T&M high-frequency non-inductive coaxial shunt W21.1K64-6.5S-0001 type CVR high-power high-current

Product structure design

 •  Form factor and interface design  

 ◦  The product form factor is square, not a conventional circular coaxial structure, facilitating installation and heat dissipation; the output end uses a BNC connector and can connect to an oscilloscope or measurement circuit.  

  ◦  Both sides use a flange structure, allowing users to drill holes and connect busbars themselves; the flange dimensions are approximately 64 mm × 165 mm, with a stacked upper/lower structure to accommodate high-current scenarios.  

  •  Internal structural features  

 ◦  The interior is a coaxial structure; although the exterior is square, based on heat dissipation and space utilization considerations, this design is more volume-efficient than a circular one while maintaining consistency of coaxial performance.

Key electrical performance

 •  Power and thermal load capacity  

 ◦  High power dissipation, with Joule heat up to 21100 J; suitable for scenarios involving continuous release of large energy, such as traction battery discharge, preventing damage to the measuring element due to overheating.  

  •  Response time and bandwidth 

  ◦  Rise time is generally in the nanosecond to microsecond range; for model w21ek64 specifically, the rise time is approximately 2 μs.   

 ◦  Bandwidth is 250 kHz (0.25 MHz); it is not a high-frequency wideband type, but achieves a balance between transient response and overload capability. 

  •  Resistance value and accuracy 

  ◦  The resistance value is very small; for w21ek64, for example, the resistance is 0.001 Ω, suitable for high-current sampling without affecting the main circuit.    

   Typical application scenarios

 •  EV battery safety testing  

 ◦  Can be used for battery short-circuit safety measurement, capturing microsecond-scale transient high-current waveforms reaching thousands or even tens of thousands of amperes when a collision causes an electrical short circuit or piezoelectric short circuit.    

◦  Customer cases include 兰德新能源 (TOV Land), which as a third-party authoritative laboratory has been using such equipment for automotive battery safety evaluation.  

  •  Suitability for destructive test measurement 

  ◦  Theoretically suitable for all destructive tests with high energy and high transient current, such as electromagnetic pulse and capacitor short-circuit scenarios. 

   ◦  In such applications, the coaxial shunt offers advantages, since it balances transient response speed and overload withstand capability, compensating for the insufficient performance boundaries of Rogowski coils, Hall probes, or fluxgate solutions.