Quality Inspection Report: DXHC4.5-1 Uni-directional AC Helmholtz Coil

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Overall Dimensions: 180mm x 117mm x 115mm
Coil spacing: 19mm
Inside diameter of coil: 65mm
Outside diameter of coil: 100mm
Weight: 2.21kg

 

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:
AC Helmholtz coil
Product model: DXHC4.5-1
Test time: May.23, 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
20.0℃ 20.0℃ 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 0.5 - 5.84
0,0,0 0.67 0.36 7.826
0,0,0 1 0.54 11.618
(10,0,0) 1 - 11.461
(-10,0,0) 1 - 11.422
(0,10,0) 1 - 11.796
(0,-10,0) 1 - 11.986
(0,0,10) 1 - 11.462
Table 2 Magnetic field strength data
 
Magnetic field uniformity
No. Area Current Max Min Uniformity Note
1 Sφ20mm 1A 11.986Gs 11.422Gs 3.17%  
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℃
20.0℃ 20.0℃ 0.520Ω 0.520Ω 0.675Ω
Table 4 Resistance R data
 
Inductance Ls, reactance Z measurement (test level 5V)
Ls MIN[H] FREQ[Hz] Ls MAX[H] FREQ[Hz]
 1.90273m 147.4  1.90914m 29.8
Z  MIN[Ω] FREQ[Hz] Z  MAX[Ω] FREQ[Hz]
0.5834 20 11.9739  1.00000k
Table 5 inductance Ls and reactance Z data
 
