Helmholtz Coils
Helmholtz-Coils are especially designed to generate precisely defined magnetic fields from DC to the upper end of the audio frequency range and beyond. The generated fields are in a strongly linear relation to the coil current. The field- strength can be calculated exactly by analytical (or numerical) methods, based on the coils' geometry, the number of turns and the coil current.
Therefore Helmholtz-Coils are ideally suited for the calibration of magnetic field probes or sensors. Typical applications are magnetic immunity testing according to automotive standards or MIL-461F.
When generating magnetic fields with Helmholtz coils the coil current is directly proportional to the magnetic field strength.
HHS 5201-6 - Circular Helmholtz Coils
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Number of turns: |
6 |
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Maximum Coil Current: |
40 A (1 min.)
15 A (15 min.) |
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Nominal Coil Current: |
12 A continuous |
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Coil Spacings (centered): |
50 ... 80 mm |
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The following data refers to a coil separation of 60 mm |
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Max. Magn. Field Strength: |
2860 A/m (1 min.) |
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Nominal Magn. Field Strength: |
860 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
71.55 A/m
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Coil Diameter: |
120 mm |
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Mechanical Dimensions: |
290 x 220 x 130 mm |
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Terminals: |
4 mm female |
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Inductance (Single Coil): |
8 µH |
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Inductance (Coil Pair): |
18.7 µH / 50 mm
18.2 µH / 60 mm
17.9 µH / 70 mm
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Usable Frequency Range: |
DC - 5 MHz |
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Resonance Frequency: |
> 8 MHz |
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Weight:
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2.8 kg
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HHS 5201-98 - Circular Helmholtz Coils
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Number of turns: |
98 |
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Maximum Coil Current: |
40 A (1 min.)
15 A (15 min.) |
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Nominal Coil Current: |
12 A continuous |
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Coil Spacings (centered): |
approx. 29 ... 95 mm |
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Max. Magn. Field Strength: |
64 kA/m (1 min.) |
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Nominal Magn. Field Strength: |
20 kA/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
1598 A/m
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Conversion Current-Fieldstrength: |
64.07 dB/m
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Coil Diameter: |
84 mm (58-110 mm) |
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Free Coil Distance for DuT: |
0 ... 66 mm |
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Mechanical Dimensions: |
240 x 240 x 130 mm |
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Terminals: |
4 mm female |
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Inductance (Single Coil): |
0.84 mH |
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Inductance (Coil Pair): |
2.3 mH / 30 mm
2.0 mH / 50 mm
1.8 mH / 90 mm
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Usable Frequency Range: |
DC - 200 kHz |
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Resonance Frequency: |
> 600 kHz |
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Weight:
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4.1 kg
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HHS 5202-9 - Circular Helmholtz Coils
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Number of turns: |
9 |
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Maximum Coil Current: |
55 A (5 min.) |
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Nominal Coil Current: |
33 A continuous |
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Coil Spacings (centered): |
116 mm / 132 mm |
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The following data refers to a coil separation of 116 mm |
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Max. Magn. Field Strength: |
3053 A/m (5 min.) |
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Nominal Magn. Field Strength: |
1832 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
55.52 A/m
154.89 dBµA/m
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Coil Diameter: |
232 mm |
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Mechanical Dimensions: |
0.20 m x 0.25 m x 0.39 m |
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Max. cubical shaped DuT: |
11.3 cm x 11.3 cm x 11.3 cm |
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Terminals: |
4 mm female jacks
7 mm screw terminals |
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Inductance (Single Coil): |
36 µH |
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Inductance (Coil Pair): |
80 µH
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Usable Frequency Range: |
DC - 2.5 MHz |
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Resonance Frequency: |
> 3.5 MHz |
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Weight:
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4.9 kg
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HHS 5202-81 - Circular Helmholtz Coils
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Number of turns: |
81 |
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Maximum Coil Current: |
6 A (5 min.) |
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Nominal Coil Current: |
5 A continuous |
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Coil Spacings (centered): |
116 mm / 132 mm |
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The following data refers to a coil separation of 116 mm |
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Max. Magn. Field Strength: |
3000 A/m (5 min.) |
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Nominal Magn. Field Strength: |
2000 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
500A/m
174 dBµA/m
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Coil Diameter: |
