellent linearity of 1 to 3ppm; ultra-stability with offset versus time of under 1 ppm/year; “ppm level” accuracy; current or voltage output types; as well as a very large and flat bandwidth.
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