Custom Alternating Electromagnet(5T/m gradient): Quality Inspection Report

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Custom Alternating Electromagnet(5T/m gradient) P1 Custom Alternating Electromagnet(5T/m gradient) P2 Custom Alternating Electromagnet(5T/m gradient) P3 Custom Alternating Electromagnet(5T/m gradient) P4

 

Overall Dimensions: 270mm(L) x 200mm(W) x 445mm(H)
Weight: 28kg

 

 

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:
Alternating electromagnet		 Product model: Custom
Test time: 20260916-355
    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
24.0℃ 24.0℃ - 0~30000nT
Table 1 Measurement environment data
Magnetic field parameter test
    1. Using the device
DX-F2031 power supply
DX-180 Gauss Meter
    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 (V) Magnetic field
strength（Gs）
Upper coil assembly 5 1.51 175.397
10 3.02 349.58
15 4.54 523.99
20 6.05 698.29
25 7.59 872.92
30 9.15 1047.22
35 10.71 1221.39
40 12.29 1395.42
Lower coil assembly 5 1.58 178.054
10 3.17 355.23
15 4.75 532.55
20 6.34 709.93
25 7.94 887.17
30 9.55 1064.38
35 11.18 1241.51
40 12.87 1419.19
Note Air gap between upper and lower pole faces: 50 mm; measurement point located 25 mm above the center of the lower pole tip.
Table 2 Magnetic field strength data

 

Simulation of magnetic field gradient
　
Note The figure above shows the simulated gradient magnetic field curves when two power amplifiers drive the upper and lower coil assemblies with a 20 Hz sine wave. The phase of the lower coil assembly lags that of the upper coil assembly by 90°. The peak output voltage of the amplifiers is 40 Vp. In the figure, the horizontal axis represents time (in ms), and the vertical axis represents gradient magnetic field strength (in T/m).
The simulation begins at 0.94624 ms. At 18.50 ms, the gradient magnetic field amplitude reaches its maximum of approximately 4.4 T/m. At this moment, the current in the upper coil assembly is approximately 32 Ap, and the current in the lower coil assembly is approximately 23 Ap.
Therefore, to simulate the moment of maximum magnetic field gradient at 20 Hz, the actual measurement of the magnetic field gradient utilizes DC excitation of 32 A for the upper coil assembly and 23 A for the lower coil assembly.
Measured: Magnetic field gradient
Measurement Area Measured Current 　
Axis ±6mm

Upper coil: 32A;

Lower coil: 23A
Coordinates Magnetic field strength (Gs) Point-by-point gradient (T/m)
6 575.41 4.634
5 525.26 4.557
4 480.19 4.570
3 436.53 4.638
2 391.63 4.712
1 345.17 4.777
0 297.4 -
-1 251.302 -4.610
-2 210.91 -4.325
-3 168.138 -4.309
-4 121.718 -4.392
-5 73.327 -4.481
-6 35.186 -4.370
Table 3 Magnetic field gradient 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
No. Product temperature Measuring resistance ResistanceR@20℃ ResistanceR@85℃
Upper coil assembly 24.0℃ 0.280Ω 0.275Ω 0.357Ω
Lower coil assembly 24.0℃ 0.293Ω 0.288Ω 0.374Ω
Table 4 Resistance R data

 