232 mm |
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Mechanical Dimensions: |
0.20 m x 0.25 m x 0.39 m |
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Max. cubical shaped DuT: |
11.3 cm x 11.3 cm x 11.3 cm |
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Terminals: |
4 mm female
7 mm screw terminals |
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Inductance (Single Coil): |
2.83 mH |
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Inductance (Coil Pair): |
6.42 mH
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Usable Frequency Range: |
DC - 300 kHz |
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Resonance Frequency: |
> 400 kHz |
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Weight:
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4.7 kg
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HHS 5204-12 - Circular Helmholtz Coils
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Number of turns: |
12 |
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Maximum Coil Current: |
60 A (5 min.) |
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Nominal Coil Current: |
30 A continuous |
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Coil Spacings: |
200 mm, 250 mm, 300 mm |
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The following data corresponds to a coil spacing of 200 mm |
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Max. Magn. Field Strength: |
2500 A/m (5 min.) |
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Nominal Magn. Field Strength: |
1288 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
42.93 A/m
152.66 dBµA/m
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Conversion Current->Fieldstrength:
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32.66 dB/m |
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Coil Diameter: |
400 mm |
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Mechanical Dimensions: |
0.38 m x 0.58 m x 0.42 m |
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Terminals: |
4 mm female |
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Inductance (Single Coil): |
1.20 µH |
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Inductance (Coil Pair): |
2.40 - 2.60 µH |
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Usable Frequency Range: |
DC - 500 kHz |
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Resonance Frequency: |
>1.4 MHz |
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Weight:
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10.2 kg
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HHS 5204-36 - Circular Helmholtz Coils
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Number of turns: |
36 |
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Maximum Coil Current: |
20 A (5 min.) |
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Nominal Coil Current: |
10 A continuous |
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Coil Spacings: |
200 mm, 250 mm, 300 mm |
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The following data corresponds to a coil spacing of 200 mm |
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Max. Magn. Field Strength: |
2500 A/m (5 min.) |
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Nominal Magn. Field Strength: |
1288 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
128.8 A/m
162.2 dBµA/m
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Conversion Current->Fieldstrength:
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42.2 dB/m |
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Coil Diameter: |
400 mm |
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Mechanical Dimensions: |
0.38 m x 0.58 m x 0.42 m |
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Terminals: |
4 mm female |
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Inductance (Single Coil): |
1.15 mH |
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Inductance (Coil Pair): |
2.56 mH |
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Usable Frequency Range: |
DC - 150 kHz |
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Resonance Frequency: |
>200 kHz |
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Weight:
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8.5 kg
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HHS 5206-8 - Circular Helmholtz Coils
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Number of turns: |
8 |
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Maximum Coil Current: |
55 A (5 min.) |
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Nominal Coil Current: |
34 A continuous |
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Coil Spacings (centered): |
300 mm |
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Max. Magn. Field Strength: |
1060 A/m (5 min.) |
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Nominal Magn. Field Strength: |
650 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
19.23 A/m
145.68 dBµA/m
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Coil Diameter: |
600 mm |
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Max. Cubical shaped DuT: |
32.5 x 32.5 x 32.5 cm |
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Mechanical Dimensions: |
0.64 m x 0.79 m x 0.42 m |
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Terminals: |
4 mm female |
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Inductance (Single Coil): |
91 µH |
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Inductance (Coil Pair): |
200 µH |
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Usable Frequency Range: |
DC - 800 kHz |
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Resonance Frequency: |
> 1500 kHz |
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Weight:
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17.0 kg
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Recommended accessories:
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NFCN 9732 85 kHz
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Recommended accessories:
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NFCN 9732 85 kHz - Compensation Network
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The compensation network NFCN 9732 85 kHz consists of a high current/ high voltage variable capacitor.
The compensation capacitor reduces the total impedance of the series circuitry consisting of the Helmholtz coil HHS 5206-8 and the NFCN 9732 85 kHz at the operating frequency band of 80-90 kHz. It allows continuous currents of up to 15 Arms at generator voltages of less than 40 Vrms.
