DXHC15-30 1D AC Helmholtz Coil: Quality Inspection Report
Overall Dimensions: 345mm x 233mm x 365mm
Coil spacing: 109mm
Inside diameter of coil: 250mm
Outside diameter of coil: 340mm
Weight: 10.67kg
| 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. |
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| 2. Basic information | |||||||
| Product Name: One-dimensional AC Helmholtz Coil |
Product model: | DXHC15-30 | |||||
| Test time: | Nov. 26th, 2025 | ||||||
| 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 |
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| 15.0℃ | 15.0℃ | - | 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 |
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| 2. Magnetic field measurement | |||||||
| This product uses the following measurement methods: Fixed-point measurement: measure the magnetic field at the target point |
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| Magnetic field strength | |||||||
| No. | Display current (A) | Display voltage Voltage (V) | Magnetic field strength（Gs） |
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| 1D AC Coil | 2 | 1.19 | 6.331 | ||||
| 4 | 2.38 | 12.667 | |||||
| 6 | 3.57 | 19.065 | |||||
| 8 | 4.76 | 25.415 | |||||
| 10 | 5.95 | 31.756 | |||||
| 10（3KHz） | 8.5 | 27 | |||||
| 8（3KHz） | 6.9 | 21.77 | |||||
| 6（3KHz） | 5.2 | 16.5 | |||||
| 4（3KHz） | 3.4 | 10.6 | |||||
| Note | The working time is better than 30 minutes | ||||||
| Table 2 Magnetic field strength data | |||||||
| Magnetic field uniformity | |||||||
| No. | Area | Current | Center | Max | Min | Uniformity | |
| 1 | Φ75mm | 10A | 31.756 | 31.813 | 31.648 | -0.3401% | |
| XYZ | Magnetic field strength(mT) | ||||||
| (0,0,0) | 31.756 | ||||||
| (37.5,0,0) | 31.737 | ||||||
| (-37.5,0,0) | 31.745 | ||||||
| (0,37.5,0) | 31.655 | ||||||
| (0,-37.5,0) | 31.813 | ||||||
| (0,0,37.5) | 31.648 | ||||||
| (0,0,-37.5) | 31.764 | ||||||
| Table 3 Uniformity data | |||||||
| Electrical parameter test | |||||||
| 1. Using equipment | |||||||
| Digital multimeter Impedance analyzer |
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| 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℃ | |||
| 15.0℃ | 15.0℃ | 0.550Ω | 0.563Ω | 0.731Ω | |||
| Table 4 Resistance R data | |||||||
| Inductance Ls, reactance Z measurement (test level 5V) | |||||||
| Ls MIN[H] | FREQ[Hz] | Ls MAX[H] | FREQ[Hz] | ||||
| 3.28242m | 3.00000k | 3.32241m | 20 | ||||
| Z MIN[Ω] | FREQ[Hz] | Z MAX[Ω] | FREQ[Hz] | ||||
| 0.687 | 20 | 61.8753 | 3.00000k | ||||
