DXBK15-100 Four Rings DC Helmholtz Coil: Quality Inspection Report

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Four Rings DC Helmholtz Coil 1 Four Rings DC Helmholtz Coil 2 Four Rings DC Helmholtz Coil 3

 

Overall Dimensions: 335mm x 350mm x 360mm
Coil spacing: 38/60mm
Inside diameter of coil: 226mm
Outside diameter of coil: 350mm
Weight: 38kg

 

Performance test report
 Introduction
    1. Test purpose
Through the analysis of the test results, the evaluation of the product performance is obtained;
Evaluate whether the test product meets the technical requirements;
Provide reference data for product design and after-sales service, and provide a strong basis for leaving the factory.
    2. Basic information
 Product Name:
Four Rings DC Helmholtz Coil		 Product model: DXBK15-100
Test time: Dec. 06, 2024
    3. Testing environment
The detection environment is closer to the actual environmental conditions used by the user, including factors such as lead wire length and ambient temperature. The time is selected in the time interval where the fluctuation of the geomagnetic field is small. Before the test, the instruments required for the test were turned on and warmed up in advance and the measurement environment was recorded, as shown in Table 1.
Measurement environment
Environment
temperature		 Product initial
temperature		 Lead length Environmental
magnetic field
14.0℃ 14.0℃ 3m 0~30000nT
Table 1 Measurement environment data
　
Magnetic field parameter test
    1. Using the device
DX-F2031 power supply
DX-180 Gauss Meter
DXACP Power Amplifier
    2. Magnetic field measurement
This product uses the following measurement methods:
Fixed-point measurement: measure the magnetic field at the target point
Magnetic field strength
No. Display current (A) Display voltage Voltage (V) Magnetic field
strength（Gs）
0，0，0 1 - 20.941
0，0，0 2 - 41.871
0，0，0 3 - 62.773
0，0，0 4 - 83.632
0，0，0 5 28.83 104.592
Table 2 Magnetic field strength data
 