Application: Immunity test induktive changing 85 kHz
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HHS 5206-16 - Circular Helmholtz Coils
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Number of turns: |
16 |
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Maximum Coil Current: |
55 A (5 min.) |
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Nominal Coil Current: |
33 A continuous |
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Coil Spacings (centered): |
300 mm |
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Max. Magn. Field Strength: |
2100 A/m (5 min.) |
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Nominal Magn. Field Strength: |
1260 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
38.17 A/m
151.63 dBµA/m
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Coil Diameter: |
600 mm |
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Max. Cubical shaped DuT: |
32.5 x 32.5 x 32.5 cm |
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Mechanical Dimensions: |
0.64 m x 0.79 m x 0.42 m |
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Terminals: |
4 mm female |
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Inductance (Single Coil): |
340 µH |
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Inductance (Coil Pair): |
750 µH |
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Usable Frequency Range: |
DC - 500 kHz |
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Resonance Frequency: |
> 700 kHz |
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Weight:
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20.4 kg
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HHS 5206-132 - Circular Helmholtz Coils
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Number of turns: |
132 |
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Maximum Coil Current: |
15 A (5 min.) |
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Nominal Coil Current: |
10 A continuous |
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Coil Spacings (centered): |
300 mm |
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Max. Magn. Field Strength: |
4713 A/m (5 min.) |
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Nominal Magn. Field Strength: |
3142 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
314.2 A/m
169.97 dBµA/m
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Coil Diameter: |
600 mm |
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Max. Cubical shaped DuT: |
32.5 x 32.5 x 32.5 cm |
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Mechanical Dimensions: |
0.64 m x 0.79 m x 0.42 m |
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Terminals: |
4 mm banana jacks
screw terminals
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Inductance (Single Coil): |
22.4 mH |
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Inductance (Coil Pair): |
49.9 mH |
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Usable Frequency Range: |
DC - 30 kHz |
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Resonance Frequency: |
> 50 kHz |
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Weight:
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27.5 kg
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HHS 5210-10 - Helmholtz Coils
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Number of turns: |
10 |
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Maximum Coil Current: |
20 A (5 min.) |
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Nominal Coil Current: |
10 A continuous |
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Max. Magn. Field Strength: |
300 A/m (5 min.) |
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Nominal Magn. Field Strength: |
150 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
15 A/m (Coil Dist. 0.4 m)
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Mechanical Dimensions: |
1.0 x 1.0 x 0.63 m |
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Coil Separation acc. IEC 1000-4-8: |
0.40 m |
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Coil Separation for best uniformity: |
0.57 m |
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Terminals: |
4 mm female |
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Inductance (per Coil): |
0.36 mH |
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Usable Frequency Range: |
DC - 150 kHz |
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Resonance Frequency: |
> 600 kHz |
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Weight:
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10 kg
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HHS 5210-100 - Helmholtz Coils
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Number of turns: |
100 |
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Maximum Coil Current: |
15 A (5 min.) |
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Nominal Coil Current: |
9 A continuous |
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Inner side length of the coil: |
1.0 m |
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Electrical side length of the coil: |
1.04 m |
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Maximum Coil Separation: |
0.70 m |
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Usable Frequency Range: |
DC - 10 kHz |
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Inductance (per Coil): |
31.3 mH |
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Resonance Frequency (Pair of Coils): |
>25 kHz |
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Weight: |
36.5 kg |
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Terminals: |
4 mm female |
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The following data is valid for 0.4 m coil distance: |
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Coil Separation acc. IEC 1000-4-8: |
0.40 m |
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Max. Magn. Field Strength: |
2183 A/m (5 min.) |
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Nominal Magn. Field Strength: |
1310 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
145.54 A/m (Coil Dist. 0.4 m)
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The following data is valid for 0.566 m coil distance: |
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Coil Separation for best uniformity along an axes through the coil center: |
0.566 m |
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Magn. Field Strength, 1 A Coil Current: |
124.66 A/m (Coil Dist. 0.566 m) |
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Recommended Accessories: |
NFCN 9732-120 |
Recommended Accessories:
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NFCN 9732-120 - Compensation Network
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The compensation network NFCN 9732-120 consists of a capacitor and a fuse in series. It is used for a series compensation of the HHS 5210-100 at energetical mains frequencies of 50 Hz to 60 Hz.
The compensation capacitor reduces the total impedance of the series circuitry consisting of the Helmholtz coils HHS 5210-100 and the NFCN 9732-120 at the operating frequencies of 50 to 60 Hz. It allows continuous currents of up to 8 A rms at generator voltages of less than 70 Vrms ...80 Vrms .
