DXHC11-50 1D Helmholtz Coil: Quality Inspection Report
Overall Dimensions: 298mm x 159mm x 273mm
Coil spacing: 78mm
Inside diameter of coil: 183mm
Outside diameter of coil: 248mm
Weight: 6.84kg
| 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 Helmholtz Coil |
Product model: | DXHC11-50 | |||||
| Test time: | September 24th, 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 |
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| 24.0℃ | 24.0℃ | 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 |
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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 | |||||||
| Measuring point | Display current (A) | Display voltage Voltage (V) | Magnetic field strength（Gs） |
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| 0，0，0 | 0.5 | 7.87 | 13.29 | ||||
| 0，0，0 | 1 | 15.79 | 26.645 | ||||
| 0，0，0 | 2 | 31.81 | 53.373 | ||||
| (25，0，0) | 1 | - | 26.645 | ||||
| (-25，0，0) | 1 | - | 26.583 | ||||
| (0，25，0) | 1 | - | 26.658 | ||||
| (0，-25，0) | 1 | - | 26.548 | ||||
| (0，0，25) | 1 | - | 26.591 | ||||
| (0，0，-25) | 1 | - | 26.613 | ||||
| Table 2 Magnetic field strength data | |||||||
| Magnetic field uniformity | |||||||
| No. | Area | Current | Max | Min | Uniformity | Note | |
| 1 | Sφ50mm | 1A | 26.658Gs | 26.548Gs | -0.36% | ||
| 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℃ | |||
| 24.0℃ | 24.0℃ | 15.770Ω | 15.485Ω | 20.115Ω | |||
| Table 4 Resistance R data | |||||||
| Inductance Ls, reactance Z measurement (test level 5V) | |||||||
| Ls MIN[H] | FREQ[Hz] | Ls MAX[H] | FREQ[Hz] | ||||
| 96.9628m | 323.8 | 97.1942m | 20 | ||||
| Z MIN[Ω] | FREQ[Hz] | Z MAX[Ω] | FREQ[Hz] | ||||
| 19.9981 | 20 | 609.768 | 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 | 97.1942m | 19.9981 | 102 | 514.9 | 96.9633m | 314.113 |
| 2 | 24.9 | 97.1668m | 21.9507 | 103 | 519.8 | 96.9636m | 317.095 |
| 3 | 29.8 | 97.1273m | 24.1149 | 104 | 524.7 | 96.9640m | 320.078 |
| 4 | 34.7 | 97.0996m | 26.4402 | 105 | 529.6 | 96.9645m | 323.062 |
| 5 | 39.6 | 97.0666m | 28.885 | 106 | 534.5 | 96.9643m | 326.043 |
| 6 | 44.5 | 97.0827m | 31.4338 | 107 | 539.4 | 96.9651m | 329.027 |
| 7 | 49.4 | 97.0829m | 34.0491 | 108 | 544.3 | 96.9649m | 332.009 |
| 8 | 54.3 | 97.0684m | 36.7168 | 109 | 549.2 | 96.9652m | 334.992 |
| 9 | 59.2 | 97.0660m | 39.4344 | 110 | 554.1 | 96.9659m | 337.976 |
| 10 | 64.1 | 97.0533m | 42.1846 | 111 | 559 | 96.9661m | 340.959 |
| 11 | 69 | 97.0505m | 44.9678 | 112 | 563.9 | 96.9663m | 343.942 |
| 12 | 73.9 | 97.0467m | 47.7746 | 113 | 568.8 | 96.9669m | 346.926 |
| 13 | 78.8 | 97.0392m | 50.5999 | 114 | 573.7 | 96.9670m | 349.909 |
| 14 | 83.7 | 97.0342m | 53.4431 | 115 | 578.6 | 96.9677m | 352.894 |
| 15 | 88.6 | 97.0292m | 56.3007 | 116 | 583.5 | 96.9682m | 355.878 |
| 16 | 93.5 | 97.0240m | 59.1705 | 117 | 588.4 | 96.9688m | 358.863 |
| 17 | 98.4 | 97.0188m | 62.0513 | 118 | 593.3 | 96.9693m | 361.848 |
| 18 | 103.3 | 97.0160m | 64.9421 | 119 | 598.2 | 96.9694m | 364.831 |