| 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 | 3.32241m | 0.687 | 102 | 1.52490k | 3.28349m | 31.4656 |
| 2 | 34.9 | 3.31313m | 0.91023 | 103 | 1.53980k | 3.28349m | 31.7729 |
| 3 | 49.8 | 3.31309m | 1.17174 | 104 | 1.55470k | 3.28346m | 32.08 |
| 4 | 64.7 | 3.30964m | 1.45359 | 105 | 1.56960k | 3.28342m | 32.3869 |
| 5 | 79.6 | 3.30839m | 1.74438 | 106 | 1.58450k | 3.28338m | 32.6939 |
| 6 | 94.5 | 3.30341m | 2.03814 | 107 | 1.59940k | 3.28338m | 33.0012 |
| 7 | 109.4 | 3.30227m | 2.33697 | 108 | 1.61430k | 3.28339m | 33.3087 |
| 8 | 124.3 | 3.30025m | 2.63702 | 109 | 1.62920k | 3.28333m | 33.6153 |
| 9 | 139.2 | 3.29681m | 2.93709 | 110 | 1.64410k | 3.28331m | 33.9225 |
| 10 | 154.1 | 3.29768m | 3.24163 | 111 | 1.65900k | 3.28330m | 34.2297 |
| 11 | 169 | 3.29645m | 3.54499 | 112 | 1.67390k | 3.28325m | 34.5366 |
| 12 | 183.9 | 3.29572m | 3.84946 | 113 | 1.68880k | 3.28325m | 34.8439 |
| 13 | 198.8 | 3.29439m | 4.15331 | 114 | 1.70370k | 3.28322m | 35.151 |
| 14 | 213.7 | 3.29439m | 4.45925 | 115 | 1.71860k | 3.28324m | 35.4585 |
| 15 | 228.6 | 3.29314m | 4.76373 | 116 | 1.73350k | 3.28323m | 35.7657 |
| 16 | 243.5 | 3.29310m | 5.06991 | 117 | 1.74840k | 3.28332m | 36.074 |
| 17 | 258.4 | 3.29263m | 5.37569 | 118 | 1.76330k | 3.28326m | 36.3807 |
| 18 | 273.3 | 3.29130m | 5.68018 | 119 | 1.77820k | 3.28318m | 36.6872 |
| 19 | 288.2 | 3.29125m | 5.98685 | 120 | 1.79310k | 3.28314m | 36.994 |
| 20 | 303.1 | 3.29067m | 6.29259 | 121 | 1.80800k | 3.28313m | 37.3012 |
| 21 | 318 | 3.29019m | 6.59857 | 122 | 1.82290k | 3.28310m | 37.6082 |
| 22 | 332.9 | 3.28976m | 6.90463 | 123 | 1.83780k | 3.28307m | 37.9151 |
| 23 | 347.8 | 3.29158m | 7.21573 | 124 | 1.85270k | 3.28314m | 38.2233 |
| 24 | 362.7 | 3.28935m | 7.51796 | 125 | 1.86760k | 3.28307m | 38.5298 |
| 25 | 377.6 | 3.28898m | 7.82409 | 126 | 1.88250k | 3.28307m | 38.8371 |
| 26 | 392.5 | 3.28863m | 8.13038 | 127 | 1.89740k | 3.28304m | 39.1441 |
| 27 | 407.4 | 3.28841m | 8.43704 | 128 | 1.91230k | 3.28299m | 39.4508 |
| 28 | 422.3 | 3.28819m | 8.74366 | 129 | 1.92720k | 3.28302m | 39.7585 |
| 29 | 437.2 | 3.28806m | 9.05056 | 130 | 1.94210k | 3.28302m | 40.0659 |
| 30 | 452.1 | 3.28774m | 9.3568 | 131 | 1.95700k | 3.28297m | 40.3726 |
| 31 | 467 | 3.28762m | 9.6638 | 132 | 1.97190k | 3.28296m | 40.6798 |
| 32 | 481.9 | 3.28727m | 9.97001 | 133 | 1.98680k | 3.28298m | 40.9873 |
| 33 | 496.8 | 3.28720m | 10.2771 | 134 | 2.00170k | 3.28294m | 41.2942 |
| 34 | 511.7 | 3.28688m | 10.5833 | 135 | 2.01660k | 3.28292m | 41.6013 |
