Comtest is pleased to introduce Fluke’s 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. Fluke’s A40B series is designed for currents from 0.1mA to 100A. The current shunts are 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. The current shunts offer direct measurement of current from DC to 100kHz with higher accuracy than previous shunt technology. 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 current shunts ensure that the frequency response is very flat (amplitude displacement error relative to dc resistance). The phase displacement at 100kHz is small enough to be neglected in all but the highest accuracy measurements. The current shunts excellent dc resistance stability enables technicians to directly measure current through their full bandwidth. This simplifies precision ac current measurements as the complex ac/dc transfer measurement process will no longer be necessary for many precision current measurement applications.
Fluke’s A40B precision current shunt is ideal for traditional precision current applications such as calibrator verification. The current shunts wide current range allows verification of high current transconductance amplifiers. 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 volts for the nominal rated current input. The output is measured by the voltmeter or detector such as precision voltmeters, ac measurement standards, ac/dc transfer standards, or thermal voltage converters, fitting them to a wide variety of metrology applications.
The radial style shunt design gives high performance with minimum external magnetic fields, plus the open nature of the physical design maximizes airflow so the shunts have a 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 Amp shunt resistance is 8 milliohms, with shunt resistance increasing to 80 ohms for 10 mA shunt. Additionally, the 1mA shunt includes an internal battery operated buffer amplifier. It drives the output voltage so the 800-ohm shunt resistance has minimal interaction with the measurement device.
For more information on Fluke’s A40B precision current shunt set please contact Comtest on 011 254 2200 or www.comtest.co.za.