The wide range of shunt values permit measuring from 0.1 mA to 100 Amps. 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). Also the phase displacement at 100 kHz is small enough to be neglected in all but the highest accuracy measurements. Combined with excellent dc resistance stability, the shunts can be used 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. These characteristics make the A40B shunts ideal for traditional precision current applications such as calibrator verification. Also, the 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 shunts come in four different sizes. The full current shunt set includes:
Voltage output is nominally 0.8 volts for the nominal rated current input. The output is measured by a 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 dc and ac current shunt design gives high performance with minimum external magnetic fields. Plus, the open nature of the dc and ac current shunt physical design maximizes air flow so the shunts have a minimal power coefficient effects. This permits each shunt to be used over a wide range of currents with stable resistance characteristics.
The dc and ac current shunt resistance is designed to minimize interaction with the detector instrumentation. The 100 Amp shunt resistance is 8 milliohms, with shunt resistance increasing to 80 ohms for the 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.
The A40B series of precision DC and AC Current Shunts come with an ISO 17025 Accredited Certificate of Calibration.
The A40B dc and ac precision current shunt set consists of 14 low-inductance coaxial current shunts, adapters and connectors, and a rugged transit/storage case. Designed for currents from 1 mA 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. They exhibit outstanding resistance value stability, with an excellent self-heating power coefficient, and a low temperature coefficient. With all of these characteristics combined, the shunts offer direct measurement of current from dc to 100 kHz with higher accuracy than previous commercially available shunt technology. Now precision measurements can be made in a single step process rather than by more complex traditional ac/dc transfer methods.
|Basic Specification ±μA/A, TCal ±1 °C, ≤50 % RH|
|DC||1 kHz||10 kHz||30 kHz||100 kHz|
Maximum AC-DC Difference
|Shunt Nominal Current :||Maximum AC-DC Difference (± ppm) 1, 2|
|1 kHz||100 kHz|
|1 Specifications indicate the maximum flatness deviation from dc, and include both measured AC-DC difference and the uncertainty of measurement. They are stated at k=2, approximately 95 % confidence.
2 Includes 1-year stability of the AC-DC difference.
3 Specifications for the 1 mA current shunt are for TCal ± 1 °C.
|A40B/SET||Complete set of shunts including :
|A40B-001MA||1 milliamp Current Shunt|
|A40B-010MA||10 milliamp Current Shunt|
|A40B-020MA||20 milliamp Current Shunt|
|A40B-050MA||50 milliamp Current Shunt|
|A40B-100mA||100 milliamp Current Shunt|
|A40B-200mA||200 milliamp Current Shunt|
|A40B-500mA||500 milliamp Current Shunt|
|A40B-1A||1 amp Current Shunt|
|A40B-2A||2 amp Current Shunt|
|A40B-5A||5 amp Current Shunt|
|A40B-10A||10 amp Current Shunt|
|A40B-20A||20 amp Current Shunt|
|A40B-50A||50 amp Current Shunt|
|A40B-100A||100 amp Current Shunt|
Accessories common to all models :
|A40B-ADAPT/LC||LC Male to LC Male adapter|
|A40B-ADAPT/LCN LC||Female to N Male inter-series adapter|
|A40B-CAL/LC||High current adapter to connect two shunts in series for measurement (LC to LC)|
|A40B-CAL/N||Low current adapter to connect two shunts in series for measurement (N to N)|
|A40B-CASE||Fiberglass Transit Case|
|A40B-LEAD/4MM||N to 4 mm double banana connector|
|A40B-LEAD/N||N Male to N Male lead|
|A40B-ADAPT/SPADE||LC male to spade lug terminals|