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Summary of Contents for LAPLACE INSTRUMENTS LAPLACELL 600
- Page 1 LAPLACELL 600 Serial number 0619 USER GUIDE Issue 3 September 2003 LAPLACE INSTRUMENTS LTD...
- Page 2 CLIENTS user guide Introduction INDEX INTRODUCTION SPECIFICATION 2.1. Performance 2.2. Construction 2.3. Internal sensor 2.4. EUT I/O facilities INSTALLATION 3.1. EUT Connections 3.2. RF Connections EMISSIONS 4.1. Emission test notes 4.2. Cell characteristics 4.3. Calibration IMMUNITY 5.1. The standard 5.2. General requirements 5.3.
- Page 3 CLIENTS user guide Introduction 1.0 INTRODUCTION The LaplaCell 600 This EMC test cell provides a fully calibrated compact test facility for the hassle-free measurement of the EMI/EMC performance of products. * Immunity and emissions testing * Emissions measurements correlated to OATS * Immunity testing to IEC61000-4-3 * Exceptionally compact package.
- Page 4 CLIENTS user guide Introduction For immunity testing the cell incorporates a calibrated field sensor, avoiding the use of a separate sensor with associated fiber optic links. The fact that a direct connection is provided to the sensor avoids the need to slow the response time of the sensor to conserve battery power. The settling time of this cell is consequently much faster than with most other types of cell.
- Page 5 CLIENTS user guide SA1000 2.0 LaplaCell 600 Specification 2.1 Performance General Usable EUT volume: 600mm cube EUT weight: 100kg (Spread load) Internal size: 780mm x 870mm x 820mm Calibrated frequency range: 30MHz - 2GHz (in two ranges) Screening attenuation: <60dB...
- Page 6 CLIENTS user guide SA1000 2.2 Construction 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 construction. The EUT usable area is contained within a Polypropylene enclosure.
- Page 7 See section 3.3. 2.6 Internal lighting and camera The LAPLACELL 600 is wired, via the ”filter box„, to allow the fitting of an internal camera and lighting unit to external power supplies and a video monitor without introducing spurious background noise.
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Page 8: Installation
CLIENTS user guide SA1000 Connections Wiring for the camera system is via a 5 pin 180° DIN connector (pin to pin through the filter box) Power required for the camera system is 12 volts dc 110mA. Pin 1 - Camera - video Bottom left pin Pin 3 - Camera - 0 volts Top centre pin... - Page 9 CLIENTS user guide SA1000 Panel for external connections including mains power, camera, general purpose I/O and any custom connections as specfied Maintenance No routine maintenance is required for the chamber. Calibration Annual calibration is recommended. Call your local representative for details. Access The only access into the cell is via the hinged door.
- Page 10 CLIENTS user guide SA1000 EUT Inputs and Outputs Connections to the EUT are provided at the rear of the cell. External connections are made at the lower face of the filter unit, see figure 1 above. Mains, general I/O, camera and cell illumination connections are provided.
- Page 11 CLIENTS user guide SA1000 Figure 2 Typical connections at filter unit Figure 3 Rear view of cell showing facilities for connections to EUT inside the cell. Page 11...
- Page 12 CLIENTS user guide SA1000 3.2 RF connections The RF connection to the cell is mounted on the nose panel, see figure 4. It is recommended that once the main RF cable has been attached to the chamber, it should never be disconnected from that end.
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Page 13: Emission Measurements
CLIENTS user guide SA1000 4.0 Emission Measurements 4.1 Practical notes The Lc600 cell has a dual range technology which enables it to perform over a wide frequency range, from 30MHz to well above 3GHz. When making emissions measurements, the EUT should initially be placed on the floor of the test volume, in the centre of the chamber. - Page 14 CLIENTS user guide SA1000 4.2 Cell characteristics The cell may be distinctly non linear in frequency characteristics. Generally each cell is individually calibrated by the manufacturer and the resultant characteristics programmed into the software. The calibration data for this cell is supplied on the 3.5„ disk included with this shipment. 4.3 Calibration - Emissions The nominal A.F.
- Page 15 CLIENTS user guide SA1000 Individual plots for each location in EUT volume (Cell020) 100 200 300 400 500 600 700 800 900 1000 1100 Frequency (MHz) Figure 6. Measurements of the ERS at 12 locations in one quadrant of the test volume. The ’antenna factor“...
- Page 16 CLIENTS user guide SA1000 ERS cal data 1000 Figure 7. ERS calibration data The ERS data used for the calibration is shown in figure 7. Comparison of actual and highest/lowest A.F. values (Cell 020) 1000 Frequency (MHz) Figure 8. Cell Antenna Factor for 3 metre OATS The thick line shows the cell A.F.
- Page 17 CLIENTS user guide SA1000 Worst case AF dev (L) Worst case AF dev (H) Figure 9. This shows the maximum errors as derived from figure 8. As can be seen, in no circumstances can a high readings of more than 4 dB be obtained, however, low readings over 10 dB are possible above 600MHz.
- Page 18 CLIENTS user guide SA1000 Error distribution (% of frequencies) 70.00 60.00 50.00 B,D,H,J 40.00 C, E, F, K D, F, I, M 30.00 20.00 10.00 0.00 -6.00 -4.00 -2.00 0.00 2.00 4.00 6.00 Deviation (dB) Figure 11 This shows the error distribution for each of the three tests above. The percentage of results within 2dB of the actual is 89.96%, 87.91% and 92.83% respectively and within 3dB the figures are 96.31%, 97.34% and 97.34%.
- Page 19 CLIENTS user guide SA1000 5.0 Immunity IEC61000-4-3 IEC61000-4-3 immunity testing requires that the EUT (equipment under test) operates satisfactorily when subject to a strong electromagnetic field. This requires a scan at a certain fixed level (specified by the standard) of field strength. The scan will comprise a series of ’steps“...
- Page 20 CLIENTS user guide SA1000 Figure 12. Immunity testing connections 5.3.1 Field probe and door interlock connections The 8 pin DIN connector on the nose of the cell must be connected to the control system for immunity testing if using the RF2000. The wiring information is shown in the diagram below. If using the Laplace RF2000 synthesiser, an 8 way cable is included with the system, otherwise a mating connector is supplied.
- Page 21 CLIENTS user guide SA1000 Calibration An Excel spreadsheet file is supplied with each cell. For Cell 619, the file is cell619.xls. This file is provided for information purposes. Separate files, derived from this .xls file, are used by the emissions and immunity software when operating the cell.
- Page 22 CLIENTS user guide SA1000 ANNEX 1 Calibration data for cell 619 Cell switching frequency: 350MHz Page 22...
- Page 23 CLIENTS user guide SA1000 Cell 619 - Emissions (L) 1000 Frequency (MHz) Page 23...
- Page 24 CLIENTS user guide SA1000 Cell 619 - Emissions (H) 25.00 20.00 15.00 10.00 5.00 0.00 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Frequency (MHz) Page 24...
- Page 25 CLIENTS user guide SA1000 Cell 619 - Immunity (L) 2.500 2.000 1.500 3 V/m 7 V/m 12 V/m 20 V/m 1.000 0.500 0.000 1000 Frequency (MHz) Page 25...
- Page 26 CLIENTS user guide SA1000 Cell 619 - Immunity (H) 3.000 2.500 2.000 3 V/m 7 V/m 1.500 12 V/m 20 V/m 1.000 0.500 0.000 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 Frequency (MHz) Page 26...