Upper coil assembly: Inductance Ls, reactance Z measurement (test level 5V)
Ls MIN[H] FREQ[Hz] Ls MAX[H] FREQ[Hz]
 4.48681m  1.00000k  7.29096m 20
Z  MIN[Ω] FREQ[Hz] Z  MAX[Ω] FREQ[Hz]
1.38999 20 28.407  1.00000k
Table 5 Upper coil assembly inductance Ls and reactance Z data
　
Upper coil assembly Inductance Ls, reactance Z-scan measurement
POINTS FREQ[Hz] Ls Z  POINTS FREQ[Hz] Ls Z 
1 20  7.29096m 1.38999 102 514.9  4.54277m 14.812
2 24.9  6.44656m 1.48848 103 519.8  4.54228m 14.9507
3 29.8  5.93086m 1.58125 104 524.7  4.54176m 15.0892
4 34.7  5.59796m 1.67617 105 529.6  4.54130m 15.2279
5 39.6  5.36978m 1.77053 106 534.5  4.54070m 15.3661
6 44.5  5.20983m 1.86966 107 539.4  4.54025m 15.5048
7 49.4  5.09274m 1.97271 108 544.3  4.53946m 15.6422
8 54.3  5.00541m 2.07947 109 549.2  4.53902m 15.781
9 59.2  4.93860m 2.18959 110 554.1  4.53856m 15.9196
10 64.1  4.88519m 2.30258 111 559  4.53798m 16.0579
11 69  4.84208m 2.41827 112 563.9  4.53748m 16.1963
12 73.9  4.80705m 2.53637 113 568.8  4.53699m 16.3348
13 78.8  4.77771m 2.65632 114 573.7  4.53652m 16.4734
14 83.7  4.75338m 2.77807 115 578.6  4.53597m 16.6116
15 88.6  4.73320m 2.90175 116 583.5  4.53544m 16.7499
16 93.5  4.71597m 3.02688 117 588.4  4.53492m 16.8882
17 98.4  4.70113m 3.15273 118 593.3  4.53443m 17.0267
18 103.3  4.68853m 3.28019 119 598.2  4.53394m 17.165
19 108.2  4.67731m 3.4087 120 603.1  4.53341m 17.3032
20 113.1  4.66755m 3.53823 121 608  4.53291m 17.4416
21 118  4.65900m 3.66854 122 612.9  4.53242m 17.58
22 122.9  4.65095m 3.79905 123 617.8  4.53194m 17.7183
23 127.8  4.64412m 3.93053 124 622.7  4.53142m 17.8565
24 132.7  4.63747m 4.06221 125 627.6  4.53089m 17.9946
25 137.6  4.63170m 4.19469 126 632.5  4.53037m 18.1328
26 142.5  4.62655m 4.32772 127 637.4  4.52988m 18.271
27 147.4  4.62124m 4.46064 128 642.3  4.52937m 18.4092
28 152.3  4.61750m 4.59505 129 647.2  4.52885m 18.5473
29 157.2  4.61401m 4.7297 130 652.1  4.52833m 18.6854
30 162.1  4.61052m 4.86441 131 657  4.52777m 18.8232
31 167  4.60759m 4.9997 132 661.9  4.52730m 18.9615
32 171.9  4.60481m 5.13479 133 666.8  4.52677m 19.0995
33 176.8  4.60224m 5.2706 134 671.7  4.52628m 19.2376
34 181.7  4.59984m 5.40659 135 676.6  4.52574m 19.3755
35 186.6  4.59749m 5.54264 136 681.5  4.52517m 19.5132
36 191.5  4.59557m 5.6793 137 686.4  4.52467m 19.6513
37 196.4  4.59337m 5.8156 138 691.3  4.52415m 19.7892
38 201.3  4.59163m 5.9525 139 696.2  4.52364m 19.9271
39 206.2  4.58986m 6.08932 140 701.1  4.52311m 20.0649
40 211.1  4.58808m 6.22617 141 706  4.52256m 20.2026
41 216  4.58642m 6.36318 142 710.9  4.52204m 20.3404
42 220.9  4.58500m 6.50054 143 715.8  4.52151m 20.4782
43 225.8  4.58368m 6.63808 144 720.7  4.52092m 20.6156
44 230.7  4.58242m 6.77574 145 725.6  4.52043m 20.7535
45 235.6  4.58117m 6.91338 146 730.5  4.51990m 20.8912
46 240.5  4.57987m 7.05096 147 735.4  4.51934m 21.0288
47 245.4  4.57882m 7.18897 148 740.3  4.51880m 21.1663
48 250.3  4.57777m 7.32688 149 745.2  4.51823m 21.3038
