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Test head VDHH 9502

Brand:

SCHWARZBECK

Test head VDHH 9502
  • Product Description
  • Main features
  • Technical parameters
    • Commodity name: Test head VDHH 9502
    • Commodity ID: 1064821117547073536
    • 品牌11: SCHWARZBECK
    • 描述: Van der Hoofden test head VDHH 9502 for measuring the influence of lighting equipment on human exposure according to standards DIN IEC 62493:2015 and VDE 0848-493. Through the different coupling methods between the lighting equipment and the human body,
    • 品牌: SCHWARZBECK

      Van der Hoofden test head VDHH 9502 for measuring the influence of lighting equipment on human exposure according to standards DIN IEC 62493:2015 and VDE 0848-493. Through the different coupling methods between the lighting equipment and the human body, the radiation level of the human body exposed to the electromagnetic field can be deduced. Part of the radiation is based on capacitive coupling between the human body and the lighting device. This creates a current density, which can be measured and evaluated using an EMI receiver and Van der Hoofden test head.

  • Frequency range

    20 kHz – 10 MHz

    test output

    50 Ω ,BNC(f)

    ambient temperature

    -10°… +60°C

    Diameter of test sphere / head

    210 mm

    Diameter of rod clamp

    38 – 50 mm

    weight

    about 310g

      Measurement procedure:

      The Van der Hoofden test head consists of three parts: a conductive sphere with a diameter of 210 mm, a connecting cable 300 mm long, and a protective network for the EMI receiver.

      There is a 3/8" internal thread on the test head, which can be easily installed on a height-adjustable tripod. The protection network is fixed on the telescopic rod of the tripod by a mounting fixture, and connected to the test head through a 300mm cable. There are 4mm banana plugs, and the clamp with protective net must be attached to the telescoping pole under the head.

      The AM 9144 with option "very short" is a perfect bracket system allowing a height setting range of 0.8-1.4 m. According to IEC62493, the minimum required height is 0.8 m, and AM 9144 allows continuous height adjustment up to 1.4 m in a telescopic manner. Adding extension poles with fixed lengths of 0.6m and 1.2m, the range of 0.8m to 3.2m can be continuously adjusted.

      The EMI receiver measures 50Ω and must be connected to the BNC connector on the bracket clip. In order to determine whether the luminaire meets the standard, the measured voltage must be converted into an induced current density. The measured density must be expressed in the allowable density and must be summed. The result is a factor called F. If F does not exceed 0.85, the DUT meets the requirements. These calculations are easily integrated into Messbase software. The following receiver types can be used to perform measurements: FCKL 1528, FMLK 1518, FCLE 1535. If a different type of receiver is used, or if the Messbase software is not available, the "Van der Hoofdenest" program can be used to calculate F from the measured voltage.

      Typical transmission of protection circuits, including tolerance limits for calibrating measuring devices.

      Output diagram of the protection circuit

      Testing according to IEC 62493 using Schwarzbeck Messbase software, according to IEC 62493, the test parameters of the receiver are as follows:

      1. BandA (20kHz – 150kHz): peak detector, 220 Hz step, direct input, low distortion, test time 100 ms, bandwidth 200 Hz.

      2. Band B (150 kHz – 10 MHz): peak detector, 10 kHz step, direct input, low distortion, test time 20 ms, bandwidth 9 kHz.

      During the test, the receiver does not call any antenna factor file, and measures band A and band B respectively to obtain the voltage measurement result. Note that possible sources of error: Because each band must use a different measurement time, band A and band B must be measured separately.

      Once the measurement is complete and saved, factor F can be calculated. To perform the calculation, the measurements on positions 1 and 2 must be loaded into the Messbase software. It does not matter if band A or band B is loaded to position 1 or 2.

      After that, you have to click on the button on the taskbar. During the calculation, band A and band B measurements are combined, factor F is calculated and entered into the last comment line. Finally, save the measurement results.

      Calculate the F factor using independent software

      If the Messbase software is not available or a different meter is used, the downloadable software "Van der Hoofden Test" can be used. It allows F to be calculated based on the measured voltage. The data must have the following format:

      Frequency1,Level1

      ... ...

      ... ...

      FrequencyN,LevelN

      The frequency unit is kHz and the level unit is dBμV.

      Click the button "File", select the voltage file, click "calculate", you can get the F factor value:

      Especially for R&S measurement receivers, special software Van_der_Hoofden_Test_RSFormat.exe required. Include a sample file. The software works with Windows XP and Windows 8, Windows Vista and Windows 7 require additional installation of "vcredit_x86.exe" and "vcredit_x64.exe", this file can be downloaded from the Microsoft support webpage.

     

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