Circular Helmholtz coil HHS 5202-9 is ideally suited for the calibration of magnetic field probes or sensors. Due to the high temperature proof Teflon-coated wire packet it is possible to generate magnetic fields up to approx. 3000 A/m (for a short time).
Typical applications are magnetic immunity testing according to automotive standards or MIL-461. When generating magnetic fields with Helmholtz coils the coil current is directly proportional to the magnetic field strength.
The calibration of the magnetic field is finally traceable to a current measurement (or to a voltage drop at a known resistor).
The Helmholtz Coil itself is usually considered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop can be used to determine the actual field strength.
| Number of turns: | 9 |
| Maximum Coil Current: | 55 A (5 min.) |
| Nominal Coil Current: | 33 A continuous |
| Coil Spacings (centered): | 116 mm / 132 mm |
| The following data refers to a coil separation of 116 mm | |
| Max. Magn. Field Strength: | 3053 A/m (5 min.) |
| Nominal Magn. Field Strength: | 1832 A/m continuous |
| Magn. Field Strength, 1 A Coil Current: | 55.52 A/m; 154.89 dBµA/m |
| Coil Diameter: | 232 mm |
| Mechanical Dimensions: | 0.20 m x 0.25 m x 0.39 m |
| Max. cubical shaped DuT: | 11.3 cm x 11.3 cm x 11.3 cm |
| Terminals: | 4 mm female jacks, 7 mm screw terminals |
| Inductance (Single Coil): | 36 µH |
| Inductance (Coil Pair): | 80 µH |
| Usable Frequency Range: | DC – 2.5 MHz |
| Resonance Frequency: | > 3.5 MHz |
| Weight: | 4.9 kg |