Fluke has introduced the new A40B series precision current shunt set that consists of 14 low-inductance coaxial current shunts, adapters and connectors and a rugged transit/storage case. The series is designed for currents from 0,1 mA to 100 A and is designed for laboratory use in making directly measured absolute AC or DC current measurements as well as AC-DC current transfer measurements.
Fluke’s current shunts exhibit outstanding resistance value stability, with excellent self-heating power coefficient and low temperature coefficient. They offer direct measurement of current from DC to 100 kHz with high accuracy. Technicians can take precision measurements in a single step process rather than by more complex traditional AC-DC transfer methods.
The physical construction and the components used in the shunts ensure that the frequency response is very flat (amplitude displacement error relative to DC resistance). The phase displacement at 100 kHz is small enough to be neglected in all but the highest accuracy measurements.
The current shunt is suitable for traditional precision current applications such as calibrator verification. The wide current range allows verification of high current trans-conductance amplifiers and the low phase-shift error is critical for measurement of non-sinusoidal wave shapes, as found in power quality or sampling digital wattmeter measurement applications.
The voltage output is nominally 0,8 V for the nominal rated current input. The output is measured by a detector such as precision voltmeters, AC measurement standards, AC-DC transfer standards or thermal voltage converters, making them suited to a wide variety of metrology applications.
The radial style shunt design gives high performance with minimum external magnetic fields, while the open nature of the physical design maximises airflow so that the shunts have minimal power coefficient effects. This allows each shunt to be used over a wide range of currents with stable resistance characteristics.
The current shunt resistance is designed to minimise interaction with the detector instrumentation. The 100 A shunt resistance is 8 mΩ, with shunt resistance increasing to 80 Ω for the 10 mA variant. Additionally, the 1 mA shunt includes an internal battery-operated buffer amplifier. It drives the output voltage so that the 800 Ω shunt resistance has minimal interaction with the measurement device.
For more information contact Comtest, +27 (0)11 254 2200, [email protected], www.comtest.co.za
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| www: | www.comtest.co.za |
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