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LAPLACE INSTRUMENTS RF300 User Manual

Large loop antenna
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LAPLACE INSTRUMENTS LTD
RF300
USER GUIDE
LAPLACE INSTRUMENTS LTD
RF300 LARGE LOOP ANTENNA
USER GUIDE
Serial Number 9039
Issue 4 February 1999
Page 1

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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 9039 Issue 4 February 1999 Page 1...
  • Page 2 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE INDEX Introduction Packing list Assembly Calibration Operation In use with the EMCEngineer software Appendix A...Calibration data 15 Page 2...

  • Page 3: Packing List

    100Hz. Construction of the RF300 is as detailed in annex B of EN55015. 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 Central pillar Switch unit Short co-ax patch cable fitted with BNC connectors Loop transducers Tiewraps 1¾ x 8 wood screws 5m BNC - BNC lead...
  • 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 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 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. See fig 6. Slight ‘drooping’ of the loop between the posts has no effect on the performance of the antenna.
  • Page 8 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 9 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 10 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Page 10...

  • Page 11: Calibration Loop

    LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Calibration loop The RF300C calibration loop is manufactured to comply with CISPR15 and EN55015. Full details of the use of this loop are provided in these standards. Page 11...
  • Page 12 -2.2dB If using the SA1000 analyser: The RF300 is listed under the normal Inputs menu. Just select this device and the software automatically applies the appropriate correction factors so that the trace reads correctly in dBuA and can be compared directly with the EN55015 limits.

  • Page 13: Operation

    Measurement with the SA1000 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. Contact your supplier) All versions higher than 2.74 have the RF300 item.
  • Page 14 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE 8. If the background and the product is ‘quiet’, and especially at frequencies above 20MHz, the SA1020 pre-amplifier should be used to increase the sensitivity of the system. Set the Pre-amp buttons on the screen accordingly. Care should be taken when using the pre-amplifier as the antenna then becomes extremely sensitive.

  • Page 15: Calibration Data

    LAPLACE INSTRUMENTS LTD RF300 USER GUIDE APPENDIX A CALIBRATION DATA EN55015 ‘ideal’ plot 2. Calibration data. 3. RF300 actual sensitivity plots and RF300 correction plot (Antenna Factor) Page 15...
  • Page 16 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE EN55015 Standard antenna response EN55015 standard antenna response 0.01 Frequency (MHz) Page 16...
  • Page 17 1.00 30.00 30.00 -24.67 Calibration sources Laplace Instruments Ltd, RF300C calibration loop to CISPR15 Laplace Instruments Ltd, SA1000 Spectrum analyser s/n 3061 Calibration: Laplace: 14.12.07 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...
  • Page 18 LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Actual output plots for the loops Output - RF300 s/n 9039 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 0.01 0.10 1.00 10.00 100.00 Frequency (MHz) Antenna factor RF300 s/n 9039 10.00 5.00 0.00...