Overview
The Resistor 0.5 Ohm is a precision measuring resistor used in systems where controlled magnetic fields are generated. Installed in series between a power amplifier and a Helmholtz coil, it enables accurate indirect current measurement.
The voltage drop across the resistor is proportional to the current through the coil, allowing engineers to calculate current using standard measurement equipment. This makes it suitable for EMC testing such as MIL-STD-461 (CS101) and ISO 11452-10.
Its low-inductance design ensures reliable performance across a wide frequency range, with calibration data provided from DC to 200 kHz. It also serves as a protective load, helping stabilize the system and protect the amplifier, especially at low frequencies.
The EMC Shop customers use the Resistor 0.5 Ohm as a current sensing point in EMC test setups. It is placed in series with the amplifier and coil, while measurement equipment monitors the voltage across it.
Using the known resistance (0.5 Ω), engineers calculate the current and adjust the system to meet required test levels. At the same time, the resistor helps protect the amplifier by providing a stable resistive load.