Magnetic field uniformity
No. Area Current Max Min Uniformity Note
1 φ80*120mm 5A 105.098Gs 104.443Gs 0.48% 　
Table 3 Uniformity data
　
Electrical parameter test
    1. Using equipment
Digital multimeter
Impedance analyzer
    2. Test method
The digital instrument with bridge circuit and voltammetry is used for measurement. The measurement results are shown in the table below.
Resistance R measurement
Environment temp Product temperature Measuring resistance ResistanceR@20℃ ResistanceR@85℃
14.0℃ 14.0℃ 5.060Ω 5.204Ω 6.760Ω
Table 4 Resistance R data
　
Inductance Ls, reactance Z measurement (test level 5V)
Ls MIN[H] FREQ[Hz] Ls MAX[H] FREQ[Hz]
 19.5632m  1.00000k  45.1178m 20
Z  MIN[Ω] FREQ[Hz] Z  MAX[Ω] FREQ[Hz]
12.182 20 128.272  1.00000k
Table 5 inductance Ls and reactance Z data
　
Inductance Ls, reactance Z-scan measurement
POINTS FREQ[Hz] Ls Z  POINTS FREQ[Hz] Ls Z 
1 20  45.1178m 12.182 102 514.9  21.2693m 73.0683
2 24.9  40.1941m 12.8187 103 519.8  21.2439m 73.6493
3 29.8  37.0445m 13.4154 104 524.7  21.2187m 74.2293
4 34.7  34.8550m 13.9952 105 529.6  21.1937m 74.8088
5 39.6  33.2346m 14.5665 106 534.5  21.1688m 75.3872
6 44.5  31.9861m 15.136 107 539.4  21.1443m 75.9653
7 49.4  30.9861m 15.7037 108 544.3  21.1207m 76.5448
8 54.3  30.1734m 16.2735 109 549.2  21.0968m 77.1221
9 59.2  29.4876m 16.8432 110 554.1  21.0730m 77.6986
10 64.1  28.9070m 17.4145 111 559  21.0494m 78.2739
11 69  28.4054m 17.9881 112 563.9  21.0259m 78.8484
12 73.9  27.9694m 18.5653 113 568.8  21.0030m 79.4234
13 78.8  27.5864m 19.1454 114 573.7  20.9800m 79.997
14 83.7  27.2465m 19.7287 115 578.6  20.9573m 80.5704
15 88.6  26.9429m 20.3152 116 583.5  20.9347m 81.1427
16 93.5  26.6701m 20.9048 117 588.4  20.9124m 81.7147
17 98.4  26.4216m 21.495 118 593.3  20.8903m 82.286
18 103.3  26.1954m 22.0901 119 598.2  20.8683m 82.8567
19 108.2  25.9883m 22.6882 120 603.1  20.8466m 83.4271
20 113.1  25.7979m 23.2888 121 608  20.8251m 83.9968
21 118  25.6221m 23.8917 122 612.9  20.8038m 84.5661
22 122.9  25.4585m 24.4966 123 617.8  20.7824m 85.1342
23 127.8  25.3066m 25.104 124 622.7  20.7615m 85.7023
24 132.7  25.1646m 25.7131 125 627.6  20.7407m 86.2699
25 137.6  25.0318m 26.3241 126 632.5  20.7200m 86.8367
26 142.5  24.9067m 26.9366 127 637.4  20.6996m 87.4033
27 147.4  24.7885m 27.5501 128 642.3  20.6793m 87.9694
28 152.3  24.6767m 28.1651 129 647.2  20.6591m 88.5343
29 157.2  24.5705m 28.7808 130 652.1  20.6391m 89.0991
30 162.1  24.4694m 29.3976 131 657  20.6195m 89.6639
31 167  24.3731m 30.0154 132 661.9  20.5998m 90.2278
32 171.9  24.2793m 30.6324 133 666.8  20.5804m 90.7913
33 176.8  24.1913m 31.2518 134 671.7  20.5612m 91.3542
34 181.7  24.1094m 31.8748 135 676.6  20.5420m 91.9168
35 186.6  24.0287m 32.4953 136 681.5  20.5231m 92.4787
36 191.5  23.9508m 33.1162 137 686.4  20.5043m 93.0404
37 196.4  23.8759m 33.7375 138 691.3  20.4856m 93.6013
38 201.3  23.8037m 34.359 139 696.2  20.4671m 94.162
39 206.2  23.7338m 34.9808 140 701.1  20.4488m 94.7221
40 211.1  23.6663m 35.6027 141 706  20.4306m 95.282
41 216  23.6009m 36.2247 142 710.9  20.4127m 95.8419
42 220.9  23.5375m 36.8463 143 715.8  20.3948m 96.4007
43 225.8  23.4759m 37.468 144 720.7  20.3771m 96.9596
44 230.7  23.4162m 38.0896 145 725.6  20.3594m 97.5174
45 235.6  23.3579m 38.7107 146 730.5  20.3419m 98.075
46 240.5  23.3013m 39.3319 147 735.4  20.3248m 98.633
47 245.4  23.2459m 39.9525 148 740.3  20.3067m 99.1866
48 250.3  23.1921m 40.5731 149 745.2  20.2897m 99.743
49 255.2  23.1394m 41.193 150 750.1  20.2728m 100.299
50 260.1  23.0881m 41.8128 151 755  20.2561m 100.855
51 265  23.0378m 42.4319 152 759.9  20.2396m 101.411
52 269.9  22.9885m 43.0504 153 764.8  20.2230m 101.966
53 274.8  22.9403m 43.6687 154 769.7  20.2067m 102.521
