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Measure Tech's AC-DC current shunt (Model number EL-7520) is a high accuracy four terminal instrument for calibrating AC or DC currents from 0 to 20 amps and frequencies up to 5 kHz. This product is a non-inductive current shunt, which provides inexpensive but highly accurate methods to calibrate transconductance amplifiers and other current calibrators. The unique and versatile construction of this instrument makes it a valuable device used for a calibrating standard providing traceability to the National Institute of Science and technology (NIST).
The EL-7520 current shunt is supplied in a durable metal enclosure which is tested to the electromagnetic compatibility requirements of MIL-T-28800. In addition, the unit has a continuously operating ventilating fan which cools the shunt as a stabilizing aid. All products are provided with the actual value of resistance within 10 ppm of the value marked on the front panel. Special processing of the resistance materials developed by Measure Tech has made the device not only a highly reliable current shunt but also a reliable and stable resistance standard to be used for resistance calibration with a drift of less than 10 ppm per year.
| Design & Performance Specifications | |
| Nominal resistance | 0.01 Ω ± 1% |
| Maximum current | 20 ADC or RMS |
| Accuracy of calibration value | DC: ± 0.010% DC to 1kHz: ± 0.025% 1 kHz to 5kHz: ± 0.075% |
| Burden voltage | 0.25 V at 20 A |
| Power coefficient | Less than 0.001% at 20 amps |
| Temperature coefficient | 10°C to 18°C: 5 ppm/°C 18°C to 28°C: 2 ppm/°C 28°C to 40°C: 5 ppm/°C |
| Input power to operate fan | 115 V ± 10% (as specified in MIL-T-28800) |
| Mechanical Specifications | |
| Dimensions | 12.0" L × 8.37" W × 3.47" H |
| Mass | 902 g |
| Standards | |
| Design & Construction | MIL-T-28800, type III |
| Reliability | MIL-T-28800, type III |
| Maintainability | MIL-T-28800, type III |
| Environmental | MIL-T-28800, type III, class 5, style E |
NSN 6625-01-420-1614
Measure Tech EL 7520