49 255.2  4.57663m 7.46482 150 750.1  4.51774m 21.4415
50 260.1  4.57567m 7.60296 151 755  4.51709m 21.5786
51 265  4.57463m 7.74101 152 759.9  4.51660m 21.7163
52 269.9  4.57357m 7.87899 153 764.8  4.51609m 21.854
53 274.8  4.57259m 8.01711 154 769.7  4.51547m 21.991
54 279.7  4.57176m 8.15552 155 774.6  4.51493m 22.1285
55 284.6  4.57084m 8.29374 156 779.5  4.51441m 22.266
56 289.5  4.57008m 8.43225 157 784.4  4.51383m 22.4032
57 294.4  4.56905m 8.57026 158 789.3  4.51318m 22.54
58 299.3  4.56831m 8.70883 159 794.2  4.51274m 22.6778
59 304.2  4.56753m 8.84705 160 799.1  4.51210m 22.8146
60 309.1  4.56665m 8.9853 161 804  4.51158m 22.9521
61 314  4.56587m 9.12375 162 808.9  4.51092m 23.0887
62 318.9  4.56521m 9.26245 163 813.8  4.51043m 23.2263
63 323.8  4.56443m 9.40088 164 818.7  4.50983m 23.3632
64 328.7  4.56369m 9.5394 165 823.6  4.50925m 23.5002
65 333.6  4.56305m 9.67812 166 828.5  4.50864m 23.637
66 338.5  4.56231m 9.81663 167 833.4  4.50803m 23.7739
67 343.4  4.56148m 9.95481 168 838.3  4.50751m 23.9111
68 348.3  4.56076m 10.0933 169 843.2  4.50690m 24.0479
69 353.2  4.56013m 10.232 170 848.1  4.50630m 24.1846
70 358.1  4.55951m 10.3707 171 853  4.50565m 24.321
71 363  4.55889m 10.5095 172 857.9  4.50515m 24.4584
72 367.9  4.55828m 10.6482 173 862.8  4.50449m 24.5947
73 372.8  4.55772m 10.7871 174 867.7  4.50395m 24.7318
74 377.7  4.55716m 10.9259 175 872.6  4.50338m 24.8686
75 382.6  4.55645m 11.0644 176 877.5  4.50276m 25.0051
76 387.5  4.55591m 11.2032 177 882.4  4.50213m 25.1415
77 392.4  4.55536m 11.342 178 887.3  4.50153m 25.2781
78 397.3  4.55481m 11.4809 179 892.2  4.50088m 25.4144
79 402.2  4.55434m 11.6199 180 897.1  4.50033m 25.5511
80 407.1  4.55380m 11.7588 181 902  4.49965m 25.6872
81 412  4.55314m 11.8973 182 906.9  4.49906m 25.8237
82 416.9  4.55264m 12.0362 183 911.8  4.49845m 25.9601
83 421.8  4.55211m 12.175 184 916.7  4.49784m 26.0965
84 426.7  4.55170m 12.3142 185 921.6  4.49719m 26.2325
85 431.6  4.55114m 12.4529 186 926.5  4.49656m 26.3688
86 436.5  4.55060m 12.5916 187 931.4  4.49588m 26.5046
87 441.4  4.55015m 12.7307 188 936.3  4.49531m 26.6411
88 446.3  4.54964m 12.8694 189 941.2  4.49468m 26.7772
89 451.2  4.54910m 13.0081 190 946.1  4.49399m 26.9129
90 456.1  4.54858m 13.1469 191 951  4.49340m 27.0492
91 461  4.54809m 13.2857 192 955.9  4.49276m 27.1852
92 465.9  4.54760m 13.4245 193 960.8  4.49195m 27.3205
93 470.8  4.54713m 13.5633 194 965.7  4.49129m 27.4563
94 475.7  4.54658m 13.702 195 970.6  4.49070m 27.5925
95 480.6  4.54627m 13.8412 196 975.5  4.49004m 27.7282
96 485.5  4.54574m 13.9799 197 980.4  4.48938m 27.864
97 490.4  4.54514m 14.1183 198 985.3  4.48877m 27.9999
98 495.3  4.54471m 14.2572 199 990.2  4.48814m 28.1358
99 500.2  4.54420m 14.3958 200 995.1  4.48745m 28.2713
100 505.1  4.54374m 14.5346 201  1.00000k  4.48681m 28.407
101 510  4.54325m 14.6733 　 　 　 　
Table 6 Upper coil assembly Detailed frequency data of inductance Ls and reactance Z

