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LAPLACE INSTRUMENTS RF300 User Manual

Other manuals for RF300: User Manual
Manual is about: LARGE LOOP ANTENNA

Summary of RF300

  • Page 1

    Laplace instruments ltd rf300 user guide page 1 laplace instruments ltd rf300 large loop antenna user guide serial number 9039 issue 4 february 1999.

  • Page 2

    Laplace instruments ltd rf300 user guide page 2 index introduction 3 packing list 3 assembly 5 calibration 12 operation 13 in use with the emcengineer software 13 appendix a...Calibration data 15.

  • Page 3

    Laplace instruments ltd rf300 user guide page 3 introduction the rf300 large loop antenna has been developed to meet the requirements of en55015, section 4.4, table 3, column 2. This specifies the limits for magnetic field induced current for luminaires with lamp operating frequencies in excess of 1...

  • Page 4

    Laplace instruments ltd rf300 user guide page 4 qty item 3 large loops fitted with connectors at each end 4 corner posts 4 base extensions 1 central pillar 1 switch unit 1 short co-ax patch cable fitted with bnc connectors 3 loop transducers 5 tiewraps 4 1¾ x 8 wood screws 1 5m bnc - bnc lead 3 2m b...

  • Page 5

    Laplace instruments ltd rf300 user guide page 5 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...

  • Page 6

    Laplace instruments ltd rf300 user guide page 6 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. The retaining ring on each connector needs to be screwed fir...

  • Page 7

    Laplace instruments ltd rf300 user guide page 7 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. 6. The second lo...

  • Page 8

    Laplace instruments ltd rf300 user guide page 8 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 c...

  • Page 9

    Laplace instruments ltd rf300 user guide page 9 8. The loops can now be adjusted for best shape and position. Generally the vertical loops will tend to sag into the lower half of the antenna. These are held up in position by using the tiewraps as shown in fig 8 on each corner post to take some on th...

  • Page 10

    Laplace instruments ltd rf300 user guide page 10

  • Page 11

    Laplace instruments ltd rf300 user guide page 11 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 12

    Laplace instruments ltd rf300 user guide page 12 calibration data see appendix a the calibration data for each loop is virtually identical. The following details therefore apply to all three axes, although full data for each axis is given in the appendix. For reference, the ‘ideal’ curve is shown in...

  • Page 13

    Laplace instruments ltd rf300 user guide page 13 operation the method of measurement is given in en55015, section 7. A copy of this should be consulted if performing compliance tests. The uut should be mounted on a wooden frame or table in the centre of the antenna. The position is not critical. The...

  • Page 14

    Laplace instruments ltd rf300 user guide page 14 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...

  • Page 15

    Laplace instruments ltd rf300 user guide page 15 appendix a calibration data 1. En55015 ‘ideal’ plot 2. Calibration data. 3. Rf300 actual sensitivity plots and rf300 correction plot (antenna factor).

  • Page 16

    Laplace instruments ltd rf300 user guide page 16 en55015 standard antenna response en55015 standard antenna response 0 5 10 15 20 25 30 35 40 45 50 0.01 0.1 1 10 100 frequency (mhz) o u tpu t (d b u v).

  • Page 17

    Laplace instruments ltd rf300 user guide page 17 calibration data freq. Calibration freq. En mhz 9039a 9039b 9039c mhz average max min range freq 55015 freq a.F 0.01 42.00 42.00 42.00 0.01 42.00 42.00 42.00 0.00 0.01 46 0.01 4.00 0.04 50.00 50.00 50.00 0.04 50.00 50.00 50.00 0.00 0.04 46.5 0.04 -3.5...

  • Page 18

    Laplace instruments ltd rf300 user guide page 18 actual output plots for the loops output - rf300 s/n 9039 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 0.01 0.10 1.00 10.00 100.00 frequency (mhz) o u tpu t (d b u v) antenna factor rf300 s/n 9039 -35.00 -30.00 -25.00 -20.00 -15.00 -10.00 -5.0...