| 19 | 108.2 | 97.0125m | 67.8404 | 120 | 603.1 | 96.9697m | 367.815 |
| 20 | 113.1 | 97.0097m | 70.7461 | 121 | 608 | 96.9701m | 370.799 |
| 21 | 118 | 97.0059m | 73.6573 | 122 | 612.9 | 96.9706m | 373.784 |
| 22 | 122.9 | 97.0031m | 76.5747 | 123 | 617.8 | 96.9707m | 376.767 |
| 23 | 127.8 | 97.0008m | 79.4974 | 124 | 622.7 | 96.9710m | 379.751 |
| 24 | 132.7 | 96.9982m | 82.4241 | 125 | 627.6 | 96.9712m | 382.735 |
| 25 | 137.6 | 96.9956m | 85.3548 | 126 | 632.5 | 96.9715m | 385.719 |
| 26 | 142.5 | 96.9931m | 88.289 | 127 | 637.4 | 96.9719m | 388.704 |
| 27 | 147.4 | 96.9904m | 91.2262 | 128 | 642.3 | 96.9726m | 391.69 |
| 28 | 152.3 | 96.9896m | 94.1679 | 129 | 647.2 | 96.9723m | 394.672 |
| 29 | 157.2 | 96.9881m | 97.1113 | 130 | 652.1 | 96.9727m | 397.657 |
| 30 | 162.1 | 96.9873m | 100.057 | 131 | 657 | 96.9734m | 400.643 |
| 31 | 167 | 96.9857m | 103.005 | 132 | 661.9 | 96.9736m | 403.627 |
| 32 | 171.9 | 96.9853m | 105.956 | 133 | 666.8 | 96.9738m | 406.611 |
| 33 | 176.8 | 96.9837m | 108.907 | 134 | 671.7 | 96.9739m | 409.595 |
| 34 | 181.7 | 96.9820m | 111.861 | 135 | 676.6 | 96.9741m | 412.579 |
| 35 | 186.6 | 96.9806m | 114.816 | 136 | 681.5 | 96.9752m | 415.567 |
| 36 | 191.5 | 96.9790m | 117.772 | 137 | 686.4 | 96.9754m | 418.552 |
| 37 | 196.4 | 96.9773m | 120.729 | 138 | 691.3 | 96.9756m | 421.536 |
| 38 | 201.3 | 96.9760m | 123.688 | 139 | 696.2 | 96.9763m | 424.523 |
| 39 | 206.2 | 96.9750m | 126.648 | 140 | 701.1 | 96.9767m | 427.508 |
| 40 | 211.1 | 96.9736m | 129.609 | 141 | 706 | 96.9768m | 430.492 |
| 41 | 216 | 96.9729m | 132.572 | 142 | 710.9 | 96.9771m | 433.478 |
| 42 | 220.9 | 96.9715m | 135.535 | 143 | 715.8 | 96.9773m | 436.462 |
| 43 | 225.8 | 96.9707m | 138.499 | 144 | 720.7 | 96.9779m | 439.449 |
| 44 | 230.7 | 96.9702m | 141.465 | 145 | 725.6 | 96.9779m | 442.433 |
| 45 | 235.6 | 96.9699m | 144.432 | 146 | 730.5 | 96.9788m | 445.421 |
| 46 | 240.5 | 96.9684m | 147.397 | 147 | 735.4 | 96.9783m | 448.403 |
| 47 | 245.4 | 96.9679m | 150.365 | 148 | 740.3 | 96.9791m | 451.39 |
| 48 | 250.3 | 96.9670m | 153.332 | 149 | 745.2 | 96.9800m | 454.379 |
| 49 | 255.2 | 96.9675m | 156.303 | 150 | 750.1 | 96.9804m | 457.364 |
| 50 | 260.1 | 96.9685m | 159.275 | 151 | 755 | 96.9805m | 460.349 |
| 51 | 265 | 96.9679m | 162.245 | 152 | 759.9 | 96.9813m | 463.337 |
| 52 | 269.9 | 96.9672m | 165.215 | 153 | 764.8 | 96.9812m | 466.321 |
| 53 | 274.8 | 96.9676m | 168.188 | 154 | 769.7 | 96.9818m | 469.308 |
| 54 | 279.7 | 96.9668m | 171.159 | 155 | 774.6 | 96.9819m | 472.293 |
| 55 | 284.6 | 96.9669m | 174.132 | 156 | 779.5 | 96.9826m | 475.28 |
| 56 | 289.5 | 96.9669m | 177.105 | 157 | 784.4 | 96.9834m | 478.268 |
| 57 | 294.4 | 96.9663m | 180.077 | 158 | 789.3 | 96.9835m | 481.253 |
| 58 | 299.3 | 96.9662m | 183.051 | 159 | 794.2 | 96.9843m | 484.242 |
| 59 | 304.2 | 96.9632m | 186.02 | 160 | 799.1 | 96.9847m | 487.228 |
| 60 | 309.1 | 96.9630m | 188.994 | 161 | 804 | 96.9854m | 490.216 |
| 61 | 314 | 96.9634m | 191.97 | 162 | 808.9 | 96.9860m | 493.203 |