| 35 | 526.6 | 3.28684m | 10.8905 | 136 | 2.03150k | 3.28293m | 41.9086 |
| 36 | 541.5 | 3.28630m | 11.196 | 137 | 2.04640k | 3.28290m | 42.2157 |
| 37 | 556.4 | 3.28666m | 11.5045 | 138 | 2.06130k | 3.28289m | 42.5228 |
| 38 | 571.3 | 3.28667m | 11.8119 | 139 | 2.07620k | 3.28290m | 42.8302 |
| 39 | 586.2 | 3.28629m | 12.1178 | 140 | 2.09110k | 3.28287m | 43.1371 |
| 40 | 601.1 | 3.28640m | 12.4256 | 141 | 2.10600k | 3.28288m | 43.4445 |
| 41 | 616 | 3.28618m | 12.7321 | 142 | 2.12090k | 3.28286m | 43.7516 |
| 42 | 630.9 | 3.28608m | 13.0391 | 143 | 2.13580k | 3.28285m | 44.0588 |
| 43 | 645.8 | 3.28580m | 13.3453 | 144 | 2.15070k | 3.28284m | 44.366 |
| 44 | 660.7 | 3.28589m | 13.653 | 145 | 2.16560k | 3.28283m | 44.6731 |
| 45 | 675.6 | 3.28573m | 13.9597 | 146 | 2.18050k | 3.28284m | 44.9806 |
| 46 | 690.5 | 3.28560m | 14.2665 | 147 | 2.19540k | 3.28278m | 45.2872 |
| 47 | 705.4 | 3.28547m | 14.5733 | 148 | 2.21030k | 3.28279m | 45.5946 |
| 48 | 720.3 | 3.28539m | 14.8803 | 149 | 2.22520k | 3.28278m | 45.9017 |
| 49 | 735.2 | 3.28517m | 15.1867 | 150 | 2.24010k | 3.28281m | 46.2094 |
| 50 | 750.1 | 3.28492m | 15.4929 | 151 | 2.25500k | 3.28279m | 46.5165 |
| 51 | 765 | 3.28521m | 15.8015 | 152 | 2.26990k | 3.28276m | 46.8234 |
| 52 | 779.9 | 3.28497m | 16.1077 | 153 | 2.28480k | 3.28274m | 47.1305 |
| 53 | 794.8 | 3.28483m | 16.4144 | 154 | 2.29970k | 3.28275m | 47.4379 |
| 54 | 809.7 | 3.28484m | 16.7218 | 155 | 2.31460k | 3.28275m | 47.7452 |
| 55 | 824.6 | 3.28473m | 17.0286 | 156 | 2.32950k | 3.28274m | 48.0523 |
| 56 | 839.5 | 3.28499m | 17.3373 | 157 | 2.34440k | 3.28272m | 48.3593 |
| 57 | 854.4 | 3.28459m | 17.6425 | 158 | 2.35930k | 3.28272m | 48.6667 |
| 58 | 869.3 | 3.28459m | 17.9499 | 159 | 2.37420k | 3.28271m | 48.9739 |
| 59 | 884.2 | 3.28458m | 18.2572 | 160 | 2.38910k | 3.28270m | 49.2809 |
| 60 | 899.1 | 3.28450m | 18.5641 | 161 | 2.40400k | 3.28271m | 49.5884 |
| 61 | 914 | 3.28441m | 18.8709 | 162 | 2.41890k | 3.28269m | 49.8953 |
| 62 | 928.9 | 3.28445m | 19.1785 | 163 | 2.43380k | 3.28267m | 50.2025 |
| 63 | 943.8 | 3.28431m | 19.485 | 164 | 2.44870k | 3.28270m | 50.5102 |
| 64 | 958.7 | 3.28434m | 19.7925 | 165 | 2.46360k | 3.28272m | 50.8178 |
| 65 | 973.6 | 3.28430m | 20.0996 | 166 | 2.47850k | 3.28268m | 51.1244 |
| 66 | 988.5 | 3.28432m | 20.4071 | 167 | 2.49340k | 3.28265m | 51.4313 |
| 67 | 1.00340k | 3.28429m | 20.7143 | 168 | 2.50830k | 3.28266m | 51.7387 |
| 68 | 1.01830k | 3.28414m | 21.0207 | 169 | 2.52320k | 3.28264m | 52.0457 |
