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GTEM 500 Radiated Emission and Immunity Testing for IEC/EN 61000-4-20

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Max EUT Size: (200 x 200 x 150mm) (7.87 x 7.87 x 5.90in.)
IEC/EN 61000-4-20 (CEI 210-78)
both radiated emission and immunity measurements
Testing in Transverse Electromagnetic (TEM) Waveguides
(Equipment Under Test) up to a frequency range of 20 GHz
Fully INOX steel rugged military grade construction
Unique compact design
Optimized for EMI and EMC
Strong fields achieved with low input power
Broadband up to 20Ghz
High effective shielding
Single Phase AC Power Line Filter 2x 16A
RF feed-thru SMA type connector
RF feed-thru N type connector
Channel for fiber optic leads (3 fiber pairs)
Phase+N+Ground
10A 80V DC 2 poles line filter

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GTEM 500 Radiated Emission and Immunity Testing for IEC/EN 61000-4-20
Max EUT Size: (200 x 200 x 150mm) (7.87 x 7.87 x 5.90in.)
IEC/EN 61000-4-20 (CEI 210-78)
both radiated emission and immunity measurements
Testing in Transverse Electromagnetic (TEM) Waveguides
(Equipment Under Test) up to a frequency range of 20 GHz
Fully INOX steel rugged military grade construction
Unique compact design
Optimized for EMI and EMC
Strong fields achieved with low input power
Broadband up to 20Ghz
High effective shielding
Single Phase AC Power Line Filter 2x 16A
RF feed-thru SMA type connector
RF feed-thru N type connector
Channel for fiber optic leads (3 fiber pairs)
Phase+N+Ground
10A 80V DC 2 poles line filter
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GTEM 500 Datasheet

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Test Equipment Description

The GTEM 500 cell is a GTEM waveguide with the upper frequency limit extended to the GHz range. It is a low-cost alternative measurement facility for both radiated emission and immunity measurements. It is included in the recently published standated IEC/EN 61000-4-20 "Emission and Immunity Testing in Transverse Electromagnetic (TEM) Waveguides”. Compared to other measuring methods like EMC test in anechoic chambers or OATS (Open Area Test Sites), GTEM-cells offer some significant advantages for the testing of small and medium sized EUT's.

(Equipment Under Test) up to a frequency range of 20 GHz. Quick turnarounds of the EUT as well as numerous testing variations are easy and fast to handle. Switching from emission to immunity testing requires only simple adjustments from receiver input to amplifier output. You are irrespective of long waiting times associated with off-site test labs or weather and ambient delays that can occur at OATS facilities. Whether you are at the design qualification, precompliance, compliance, or production sampling stage, the GTEM is the right choice for you!

Theory of operation

GTEM 500 cells (Giga-hertz Transversal Electro-Magnetic cells) are waveguide structures intended for electromagnetic compatibility measurements, as well as biomedical applications. The electromagnetic field distribution inside the cell is in TEM mode. With TEM mode propagation, there is no component of electric and magnetic field in the direction of propagation of electromagnetic wave. Therefore the field components are strictly perpendicular. Assuming the field distribution ideal TEM below the cut-off frequency of the cell (before the introduction of higher order modes), the electromagnetic field distribution can be considered static.

GTEM 500 Applications

EMI and EMS devices
Radiation and susceptibility test
Specifically designed for telecom application
Biomedical and dosimetrical applications
Isotropic sensors calibration
Receiver sensitivity test

Specifications
Operating range	100 kHz - 20GHz
RF Input	Max continuous. input power: 250 W
RF Input connector type	"N" type female connector
Shielding	Better than 65 to 110dB depending from frequencies
Absorbers	350 mm TDK
Outer cell dimension	300X168X115 (LxWxH)
Door Size	40 x 40 (cm)
Construction	Fully INOX steel rugged military grade construction

GTEM 500 Installation Manual and General Safety Instructions

The GTEM GigaHertz Transverse Electromagnetic) cell is a precision electromagnetic compatibility (EMC) test instrument primarily intended for use as radiated immunity and radiated emission test facility without environmental electromagnetic interference. The cell is electrically similar to a coaxial cable with one side open (the apex) and other side closed on the impedance of the generator or receiver connected. In this case with a multimeter appears as 50 Ohm resistance.

Measurement Setup

The setup for emission measurements in a GTEM cell is shown below. The EUT is placed inside the GTEM and its radiation is measured with a receiver. The receiver can be software controlled and some software that includes the GTEM to OATS correlation is commercially available.