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-461G.

When generating magnetic fields with Helmholtz coils the magnetic field strength is directly proportional to the coil current.

Helmholtz Coils Overview Table

					Coil Current, A		Magnetic Field Strength, A/m		Magnetic Field Strength at 1A Coil Current
Coil	Turns	Frequency Range	Type	Diameter / Side, m	Nominal	Max.	Nominal	Max.	A/m	dB/m	dBµA/m	Resonance Frequency, kHz
HHS 5218-100-2.5	100	DC - 3 kHz	Square	1.844	20	40	1721	3442	86.05	38.7	158.70	8
HHS 5203-536	536	DC - 2 kHz	Circular	0.256	5	15	14000	42000	2780	68.9	188.9	13
HHS 5206-25	25	DC - 300 kHz	Circular	0.6	28	46	1600	2700	59.64	35.5	155.51	400
HHS 5206-4	4	DC - 1.5 MHz	Circular	0.584	34	55	330	530	9.64	19.7	139.68	3000
HHS 5205-1	1	DC - 30 MHz	Circular	0.5	15	20	14.3	28.6	1.43	3.1	123.11	44000
HHS 3D 5213-50	50	DC - 20 kHz	Square	1.32	5	8	240	390	57.7	35.2	155.22	30
HHS 5206-8	8	DC - 800 kHz	Circular	0.6	34	55	650	1060	19.23	25.7	145.68	1500
HHS 5206-132	132	DC - 30 kHz	Circular	0.6	10	15	3142	4713	314.2	49.9	169.97	50
HHS 5202-81	81	DC - 300 kHz	Circular	0.232	4	6	2000	3000	500	54	174	400
HHS 5202-9	9	DC - 2.5 MHz	Circular	0.232	33	55	1832	3053	55.52	34.9	154.89	3500
HHS 5230-100	100	DC - 5 kHz	Square	3	8	16	325	650	50.8	34.1	154.12	13
HHS 5218	10	DC - 100 kHz	Square	1.8	10	20	63	126	6.26	15.9	135.93	400
HHS 5218-100	100	DC - 3 kHz	Square	1.833	10	20	706.3	1728	70.63	37	176.98	8
HHS 5215-100	100	DC - 6 kHz	Square	1.53	10	20	842	2000	84.2	38.5	158.51	20
HHS 5215-10	10	DC - 100 kHz	Square	1.5	10	20	100	200	9.96	20	140	400
HHS 5213-100	100	DC - 5 kHz	Square	1.295	9	15	900.9	1500	100.096	40	160	13
HHS 5213-50	50	DC - 20 kHz	Square	1.27	5	8	240	390	48.5	33.7	153.71	30
HHS 5212-10	10	DC - 150 kHz	Square	1.2	10	20	125	250	12.45	21.9	141.9	500
HHS 5210-100 2.5	100	DC - 10 kHz	Square	1.04	12	20	1746	2900	145.54	43.3	163.26	25
HHS 5210-100	100	DC - 10 kHz	Square	1.04	9	15	1310	2183	145.54	43.3	163.26	25
HHS 5210-10	10	DC - 150 kHz	Square	1	10	20	150	300	15	23.5	143.52	600
HHS 5201-6	6	DC - 5 MHz	Circular	0.12	12	40	860	2860	71.55	37.1	157.09	8000
HHS 5201-98	98	DC - 200 kHz	Circular	0.084	12	40	20000	64000	1598	64.1	184.07	600
HHS 5206-16	16	DC - 500 kHz	Circular	0.6	33	55	1260	2100	38.17	31.6	151.63	700
HHS 5204-12	12	DC - 500 kHz	Circular	0.4	30	60	1288	2500	42.93	32.7	152.66	1400
HHS 5204-36	36	DC - 150 kHz	Circular	0.4	10	20	1288	2500	128.8	42.2	162.2	200

Helmholtz Coils

HHS 5218-100-2.5 – Helmholtz Coil

Number of turns: 100
Frequency Range: DC - 3 kHz
Coil Shape: Square
Nominal Coil Current (continuous): 20 A
Maximum Coil Current (5 min.): 40 A
Magnetic Field Strength Nominal (continuos): 1721 A/m
Magnetic Field Strength Maximum (5 min.): 3442 A/m
Magnetic field strength at 1 A Coil Current: 86.05 A/m; 158.70 dBµA/m
Diameter/Side: 1.844 m
Resonance Frequency (pair of coils): 8 kHz