Measurement calibration GTEM chamber

NegotiableUpdate on 05/18

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Nature of the Manufacturer: Producers

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Overview

The metrological calibration GTEM chamber has the characteristics of wide bandwidth and high power, which can establish a high field strength calibration system for calibrating field strength probes and near-field field strength meters.

Product Details

The GTEM transverse electromagnetic wave transmission chamber (GTEMCel1) has the advantages of high cutoff frequency and large testing space, and has been widely used in electromagnetic compatibility measurement and research on electromagnetic field biological effects. GTEMCell can generate strong standard fields for electromagnetic sensitivity testing and experiments on electromagnetic field biological effects. It can also be used to measure the electromagnetic shielding effect of equipment such as chassis and cables. With certain mathematical models and auxiliary measurement equipment, GTEMCell can also be used for measuring radiation interference Experts have studied the distribution of the internal field in GTEMCell using the three-dimensional FDTD method, and the calculated and measured results are in good agreement.

The FF-GTEM40 GTEM chamber core board has a size of approximately 40cm and a uniform testing area of 13 × 13 × 13cm, which can meet the calibration requirements of almost all field strength instruments at home and abroad. FF-GTEM40 has ultra-low VSWR across all frequency bands and is calibrated by field strength meters.

The GTEM chamber is a device designed based on the principles of coaxial and asymmetric rectangular transmission lines. To avoid reflection and resonance of internal electromagnetic waves, it is designed in a conical shape with an N-type coaxial joint at the input end, and then the central conductor is flattened into a fan-shaped plate called the core plate. Form a rectangular uniform field area between the core board and the bottom board.

In order to ensure good transmission characteristics of spherical waves (strictly speaking, spherical waves propagate from the N-type joint to this device, but due to the small designed aperture angle, this spherical wave approximates a plane wave) from the input end to the load end, the terminal of the core board adopts a distributed resistance matching network, making it a non reflective terminal. Its end face is also coated with absorbing material, which is used to further absorb electromagnetic waves of different frequencies. Therefore, a uniform field strength testing area was created between the core and bottom plates of the small chamber. During the experiment, the test sample is placed in the testing area. In order to avoid excessive impact on the uniformity of the field due to the placement of the test sample, it is advisable for the height of the test sample to not exceed one-third of the distance between the core plate and the bottom plate.

The GTEM chamber does not require an antenna for RF radiation electromagnetic field immunity testing, making it convenient for automatic testing, greatly reducing testing time and lowering technical requirements for testing personnel. When the signal source is amplified and injected into one end (through an N-type coaxial joint), a strong and uniform electromagnetic field can be formed between the core board and the bottom board. The electric field monitoring probe placed near the measured object monitors this field strength, and the input power value is obtained through a computer. The signal source is directly adjusted to achieve the required field strength value. The measurement and control software controls the signal source to scan the frequency of the radiation field at a certain step size, and there is also a video monitor.