54 279.7  22.8932m 44.2865 155 774.6  20.1905m 103.075
55 284.6  22.8468m 44.9035 156 779.5  20.1744m 103.63
56 289.5  22.8013m 45.5198 157 784.4  20.1584m 104.183
57 294.4  22.7565m 46.1355 158 789.3  20.1426m 104.737
58 299.3  22.7127m 46.7509 159 794.2  20.1269m 105.29
59 304.2  22.6689m 47.3652 160 799.1  20.1114m 105.843
60 309.1  22.6266m 47.9794 161 804  20.0958m 106.395
61 314  22.5849m 48.5926 162 808.9  20.0805m 106.947
62 318.9  22.5442m 49.2055 163 813.8  20.0653m 107.499
63 323.8  22.5039m 49.8175 164 818.7  20.0501m 108.05
64 328.7  22.4642m 50.4288 165 823.6  20.0351m 108.601
65 333.6  22.4252m 51.0395 166 828.5  20.0202m 109.152
66 338.5  22.3867m 51.6493 167 833.4  20.0054m 109.703
67 343.4  22.3488m 52.2583 168 838.3  19.9907m 110.253
68 348.3  22.3114m 52.8665 169 843.2  19.9763m 110.803
69 353.2  22.2746m 53.474 170 848.1  19.9617m 111.352
70 358.1  22.2382m 54.0807 171 853  19.9474m 111.902
71 363  22.2023m 54.6866 172 857.9  19.9332m 112.451
72 367.9  22.1669m 55.2917 173 862.8  19.9191m 112.999
73 372.8  22.1318m 55.8957 174 867.7  19.9051m 113.548
74 377.7  22.0973m 56.4992 175 872.6  19.8911m 114.096
75 382.6  22.0631m 57.1016 176 877.5  19.8774m 114.644
76 387.5  22.0295m 57.7036 177 882.4  19.8637m 115.192
77 392.4  21.9960m 58.3042 178 887.3  19.8501m 115.74
78 397.3  21.9630m 58.9042 179 892.2  19.8365m 116.287
79 402.2  21.9305m 59.5037 180 897.1  19.8232m 116.834
80 407.1  21.8984m 60.1024 181 902  19.8098m 117.381
81 412  21.8665m 60.7 182 906.9  19.7966m 117.928
82 416.9  21.8350m 61.2968 183 911.8  19.7835m 118.474
83 421.8  21.8037m 61.8924 184 916.7  19.7705m 119.02
84 426.7  21.7731m 62.4882 185 921.6  19.7576m 119.566
85 431.6  21.7426m 63.0824 186 926.5  19.7446m 120.111
86 436.5  21.7123m 63.6756 187 931.4  19.7320m 120.657
87 441.4  21.6825m 64.2685 188 936.3  19.7193m 121.202
88 446.3  21.6530m 64.8605 189 941.2  19.7068m 121.747
89 451.2  21.6238m 65.4518 190 946.1  19.6943m 122.292
90 456.1  21.5949m 66.0422 191 951  19.6820m 122.837
91 461  21.5662m 66.6317 192 955.9  19.6696m 123.38
92 465.9  21.5379m 67.2207 193 960.8  19.6584m 123.929
93 470.8  21.5099m 67.8089 194 965.7  19.6462m 124.473
94 475.7  21.4820m 68.396 195 970.6  19.6341m 125.016
95 480.6  21.4545m 68.9825 196 975.5  19.6221m 125.56
96 485.5  21.4273m 69.5684 197 980.4  19.6102m 126.102
97 490.4  21.4002m 70.1533 198 985.3  19.5983m 126.645
98 495.3  21.3734m 70.7373 199 990.2  19.5865m 127.188
99 500.2  21.3471m 71.3215 200 995.1  19.5749m 127.73
100 505.1  21.3210m 71.9046 201  1.00000k  19.5632m 128.272
101 510  21.2949m 72.4867 　 　 　 　
Table 6 Detailed frequency data of inductance Ls and reactance Z
               
    3.Temperature test
This product uses the following measurement methods:
a. Using magnetic field temperature rise measurement: given the limit working time and maximum temperature under the target magnetic field current required by the user.
b. Maximum current temperature rise measurement: Measure the ultimate working time and maximum temperature under the maximum safe current that the product can withstand
c. Measure the data on temperature, time and current of the entire coil. The measurement results are shown in the table below.
Temperature rise test
Current[A] Working time[min] Initial Temp[℃] End Temp[℃]
5 60 14 ＜85
The initial voltage is 28.86V, and the voltage is 31.25V
Table 7 Relationship data between temperature, working time and current
 
Conclusion
The magnetic field and electrical performance of the product meet the requirements of the corresponding technical parameters. The final performance of the product is subject to this document.

 

 

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Dexinmag® • 2025

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