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Summary of Contents for LAPLACE INSTRUMENTS RF300
- Page 1 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE LAPLACE INSTRUMENTS LTD RF300 LARGE LOOP ANTENNA USER GUIDE Serial Number 9072 Issue 5 May 2010 Page 1...
- Page 2 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE INDEX Introduction Packing list Assembly Calibration loop Calibration Operation In use with the EMCEngineer software Appendix A...Calibration data Appendix B… CISPR16 Page 2...
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Page 3: Packing List
100Hz. Construction of the RF300 is as detailed in annex C of EN55016. This antenna is fully compliant with the standard and details of the calibration factors are included in this manual. - Page 4 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Item Large loops fitted with connectors at each end Corner posts Base extensions Post stabilisers Central pillar Switch unit Short co-ax patch cable fitted with BNC connectors Loop transducers Tiewraps 1¾ x 8 wood screws 1”...
- Page 5 USER GUIDE Assembly 1. Establish an appropriate area to erect the RF300. This needs to be a clear area at least 4m square with a flat floor and a ceiling height of at least 3m. 2. In the centre of this area, stand the central pillar and fit the base extensions as shown in fig 2.
- Page 6 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Figure 4 Figure 4 Loop assembly Loop assembly 4. Prepare the 3 loops. The configuration of these loops is as shown in fig 4 and fig 5. The connectors on each end of the loop are mated with the sockets either side of each loop transducer.
- Page 7 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE 5. The first loop to mount is the horizontal loop. To mount the loops, at least two people are required. Do not try to do this single handed..it will only end in tears. Mount the loop in the recesses at the top of each corner post with the loop transducer close to (within 5 cm) of a corner post.
- Page 8 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Install first vertical loop. Install first vertical loop. Note orientation of Note orientation of central post. Position central post. Position transducer near bottom transducer near bottom Figure 7 Figure 7 Mounting of second Mounting of second...
- Page 9 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE 7. The final loop is now fitted INSIDE the other two. See fig 10. This fits in the upper slot in the central pillar, between the corner post ‘ears’ and under the other vertical loop at the top. Again arrange the loop so the transducer is close to the central pillar.
- Page 10 9. Within the loop, construct a wooden stand or table to suit the products to be tested. This is not included with the RF300 because it needs to be matched to individual customers requirements. The stand should hold the product roughly central within the loop.
- Page 11 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Loop transducers Loop transducers Vert Vert Vert Vert Horiz Horiz Ferrite absorbers are Ferrite absorbers are at this end of cables at this end of cables Select loop Select loop using link cable using link cable...
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Page 12: Calibration Loop
LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Calibration loop The RF300C calibration loop is manufactured to comply with CISPR16. Full details of the use of this loop are provided in this standard. Page 12... - Page 13 The data can be used with any analyser or receiver capable of EMC measurements. The estimated measurement uncertainty is 3dB. For a detailed explanation of the calibration of the RF300 and discussion of changes to CISPR15 (EN55015) and CISPR16, see appendix B If using the SA1002 or SA3000 analyser: The RF300 is listed under the normal Inputs menu.
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Page 14: Operation
Measurement with the SA1002 or SA3000 and EMCEngineer Windows software. 1. Select the RF300 item under the input menu. The vertical scale will indicate units of dBuA. (If this item is not available, you need a later version of the software. - Page 15 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE attenuator can be automatically compensated for in the software by adjusting the pre- amp settings on the screen. 8. If the background and the product is ‘quiet’, and especially at frequencies above 20MHz, use 0dB attenuation.
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Page 16: Calibration Data
LAPLACE INSTRUMENTS LTD RF300 USER GUIDE APPENDIX A CALIBRATION DATA 1. CISPR16 ‘ideal’ plot 2. Calibration data. 3. RF300 actual sensitivity plots and RF300 correction plot (Antenna Factor) Page 16... - Page 17 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE EN55015 Standard antenna response CISPR16 LLA (2m diameter) 0.01 Freq (MHz) Page 17...
- Page 18 1.00 30.00 30.00 -25.01 Calibration sources Laplace Instruments Ltd, RF300C calibration loop to CISPR16, annex C5. Laplace Instruments Ltd, SA1002 Spectrum analyser s/n 1010 Calibration: Laplace: 16.03.2009 Marconi TF2016A signal generator, s/n 118032/004 Calibration: Checked against Marconi TF2019A, s/n 118449-169 Advantest R4131D calibrated by Schaffner, 20.11.02 and checked against...
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Page 19: Antenna Factor
LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Actual output plots for the loops Output Output RF300 s/n 9072 Frequency (MHz) Antenna factor Antenna factor s/n 9072 0.01 0.10 1.00 10.00 100.00 Frequency (MHz) Page 19... -
Page 20: Technical Report
Appendix B Technical Report Laplace Instruments Ltd January 2010 RF300 Large loop antenna, an analysis of changes to the standards These changes are due to the amendments to CISPR15 and CISPR16 The latest versions are now ….. CISPR15:2006 + A2:2009 and... - Page 21 This is not important if the probe is ‘inside’ the calibration loop and has a linear transfer function with amplitude. These factors hold true for the probe that is used. So the RF300 antenna uses an antenna factor correction to produce a calibration that agrees with the validation factor. This antenna factor is supplied with each antenna, and is equivalent to the correction factors as supplied with all EMC antennas, test cells, LISNs and other types of transducer.
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