 

Lower coil assembly Inductance Ls, reactance Z measurement (test level 5V)
Ls MIN[H] FREQ[Hz] Ls MAX[H] FREQ[Hz]
 18.7987m  1.00000k  19.5033m 20
Z  MIN[Ω] FREQ[Hz] Z  MAX[Ω] FREQ[Hz]
2.48664 20 118.398  1.00000k
Table 7 Lower coil assembly inductance Ls and reactance Z data
Lower coil assembly Inductance Ls, reactance Z-scan measurement
POINTS FREQ[Hz] Ls Z  POINTS FREQ[Hz] Ls Z 
1 20  19.5033m 2.48664 102 514.9  19.1575m 62.047
2 24.9  19.4836m 3.07984 103 519.8  19.1547m 62.6289
3 29.8  19.4688m 3.67474 104 524.7  19.1514m 63.2093
4 34.7  19.4552m 4.26979 105 529.6  19.1485m 63.7906
5 39.6  19.4420m 4.86613 106 534.5  19.1453m 64.3707
6 44.5  19.4308m 5.4618 107 539.4  19.1426m 64.9523
7 49.4  19.4369m 6.06421 108 544.3  19.1402m 65.5347
8 54.3  19.4268m 6.65963 109 549.2  19.1370m 66.1143
9 59.2  19.4256m 7.25683 110 554.1  19.1343m 66.6955
10 64.1  19.4179m 7.85076 111 559  19.1311m 67.2748
11 69  19.4062m 8.44098 112 563.9  19.1281m 67.8547
12 73.9  19.4123m 9.04064 113 568.8  19.1251m 68.4342
13 78.8  19.4049m 9.63358 114 573.7  19.1218m 69.0128
14 83.7  19.3954m 10.2241 115 578.6  19.1183m 69.5903
15 88.6  19.3913m 10.8189 116 583.5  19.1152m 70.1689
16 93.5  19.3937m 11.4158 117 588.4  19.1122m 70.7481
17 98.4  19.3845m 12.0073 118 593.3  19.1085m 71.3244
18 103.3  19.3781m 12.5995 119 598.2  19.1057m 71.9036
19 108.2  19.3757m 13.1943 120 603.1  19.1022m 72.4802
20 113.1  19.3764m 13.7917 121 608  19.0990m 73.0575
21 118  19.3713m 14.3837 122 612.9  19.0956m 73.6342
22 122.9  19.3717m 14.9809 123 617.8  19.0922m 74.2105
23 127.8  19.3621m 15.5704 124 622.7  19.0889m 74.7872
24 132.7  19.3624m 16.1657 125 627.6  19.0857m 75.3639
25 137.6  19.3590m 16.7584 126 632.5  19.0823m 75.9396
26 142.5  19.3570m 17.3517 127 637.4  19.0788m 76.515
27 147.4  19.3533m 17.944 128 642.3  19.0758m 77.0918
28 152.3  19.3526m 18.5384 129 647.2  19.0721m 77.6661
29 157.2  19.3489m 19.1305 130 652.1  19.0690m 78.2421
30 162.1  19.3462m 19.7233 131 657  19.0652m 78.8153
31 167  19.3443m 20.3169 132 661.9  19.0620m 79.3908
32 171.9  19.3399m 20.9078 133 666.8  19.0585m 79.9651
33 176.8  19.3366m 21.4995 134 671.7  19.0549m 80.5386
34 181.7  19.3345m 22.0927 135 676.6  19.0514m 81.1121
35 186.6  19.3307m 22.6836 136 681.5  19.0480m 81.6861
36 191.5  19.3317m 23.2802 137 686.4  19.0445m 82.2591
37 196.4  19.3262m 23.8687 138 691.3  19.0411m 82.8324
38 201.3  19.3246m 24.4619 139 696.2  19.0375m 83.4047
39 206.2  19.3220m 25.0537 140 701.1  19.0339m 83.9772
40 211.1  19.3187m 25.6446 141 706  19.0302m 84.5489
41 216  19.3170m 26.2373 142 710.9  19.0270m 85.1223
42 220.9  19.3148m 26.8296 143 715.8  19.0233m 85.6932
43 225.8  19.3122m 27.4206 144 720.7  19.0197m 86.2647
44 230.7  19.3098m 28.0119 145 725.6  19.0161m 86.836
45 235.6  19.3079m 28.6038 146 730.5  19.0124m 87.4069
46 240.5  19.3054m 29.1951 147 735.4  19.0089m 87.978
47 245.4  19.3033m 29.7865 148 740.3  19.0053m 88.5486
48 250.3  19.2998m 30.3758 149 745.2  19.0013m 89.1167
49 255.2  19.2984m 30.9683 150 750.1  18.9979m 89.6884
