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GTEM Cells DC - 20 GHz Compliance Testing



GTEM Cells


G-TEM 250

G-TEM 500

G-TEM 750

G-TEM 1000

G-TEM 1250

G-TEM 1500

G-TEM 1750

G-TEM 2000





The GTEM cell is a TEM 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 published standard IEC 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 20GHz. 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, pre-compliance, compliance, or production sampling stage, the GTEM is the right choice for you.


DC - 20 GHz



GTEM Cells acc. to IEC/EN 61000-4-20

GTEM Optional Accessories

GTEM test set-up for radiated immunity tests
and emission measurements

Connection to the loop is through a BNC connector which enables coaxial cabling to the EMI receiver. The loop is supplied with a correction factor graph showing the values in dB which must be added to the reading of a 50 ohm EMI meter to obtain answers in either dB/μV/m or dB/pT. The correction factor decreases as frequency increases from 30 Hz up to approximately 15 KHz, where the factor levels off and remains relatively constant up to 5 MHz.
The Type 7334-1 Loop Antenna is required by Test Method RE01 in Parts 2 through 6 of MIL-STD-461C and RE101 of MIL-STD-461D.These portions of the specification require magnetic field emission tests of cables, equipments, systems and sub-systems installed in, or used in, all phases of military vehicles, ships, submarines, aircraft (including helicopters), spacecraft, or ground-based operations.

The Type 7334-1 Loop Antenna is positioned 7 cm from the face of the equipment under test with the plane of the loop parallel to the equipment face. The best position to begin with is opposite or near a joint or seam.
The associated EMI meter is then scanned over the range 30 Hz to 100 KHz searching for emissions. At the frequencies where emissions are found, the loop antenna is moved about the surface seeking the strongest emission level.
When a strong signal is detected, the loop is oriented on its axis for a maximum reading. This procedure is repeated for all surfaces of the equipment under test. Although the specification is not clear on the point, it appears to indicate that all six sides (including the bottom) of an equipment must be tested in this manner.
When testing cables, the loop antenna is placed 7 cm from the cable with the plane of the loop parallel to the cable. The non-metallic base plate of the Type 7334-1 Loop Antenna provides a convenient means for establishing the correct 7 cm distance.




 Last Updated: July 24, 2017

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