RA Mayes | TEM Cell and LaplaCell Cells for Immunity and Emissions Testing

TEM Cell (Open)
Picture	Model	Features
	TEM Cells - Open DC to 3 GHz	These open TEM cells (tri-plate cells) are well suited for immunity testing of small objects according to European (CE) and automotive standards (SAE J1113-25) or for biological experiments. The advantage of these TEM cells is that they are open and it is very easy to control the functions of the equipment under test. The applications are for instance the immunity testing of watches, pagers, telephones or PCB's. In comparison with other closed TEM cells, the price is low. The field decreases rapidly outside the open TEM cells (approx. 33 dB at 1 meter) and it is therefore possible to use an open TEM cell in ordinary facilities. Another very interesting application is the calibration of field probes because the field inside the TEM cell is known with high precision. TEM cells are the most precise structures for field calibrations.
* can be equipped with a test set-up for IC or PCB according to SAE J1752-3.

EMC Test Cells

Picture

Model

Description / Features

LaplaCell600/2

EMC Compliance Test Cell

30 MHz to 3 GHz

Immunity
IEC61000-4-3

Emissions
EN, FCC, As/NZ, and CISPR standards

Same RF features as the LaplaCell300/2 below, but with eight times the EUT test volume.

EUT Size: 23.64" x 23.64" x 23.64"

60cm x 60cm x 60cm

Usable EUT Test Volume: 30.7" x 32.3" x 34.2"

78cm x 82cm x 87cm

Rear view of an LC300/2 showing the main door for access to the EUT volume.
On the right is the access for the filter block terminations.

LC300/2, view showing the typical layout of an LC300/2 filter block output. Cables from the EUT in the volume of the cell are terminated here.

This is the view of the rear of an LC600/2. On the left is the filter block access door, on the right is the main access to the EUT volume. The cell is shown here with its main access door open.

LaplaCell300/2

EMC Compliance Test Cell

30 MHz to 3 GHz

Immunity
IEC61000-4-3

Emissions
EN, FCC, As/NZ,
and
CISPR standards

The cell provides the core of a totally integrated system which will deliver a complete, PC controlled Emissions and Immunity test package.

You can easily self certify & self calibrate your own test cell

The cell is a stainless steel fabrication with continuously welded joints all round, giving a totally screened enclosure which is completely maintenance free and will not degrade with time.

The main body of the cell is made from 18swg sheet giving a very strong unit but with an overall weight of only 100kg.

The EUT usable area is contained within a Polypropylene enclosure.

All calibration & correction factor data for Emissions & Immunity provided to you.

100 Watts Maximum

EUT Size: 11.8" x 11.8" x 11.8"

30cm x 30cm x 30cm

Usable EUT Test Volume: 20.0" x 18.9" x 16.1"

51cm x 48cm x 41cm

Immunity
IEC61000-4-3 sets the requirements for RF immunity testing. It specifies fields of up to 10V/m over the range 80MHz to 1GHz and provides minimum performance requirements. The LaplaCell range fully meets these requirements and when used in conjunction with the Laplace synthesizer and power amplifier, provides a complete integrated solution .

Emissions
EN, FCC, As/NZ, and CISPR standards all require the use of an OATS (Open Area Test Site) for the measurement of emissions. This is a demanding requirement in terms of space, resources, calibration and expertise. The LaplaCell range provides an ideal alternative solution, delivering equivalent OATS performance without OATS problems.

Fields within EUT volume

Uniformity: The balanced septum design ensures good uniformity, even when compared with the "industry standard" GTEM type.

The above views make this obvious.

Impedance: The aim of a test cell is to emulate an OATS test. Free space impedance as applies to OATS sites is 377 ohm. Conventional test cells are 50 ohm systems. The unique design of the LaplaCell matches the incoming 50 ohm impedance to around 200 ohm inside the cell, a much closer match to free space impedance.

Specification

LaplaCell 300/2

LaplaCell 600/2

Maximum EUT Size:

30 x 30 x 30 cm

60 x 60 x 60 cm

Usable EUT volume:

51 x 48 x 41 cm

78 x 82 x 87 cm

Calibrated frequency range:

30MHz - 3GHz

30MHz - 3GHz

Max RF power in:

100W

100W

Power for 10V/m:

5W

10W

Field @ max RF in:

60V/m

40V/m

Auxiliary Power Requirement:

5V dc @ 25mA

24V dc (mains power unit supplied with cell, 110-240V ac)

Range Switching:

2 bands, switched (local & remote switching)

Screening attenuation

>60dB

Internal damping:

Ferrite absorbers

EUT Power Dissipation:

100W max

EUT cooling:

Optional forced air system