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HHS 5210-100 2.5 - Helmholtz Coils
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Number of turns: |
100 |
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Maximum Coil Current: |
20 A (5 min.) |
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Nominal Coil Current: |
15 A continuous |
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Inner side length of the coil: |
1.0 m |
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Electrical side length of the coil: |
1.04 m |
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Maximum Coil Separation: |
0.70 m |
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Usable Frequency Range: |
DC - 10 kHz |
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Inductance (per Coil): |
31.3 mH |
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Resonance Frequency (Pair of Coils): |
>25 kHz |
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Weight: |
56 kg |
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Terminals: |
4 mm female |
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The following data is valid for 0.4 m coil distance: |
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Coil Separation acc. IEC 1000-4-8: |
0.40 m |
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Max. Magn. Field Strength: |
2900 A/m (5 min.) |
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Nominal Magn. Field Strength: |
1746 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
145.54 A/m (Coil Dist. 0.4 m)
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The following data is valid for 0.566 m coil distance: |
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Coil Separation for best uniformity along an axes through the coil center: |
0.566 m |
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Magn. Field Strength, 1 A Coil Current: |
124.66 A/m (Coil Dist. 0.566 m) |
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HHS 5212-10 - Helmholtz Coils
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Number of turns: |
10 |
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Maximum Coil Current: |
20 A (5 min.) |
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Nominal Coil Current: |
10 A continuous |
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Maximum Coil Separation: |
0.70 m |
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Usable Frequency Range: |
DC - 150 kHz |
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Inductance (per Coil): |
0.45 mH |
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Resonance Frequency (Pair of Coils): |
>500 kHz |
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Weight: |
12 kg |
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Terminals: |
4 mm female |
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Coil Separation acc. IEC 1000-4-8: |
0.48 m |
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Coil Separation for best uniformity: |
0.68 m |
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Max. Magn. Field Strength: |
250 A/m (5 min.) |
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Nominal Magn. Field Strength: |
125 A/m continuous |
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Magn. Field Strength, 1 A Coil Current: |
12.45 A/m (Coil Dist. 0.48 m)
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HHS 5213-50 - Helmholtz Coils
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Number of turns: |
50 |
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Maximum Coil Current: |
8 A (5 min.) |
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Nominal Coil Current: |
5 A continuous |
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Max. Magn. Field Strength: |
390 A/m (5 min.) |
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Nominal Magn. Field Strength: |
240 A/m continuos |
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Magn. Field Strength, 1 A Coil Current: |
48.5 A/m (coil Dist. 0.75 m) |
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Coil Separation acc. IEC 1000-4-8: |
0.75 m |
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Maximum Coil Separation: |
0.82 m |
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Mechanical Dimensions: |
1.36 m x 1.36 m x 0.9 m |
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Usable Frequency Range: |
DC - 20 kHz |
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Inductance (per Coil): |
10.5 mH |
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Resonance Frequency (Pair of Coils): |
>30 kHz |
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Weight: |
18 kg |
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Terminals: |
4 mm female |
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HHS 5213-100 - Helmholtz Coils
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Number of turns: |
100 |
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Maximum Coil Current: |
15 A (5 min.) |
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Nominal Coil Current: |
9 A continuous |
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Nominal Magn. Field Strength: |
900.9 A/m continuos |
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Magn. Field Strength, 1 A Coil Current: |
100.096 A/m (coil Dist. 0.705 m) |
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Maximum Coil Separation: |
0.83 m |
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Mechanical Dimensions: |
1.46 m x 1.36 m x 0.91 m |
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Usable Frequency Range: |
DC - 5 kHz |
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Inductance (Coil pair): |
88.3 mH (Coil Dist. 0.705 m) |
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Resonance Frequency (Pair of Coils): |
>13 kHz |
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Weight: |
44.5 kg |
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Terminals: |
4 mm female |
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HHS 5215-10 - Helmholtz Coils
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Number of turns: |
10 |
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Maximum Coil Current: |
20 A (5 min.) |
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Nominal Coil Current: |
10 A continuous |
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Max. Magn. Field Strength: |