Inductance Ls, reactance Z-scan measurement
POINTS FREQ[Hz] Ls POINTS FREQ[Hz] Ls
1 20  1.90615m 0.5834 102 514.9  1.90389m 6.18414
2 24.9  1.90389m 0.60973 103 519.8  1.90393m 6.24268
3 29.8  1.90914m 0.64113 104 524.7  1.90396m 6.30117
4 34.7  1.90721m 0.6752 105 529.6  1.90398m 6.35967
5 39.6  1.90772m 0.71305 106 534.5  1.90400m 6.41815
6 44.5  1.90670m 0.75302 107 539.4  1.90401m 6.47663
7 49.4  1.90509m 0.79541 108 544.3  1.90416m 6.53545
8 54.3  1.90630m 0.84021 109 549.2  1.90416m 6.59388
9 59.2  1.90727m 0.88668 110 554.1  1.90413m 6.65222
10 64.1  1.90628m 0.93409 111 559  1.90411m 6.7106
11 69  1.90624m 0.98286 112 563.9  1.90410m 6.76901
12 73.9  1.90607m 1.03269 113 568.8  1.90408m 6.82738
13 78.8  1.90540m 1.08311 114 573.7  1.90408m 6.88586
14 83.7  1.90438m 1.13411 115 578.6  1.90407m 6.94428
15 88.6  1.90314m 1.18557 116 583.5  1.90404m 7.00265
16 93.5  1.90321m 1.23829 117 588.4  1.90402m 7.06105
17 98.4  1.90521m 1.29255 118 593.3  1.90402m 7.1195
18 103.3  1.90515m 1.34622 119 598.2  1.90400m 7.17791
19 108.2  1.90509m 1.40025 120 603.1  1.90400m 7.23636
20 113.1  1.90506m 1.45469 121 608  1.90398m 7.2948
21 118  1.90505m 1.50951 122 612.9  1.90396m 7.35319
22 122.9  1.90499m 1.56452 123 617.8  1.90395m 7.41163
23 127.8  1.90470m 1.61957 124 622.7  1.90393m 7.47006
24 132.7  1.90438m 1.67484 125 627.6  1.90392m 7.52849
25 137.6  1.90393m 1.73015 126 632.5  1.90390m 7.58693
26 142.5  1.90323m 1.78544 127 637.4  1.90388m 7.64535
27 147.4  1.90273m 1.84104 128 642.3  1.90387m 7.70379
28 152.3  1.90284m 1.89732 129 647.2  1.90387m 7.76227
29 157.2  1.90343m 1.95424 130 652.1  1.90385m 7.82073
30 162.1  1.90379m 2.01108 131 657  1.90383m 7.87912
31 167  1.90396m 2.06794 132 661.9  1.90383m 7.93763
32 171.9  1.90442m 2.12503 133 666.8  1.90381m 7.99605
33 176.8  1.90443m 2.1819 134 671.7  1.90379m 8.05447
34 181.7  1.90444m 2.23888 135 676.6  1.90377m 8.11291
35 186.6  1.90449m 2.29597 136 681.5  1.90376m 8.17135
36 191.5  1.90450m 2.35308 137 686.4  1.90375m 8.22983
37 196.4  1.90451m 2.4103 138 691.3  1.90374m 8.2883
38 201.3  1.90452m 2.46758 139 696.2  1.90373m 8.34674
39 206.2  1.90451m 2.52487 140 701.1  1.90371m 8.40517
40 211.1  1.90446m 2.58219 141 706  1.90370m 8.46365
41 216  1.90443m 2.63958 142 710.9  1.90369m 8.52213
42 220.9  1.90437m 2.69699 143 715.8  1.90368m 8.5806
43 225.8  1.90427m 2.75435 144 720.7  1.90367m 8.63906
44 230.7  1.90410m 2.81168 145 725.6  1.90364m 8.69749
45 235.6  1.90385m 2.86893 146 730.5  1.90364m 8.756
46 240.5  1.90350m 2.92603 147 735.4  1.90363m 8.81447
47 245.4  1.90329m 2.98339 148 740.3  1.90362m 8.87293
48 250.3  1.90324m 3.04101 149 745.2  1.90360m 8.93139
49 255.2  1.90318m 3.09868 150 750.1  1.90360m 8.98988
50 260.1  1.90330m 3.15664 151 755  1.90359m 9.04837
51 265  1.90344m 3.2147 152 759.9  1.90358m 9.10684
52 269.9  1.90372m 3.27303 153 764.8  1.90357m 9.16533
53 274.8  1.90406m 3.33148 154 769.7  1.90355m 9.22379
54 279.7  1.90429m 3.3898 155 774.6  1.90354m 9.28224
55 284.6  1.90440m 3.44792 156 779.5  1.90353m 9.34074
56 289.5  1.90445m 3.50595 157 784.4  1.90352m 9.39923
57 294.4  1.90444m 3.56391 158 789.3  1.90352m 9.45774
58 299.3  1.90443m 3.62189 159 794.2  1.90351m 9.51624
59 304.2  1.90461m 3.68016 160 799.1  1.90350m 9.57474
60 309.1  1.90455m 3.73806 161 804  1.90347m 9.63311
61 314  1.90453m 3.79609 162 808.9  1.90346m 9.69158
62 318.9  1.90449m 3.85407 163 813.8  1.90345m 9.75009
63 323.8  1.90446m 3.91211 164 818.7  1.90344m 9.80858
64 328.7  1.90442m 3.97013 165 823.6  1.90344m 9.8671
65 333.6  1.90439m 4.0282 166 828.5  1.90339m 9.92544
66 338.5  1.90437m 4.08628 167 833.4  1.90340m 9.98403
67 343.4  1.90432m 4.14433 168 838.3  1.90341m 10.0426
68 348.3  1.90428m 4.20239 169 843.2  1.90340m 10.1011
69 353.2  1.90428m 4.26054 170 848.1  1.90343m 10.1598
70 358.1  1.90423m 4.31863 171 853  1.90343m 10.2183
71 363  1.90422m 4.37681 172 857.9  1.90342m 10.2769
72 367.9  1.90417m 4.43491 173 862.8  1.90344m 10.3355
73 372.8  1.90414m 4.49304 174 867.7  1.90343m 10.394
74 377.7  1.90411m 4.5512 175 872.6  1.90347m 10.4527
75 382.6  1.90407m 4.60935 176 877.5  1.90345m 10.5112
76 387.5  1.90404m 4.66752 177 882.4  1.90347m 10.5698
77 392.4  1.90400m 4.7257 178 887.3  1.90347m 10.6284
78 397.3  1.90397m 4.78389 179 892.2  1.90348m 10.687
79 402.2  1.90394m 4.84211 180 897.1  1.90349m 10.7456
80 407.1  1.90392m 4.90033 181 902  1.90350m 10.8042
81 412  1.90390m 4.95858 182 906.9  1.90349m 10.8626
82 416.9  1.90389m 5.01682 183 911.8  1.90349m 10.9212
83 421.8  1.90386m 5.07506 184 916.7  1.90350m 10.9798
84 426.7  1.90384m 5.1333 185 921.6  1.90349m 11.0383
85 431.6  1.90380m 5.19152 186 926.5  1.90348m 11.0968
86 436.5  1.90379m 5.2498 187 931.4  1.90349m 11.1554
87 441.4  1.90375m 5.30804 188 936.3  1.90348m 11.2139
88 446.3  1.90375m 5.36636 189 941.2  1.90348m 11.2724
89 451.2  1.90370m 5.42457 190 946.1  1.90348m 11.331
90 456.1  1.90367m 5.48284 191 951  1.90349m 11.3896
91 461  1.90363m 5.54107 192 955.9  1.90348m 11.4481
92 465.9  1.90359m 5.5993 193 960.8  1.90342m 11.5062
93 470.8  1.90357m 5.65761 194 965.7  1.90340m 11.5647
94 475.7  1.90357m 5.71597 195 970.6  1.90339m 11.6232
95 480.6  1.90359m 5.77442 196 975.5  1.90338m 11.6817
96 485.5  1.90356m 5.83271 197 980.4  1.90337m 11.7402
97 490.4  1.90362m 5.89127 198 985.3  1.90336m 11.7987
98 495.3  1.90363m 5.94969 199 990.2  1.90334m 11.8571
99 500.2  1.90373m 6.00842 200 995.1  1.90333m 11.9157
100 505.1  1.90377m 6.06693 201  1.00000k  1.90328m 11.9739
101 510  1.90382m 6.1255        
Table 6 Detailed frequency data of inductance Ls and reactance Z
 
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.