50 260.1  19.2977m 31.5618 151 755  18.9940m 90.2568
51 265  19.2953m 32.1522 152 759.9  18.9907m 90.828
52 269.9  19.2930m 32.7428 153 764.8  18.9869m 91.3966
53 274.8  19.2904m 33.3328 154 769.7  18.9832m 91.9658
54 279.7  19.2874m 33.9223 155 774.6  18.9793m 92.5331
55 284.6  19.2847m 34.5116 156 779.5  18.9759m 93.1031
56 289.5  19.2821m 35.1013 157 784.4  18.9722m 93.6713
57 294.4  19.2794m 35.6904 158 789.3  18.9683m 94.2384
58 299.3  19.2772m 36.2801 159 794.2  18.9645m 94.8057
59 304.2  19.2744m 36.8688 160 799.1  18.9607m 95.3724
60 309.1  19.2726m 37.4594 161 804  18.9569m 95.9396
61 314  19.2695m 38.0472 162 808.9  18.9533m 96.5071
62 318.9  19.2673m 38.6367 163 813.8  18.9495m 97.0735
63 323.8  19.2656m 39.2271 164 818.7  18.9458m 97.6405
64 328.7  19.2628m 39.8151 165 823.6  18.9419m 98.2058
65 333.6  19.2598m 40.4027 166 828.5  18.9382m 98.7721
66 338.5  19.2569m 40.9904 167 833.4  18.9339m 99.3357
67 343.4  19.2547m 41.5789 168 838.3  18.9300m 99.9005
68 348.3  19.2526m 42.1676 169 843.2  18.9260m 100.464
69 353.2  19.2502m 42.7561 170 848.1  18.9223m 101.03
70 358.1  19.2476m 43.3434 171 853  18.9186m 101.595
71 363  19.2448m 43.9304 172 857.9  18.9146m 102.159
72 367.9  19.2423m 44.5181 173 862.8  18.9106m 102.722
73 372.8  19.2395m 45.1045 174 867.7  18.9068m 103.286
74 377.7  19.2368m 45.6911 175 872.6  18.9028m 103.848
75 382.6  19.2346m 46.2789 176 877.5  18.8991m 104.413
76 387.5  19.2316m 46.8644 177 882.4  18.8952m 104.975
77 392.4  19.2292m 47.4515 178 887.3  18.8915m 105.539
78 397.3  19.2262m 48.0367 179 892.2  18.8873m 106.1
79 402.2  19.2241m 48.6242 180 897.1  18.8833m 106.662
80 407.1  19.2216m 49.2107 181 902  18.8794m 107.224
81 412  19.2181m 49.7945 182 906.9  18.8753m 107.784
82 416.9  19.2160m 50.3813 183 911.8  18.8716m 108.347
83 421.8  19.2129m 50.9657 184 916.7  18.8676m 108.908
84 426.7  19.2099m 51.5501 185 921.6  18.8638m 109.47
85 431.6  19.2077m 52.1364 186 926.5  18.8596m 110.029
86 436.5  19.2044m 52.7199 187 931.4  18.8557m 110.589
87 441.4  19.2018m 53.305 188 936.3  18.8517m 111.149
88 446.3  19.1988m 53.8888 189 941.2  18.8478m 111.709
89 451.2  19.1962m 54.4735 190 946.1  18.8438m 112.268
90 456.1  19.1931m 55.0567 191 951  18.8397m 112.826
91 461  19.1901m 55.6399 192 955.9  18.8358m 113.386
92 465.9  19.1876m 56.2245 193 960.8  18.8312m 113.941
93 470.8  19.1843m 56.8067 194 965.7  18.8273m 114.5
94 475.7  19.1815m 57.3903 195 970.6  18.8232m 115.057
95 480.6  19.1786m 57.9732 196 975.5  18.8193m 115.615
96 485.5  19.1757m 58.5557 197 980.4  18.8151m 116.172
97 490.4  19.1726m 59.1377 198 985.3  18.8110m 116.729
98 495.3  19.1698m 59.7205 199 990.2  18.8069m 117.286
99 500.2  19.1665m 60.3017 200 995.1  18.8028m 117.842
100 505.1  19.1639m 60.8849 201  1.00000k  18.7987m 118.398
101 510  19.1609m 61.4664 　 　 　 　
Table 10 Lower coil assembly Detailed frequency data of inductance Ls and reactance Z

 

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Dexinmag® • 2026

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