200 A/m (5 min.) |
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Nominal Magn. Field Strength: |
100 A/m continuos |
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Magn. Field Strength, 1 A Coil Current: |
9.96 A/m (coil Dist. 0.6 m) |
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Coil Separation acc. IEC 1000-4-8: |
0.6 m |
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Maximum Coil Separation: |
0.86 m |
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Mechanical Dimensions: |
1.5 m x 1.5 m x 0.9 m |
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Usable Frequency Range: |
DC - 100 kHz |
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Inductance (Coil pair): |
1.3 mH |
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Resonance Frequency (Pair of Coils): |
>400 kHz |
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Weight: |
14 kg |
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Terminals: |
4 mm female |
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HHS 5215-100 - Helmholtz Coils
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Number of turns: |
100 |
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Maximum Coil Current: |
20 A (5 min.) |
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Nominal Coil Current: |
10 A continuous |
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Max. Magn. Field Strength: |
2000 A/m (max. 5 min., dist. 0.84 m*) |
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Nominal Magn. Field Strength: |
842 A/m continuos |
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Magn. Field Strength, 1 A Coil Current: |
84.2 A/m (coil dist. 0.84 m*) |
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Maximum Coil Separation: |
0.93 m* |
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Mechanical Dimensions: |
1.69 m x 1.60 m x 1.00 m |
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Usable Frequency Range: |
DC - 6 kHz |
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Inductance (Coil pair): |
112 mH |
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Resonance Frequency (Pair of Coils): |
>20 kHz |
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Weight: |
53 kg |
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Terminals: |
4 mm female |
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HHS 5218 - Helmholtz Coils
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Number of turns: |
10 |
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Maximum Coil Current: |
20 A (5 min.) |
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Nominal Coil Current: |
10 A continuous |
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Max. Magn. Field Strength: |
126 A/m (5 min.) |
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Nominal Magn. Field Strength: |
63 A/m continuos |
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Magn. Field Strength, 1 A Coil Current: |
6.26 A/m (coil Dist. 1.2 m) |
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Coil Separation acc. IEC 1000-4-8: |
0.72 m |
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Maximum Coil Separation: |
1.25 m |
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Coil Separation for best uniformity: |
1.20 m |
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Mechanical Dimensions: |
1.8 m x 1.8 m x 1.2 m |
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Usable Frequency Range: |
DC - 100 kHz |
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Resonance Frequency (Pair of Coils): |
>400 kHz |
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Weight: |
17 kg |
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Terminals: |
4 mm female |
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HHS 5230-100 - Helmholtz Coils
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The Helmholtz-Coil HHS 5230-100 are especially designed to generate precisely defined magnetic fields from DC to ca. 5 kHz, e.g. according to SAE J551-17.
Typical applications are magnetic immunity testing to whole vehicles according to SAEJ551-17 (Vehicle Electromagnetic Immunity – Power Line Magnetic Fields).
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Number of turns: |
100 |
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Maximum Coil Current: |
16 A (5 min.) |
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Nominal Coil Current: |
8 A continuous |
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Max. Magn. Field Strength: |
650 A/m @ coil Dist. =1.8 m |
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Nominal Magn. Field Strength: |
325 A/m @ coil Dist. = 1.8 m |
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Magn. Field Strength, 1 A Coil Current: |
50.8 A/m (coil Dist. 1.13 m) |
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Maximum Coil Separation: |
>1.13 m |
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Coil Separation for best uniformity: |
1.8 m |
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Mechanical Dimensions: |
W:2.0 m x H:3.10 m x B:3.18 m |
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Ground Clearence: |
0.12 m |
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Usable Frequency Range: |
DC - 5 kHz |
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Resonance Frequency (per Coil): |
>10 kHz, typ. 13 kHz |
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Weight (per Coil): |
190 kg |
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Recommended Accessories: |
NFCN 9731-100 |
Recommended Accessories:
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NFCN 9731-100 - Compensation Network
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The primary function of the compensation network NFCN 9731-100 is to provide a serial compensation of the inductance of i.e. the HHS 5230-100 at operation frequencies of 16.666 Hz, 50 Hz, 60 Hz, 150 Hz und 180 Hz. These operation frequencies are stipulated by SAE J551 - 17 (Vehicle Electromagnetic Immunity – Power Line Magnetic Fields).
The compensation capacitor reduces th e overall impedance of the series circuit consisting of the Helmholtz coil HHS 5230-100 and the compensation network NFCN 9731-100 at the applied operating frequency and allows currents up to 8 Arms at a generator voltage of less than 60 Vrms.
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