Product Catalog: 
Magnetic Field Coil
Product Detail: 
Helmholtz Coil
Introduction of Helmholtz Coil:
Hermann von Helmholtz (18211894) Helmholtz Coils a = radius of the coils 

What creates a magnetic field? The strength of magnetic field is measured at a point in space (often called the field point). In the case of the Helmholtz coils, the field points of interest are located in the midplane between the two coils. As shown in the equation above, the strength of the magnetic field is dependent upon three quantities: the current I, The total current in each coil is NI. 
How uniform is the magnetic field? 
Coil spacing is "too close." d = 0.8 a 

In the figures to the right, we can see how uniform the magnetic field is on the midplane when the spacing d is too close, just right, and too far. The figures to the right are calculated for coils with a radius of 20 cm (i.e., a = 0.20 m). The following integral was evaluated to produce the three curves at the right. 
Coil spacing is "just right." d = a 


Coil spacing is "too far." d = 1.2 a 
How does the region of uniform magnetic filed vary with the radius of the Helmholtz coils?
The figures below show the range of uniform magnetic field as a function of the coil radius.
Here is a lab writeup describing the procedure for measuring the chargetomass ratio of an electron using the Helmholtz coils.
Using two same coils with equal radius and turns,arrange them to be coaxial and let their distance be equal to the radius of the coil,this called Helmholtz coil. It can be used to generate magnetic field from extremely weak magnetic to hundreds of Gauss.
Specifications:
Model 
Shape 
Averageradius (cm) 
Center magnetic field (Gs) 
Power (W) 
Weight (Kg) (one axis) 
DXHC1502 
Square 
150 
2 
540~620 
84 
DXHC 10010 
Square 
100 
10 
1200~1500 
180 
DXHC 1005 
Square 
100 
5 
600~800 
94 
DXHC 1002 
Square 
100 
2 
220~300 
58 
DXHC 7510 
Square 
75 
10 
700~900 
80 
DXHC755 
Square 
75 
5 
360~430 
53 
DXHC752 
Square 
75 
2 
150~180 
21 
DXHC6010 
Square 
60 
10 
500~600 
68 
DXHC602 
Square 
60 
2 
100~120 
14 
DXHC5020 
Square 
50 
20 
600~700 
61 
DXHC5010 
Square 
50 
10 
350~430 
47 
DXHC502 
Square 
50 
2 
70~90 
15 
DXHC4050 
Square 
40 
50 
1000 
98 
DXHC4010 
Square 
40 
10 
220~300 
30 
DXHC402 
Square 
40 
2 
45~60 
15 
DXMC30100 
Round 
30 
100 
800 
80 
DXMC3050 
Round 
30 
50 
500 
40 
DXMC3010 
Round 
30 
10 
100~200 
17 
DXMC302 
Round 
30 
2 
24~48 
8 
DXMC251000 
Round 
25 
1000 
5000 
500 
DXMC25500 
Round 
25 
500 
3000 
250 
DXMC25300 
Round 
25 
300 
1800 
150 
DXMC25200 
Round 
25 
200 
1200 
100 
DXMC25100 
Round 
25 
100 
600 
50 
DXMC2550 
Round 
25 
50 
300 
25 
DXMC2510 
Round 
25 
10 
60~90 
12 
DXMC252 
Round 
25 
2 
12~18 
8 
DXMC20500 
Round 
20 
500 
2000 
160 
DXMC20300 
Round 
20 
300 
1200 
96 
DXMC20200 
Round 
20 
200 
700 
64 
DXMC20100 
Round 
20 
100 
350 
32 
DXMC2050 
Round 
20 
50 
200 
16 
DXMC2010 
Round 
20 
10 
40~65 
8 
DXMC205 
Round 
20 
5 
20~32 
6 
DXMC202 
Round 
20 
2 
8~15 
5 
DXMC15300 
Round 
15 
300 
660 
54 
DXMC15200 
Round 
15 
200 
430 
36 
DXMC15100 
Round 
15 
100 
220 
18 
DXMC1550 
Round 
15 
50 
110 
9 
DXMC1510 
Round 
15 
10 
21~42 
6 
DXMC10200 
Round 
10 
200 
200 
20 
DXMC10100 
Round 
10 
100 
100 
15 
DXMC1050 
Round 
10 
50 
50 
8 
DXMC1010 
Round 
10 
10 
10~24 
6 
DXMC7100 
Round 
7 
100 
50 
7 
DXMC750 
Round 
7 
50 
24 
4 
DXMC710 
Round 
7 
512 
10 
2 
Note: the models in red color can be made into three axis coils.
Feature:
Open space, easy to use, magnetic field has a good linear relationship with current, magnetic field space has a very wide uniform area,which is suitable to generate onedimensional, twodimensional and threedimensional space composite magnetic field.
Application:
1.to generate standard magnetic field
2.calibration for Hall probes and various magnetometers
3.compensation for earth magnetic field
4.judgement for magnetic shielding effect
5. measurement and removement for space radiation magnetic field
6. for magnetic properties
7.study for biomagnetism
Note:
Magnetic field intensity: the value of the magnetic field in the magnetic field center,when power is maximum
Uniform area: the relatively homogeneous magnetic field space surrounding magnetic field centre, or the required magnetic field for users’experiments
Space uniformity: the magnetic deviation degree in uniform area
Stability: the degree of change when the magnetic field working over a period of time.
Working time:the longest using time
Work period: the interval time between continuous work for more than two times
Our company specializes in the design and production of the Helmholtz coil, could put forward design scheme and proceed multidimensional space design according to the magnetic field strength, magnetic field homogeneity and uniformity level. With precise design, precise calculation and elaborate manufacture, our products have been chosen for the tertiary institutions, research units and the vast majority of users,received high reputation.