| 69 | 1.03320k | 3.28411m | 21.3279 | 170 | 2.53810k | 3.28263m | 52.3529 |
| 70 | 1.04810k | 3.28376m | 21.6329 | 171 | 2.55300k | 3.28266m | 52.6607 |
| 71 | 1.06300k | 3.28409m | 21.9424 | 172 | 2.56790k | 3.28264m | 52.9677 |
| 72 | 1.07790k | 3.28398m | 22.249 | 173 | 2.58280k | 3.28261m | 53.2744 |
| 73 | 1.09280k | 3.28392m | 22.5559 | 174 | 2.59770k | 3.28260m | 53.5816 |
| 74 | 1.10770k | 3.28394m | 22.8634 | 175 | 2.61260k | 3.28259m | 53.8888 |
| 75 | 1.12260k | 3.28388m | 23.1703 | 176 | 2.62750k | 3.28255m | 54.1954 |
| 76 | 1.13750k | 3.28388m | 23.4777 | 177 | 2.64240k | 3.28254m | 54.5025 |
| 77 | 1.15240k | 3.28388m | 23.7851 | 178 | 2.65730k | 3.28252m | 54.8095 |
| 78 | 1.16730k | 3.28377m | 24.0916 | 179 | 2.67220k | 3.28253m | 55.1169 |
| 79 | 1.18220k | 3.28374m | 24.3987 | 180 | 2.68710k | 3.28253m | 55.4243 |
| 80 | 1.19710k | 3.28371m | 24.7058 | 181 | 2.70200k | 3.28256m | 55.7321 |
| 81 | 1.21200k | 3.28371m | 25.0132 | 182 | 2.71690k | 3.28256m | 56.0392 |
| 82 | 1.22690k | 3.28367m | 25.3202 | 183 | 2.73180k | 3.28254m | 56.3462 |
| 83 | 1.24180k | 3.28364m | 25.6273 | 184 | 2.74670k | 3.28253m | 56.6535 |
| 84 | 1.25670k | 3.28355m | 25.934 | 185 | 2.76160k | 3.28256m | 56.9613 |
| 85 | 1.27160k | 3.28356m | 26.2413 | 186 | 2.77650k | 3.28255m | 57.2684 |
| 86 | 1.28650k | 3.28350m | 26.5482 | 187 | 2.79140k | 3.28254m | 57.5755 |
| 87 | 1.30140k | 3.28352m | 26.8557 | 188 | 2.80630k | 3.28253m | 57.8826 |
| 88 | 1.31630k | 3.28347m | 27.1626 | 189 | 2.82120k | 3.28251m | 58.1895 |
| 89 | 1.33120k | 3.28344m | 27.4697 | 190 | 2.83610k | 3.28252m | 58.4969 |
| 90 | 1.34610k | 3.28338m | 27.7765 | 191 | 2.85100k | 3.28251m | 58.8041 |
| 91 | 1.36100k | 3.28337m | 28.0838 | 192 | 2.86590k | 3.28250m | 59.1113 |
| 92 | 1.37590k | 3.28335m | 28.3909 | 193 | 2.88080k | 3.28251m | 59.4186 |
| 93 | 1.39080k | 3.28332m | 28.698 | 194 | 2.89570k | 3.28249m | 59.7257 |
| 94 | 1.40570k | 3.28333m | 29.0054 | 195 | 2.91060k | 3.28248m | 60.0328 |
| 95 | 1.42060k | 3.28331m | 29.3125 | 196 | 2.92550k | 3.28248m | 60.34 |
| 96 | 1.43550k | 3.28327m | 29.6195 | 197 | 2.94040k | 3.28250m | 60.6476 |
| 97 | 1.45040k | 3.28326m | 29.9268 | 198 | 2.95530k | 3.28249m | 60.9548 |
| 98 | 1.46530k | 3.28324m | 30.2339 | 199 | 2.97020k | 3.28246m | 61.2616 |
| 99 | 1.48020k | 3.28320m | 30.5408 | 200 | 2.98510k | 3.28248m | 61.5691 |
| 100 | 1.49510k | 3.28320m | 30.8482 | 201 | 3.00000k | 3.28242m | 61.8753 |
| 101 | 1.51000k | 3.28318m | 31.1553 | ||||
| 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. | |||||||
