The magnetic, handheld coil FESP 5139 was designed to generate defined magnetic field strength in the frequency range from DC up to 5 (7) MHz. The main application is immunity testing against magnetic fields.
Depending on the current source char-acteristics magnetic fields up to 360 A/m can be generated for a short time. The generated magnetic fieldstrength is pro-portional to the coil current. A distance ring allows a precise spacing of 50 mm between coil and EUT surface. Other distance rings can be used to scale the current-fieldstrength ratio. The highest fieldstrength levels can be achieved using the shortest ring. There are further rings available on request in order to provide a certain scaling between coil current and magnetic fieldstrength (e.g. 1 A coil current = 20 A/m fieldstrength).
Application as Sensor for Magnetic Fields:
The FESP 5139 can also be used to measure existing magnetic fields. For this purpose the FESP 5139 is connected to a frequency selective 50 Ohm measuring instrument e.g. a spectrum analyzer or a measuring receiver.
| Number of turns: | 3 |
| Wire diameter: | 1 mm Cu |
| Maximum Coil Current: | 12 A (5 min.) |
| Nominal Coil Current: | 8 A continuous |
| Maximum magnetic Field Strength:(without distance ring, in coil center) | 360 A/m (5 min.) |
| Nominal Magnetic Field Strength with 50 mm distance ring: | 85 A/m continuous |
| Magnetic Fieldstrength, 1 A Coil Current: (with 50 mm distance ring) | 10.61 A/m |
| Current required for 1 A/m: (with 50 mm distance ring) | 94.25 mA |
| Medium coil diameter: | 100 mm |
| Spacing coil center to measurement plane: | 50 mm |
| Mechanical Dimensions: | 11 x 11 x 21 cm |
| Connector: | N-female |
| Usable Frequency Range: | 0 – 5 (7) MHz |
| Inductance: | 2.3 μH |
| Weight: | 0.47 kg |