| 62 | 318.9 | 96.9631m | 194.945 | 163 | 813.8 | 96.9862m | 496.189 |
| 63 | 323.8 | 96.9628m | 197.92 | 164 | 818.7 | 96.9869m | 499.177 |
| 64 | 328.7 | 96.9633m | 200.896 | 165 | 823.6 | 96.9874m | 502.165 |
| 65 | 333.6 | 96.9628m | 203.872 | 166 | 828.5 | 96.9884m | 505.154 |
| 66 | 338.5 | 96.9630m | 206.849 | 167 | 833.4 | 96.9889m | 508.141 |
| 67 | 343.4 | 96.9628m | 209.825 | 168 | 838.3 | 96.9896m | 511.13 |
| 68 | 348.3 | 96.9630m | 212.802 | 169 | 843.2 | 96.9898m | 514.116 |
| 69 | 353.2 | 96.9629m | 215.779 | 170 | 848.1 | 96.9895m | 517.099 |
| 70 | 358.1 | 96.9636m | 218.758 | 171 | 853 | 96.9911m | 520.092 |
| 71 | 363 | 96.9635m | 221.735 | 172 | 857.9 | 96.9917m | 523.08 |
| 72 | 367.9 | 96.9639m | 224.714 | 173 | 862.8 | 96.9920m | 526.067 |
| 73 | 372.8 | 96.9639m | 227.692 | 174 | 867.7 | 96.9929m | 529.056 |
| 74 | 377.7 | 96.9644m | 230.671 | 175 | 872.6 | 96.9933m | 532.043 |
| 75 | 382.6 | 96.9646m | 233.65 | 176 | 877.5 | 96.9938m | 535.031 |
| 76 | 387.5 | 96.9647m | 236.629 | 177 | 882.4 | 96.9945m | 538.02 |
| 77 | 392.4 | 96.9651m | 239.609 | 178 | 887.3 | 96.9949m | 541.007 |
| 78 | 397.3 | 96.9652m | 242.588 | 179 | 892.2 | 96.9955m | 543.996 |
| 79 | 402.2 | 96.9657m | 245.568 | 180 | 897.1 | 96.9964m | 546.986 |
| 80 | 407.1 | 96.9658m | 248.547 | 181 | 902 | 96.9969m | 549.974 |
| 81 | 412 | 96.9663m | 251.528 | 182 | 906.9 | 96.9978m | 552.964 |
| 82 | 416.9 | 96.9663m | 254.508 | 183 | 911.8 | 96.9988m | 555.955 |
| 83 | 421.8 | 96.9665m | 257.488 | 184 | 916.7 | 96.9989m | 558.941 |
| 84 | 426.7 | 96.9666m | 260.468 | 185 | 921.6 | 96.9996m | 561.93 |
| 85 | 431.6 | 96.9665m | 263.447 | 186 | 926.5 | 97.0005m | 564.921 |
| 86 | 436.5 | 96.9667m | 266.428 | 187 | 931.4 | 97.0011m | 567.909 |
| 87 | 441.4 | 96.9666m | 269.408 | 188 | 936.3 | 97.0023m | 570.902 |
| 88 | 446.3 | 96.9662m | 272.387 | 189 | 941.2 | 97.0024m | 573.888 |
| 89 | 451.2 | 96.9673m | 275.371 | 190 | 946.1 | 97.0032m | 576.878 |
| 90 | 456.1 | 96.9676m | 278.352 | 191 | 951 | 97.0032m | 579.863 |
| 91 | 461 | 96.9678m | 281.333 | 192 | 955.9 | 97.0048m | 582.858 |
| 92 | 465.9 | 96.9679m | 284.314 | 193 | 960.8 | 97.0060m | 585.851 |
| 93 | 470.8 | 96.9676m | 287.294 | 194 | 965.7 | 97.0067m | 588.841 |
| 94 | 475.7 | 96.9681m | 290.277 | 195 | 970.6 | 97.0074m | 591.831 |
| 95 | 480.6 | 96.9680m | 293.258 | 196 | 975.5 | 97.0084m | 594.823 |
| 96 | 485.5 | 96.9688m | 296.241 | 197 | 980.4 | 97.0090m | 597.812 |
| 97 | 490.4 | 96.9691m | 299.223 | 198 | 985.3 | 97.0097m | 600.802 |
| 98 | 495.3 | 96.9691m | 302.205 | 199 | 990.2 | 97.0106m | 603.793 |
| 99 | 500.2 | 96.9687m | 305.185 | 200 | 995.1 | 97.0114m | 606.784 |
| 100 | 505.1 | 96.9690m | 308.167 | 201 | 1.00000k | 97.0111m | 609.768 |
| 101 | 510 | 96.9686m | 311.148 | ||||
| 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[℃] | ||||
| 1 | 25 | 20 | ＜85 | ||||
| The voltage was 16.35V after 25 minutes | |||||||
| 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. | |||||||
