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RF200

Antenna

User Manual

Version 3.0

January 2004

LAPLACE INSTRUMENTS LTD

3B, Middlebrook Way

CROMER

Norfolk NR27 9JR

UK

Tel: 012 63 51 51 60

Fax: 012 63 51 25 32

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Содержание RF200

Страница 1: ...RF200 Antenna User Manual Version 3 0 January 2004 LAPLACE INSTRUMENTS LTD 3B Middlebrook Way CROMER Norfolk NR27 9JR UK Tel 012 63 51 51 60 Fax 012 63 51 25 32 ...

Страница 2: ...00 500 user manual 2 Index 1 0 Introduction Page 3 Background 2 0 RF200 broadband antenna Page 4 Assembly Page 4 In use Page 6 Antenna Factor Page 7 3 0 Ground Plane Page 8 4 0 Test site calibration Page 9 ...

Страница 3: ...nna factor correction to the spectrum 1 2 Dipole or broadband antenna which to use EN50022 specifies that a tuned dipole be used as the antenna for radiated emissions testing The dipole is a basic standard that at its tuned frequency has an easily definable output vs field strength characteristic Dipoles are tuned by adjusting the length of each element to be wavelength long If measuring the emiss...

Страница 4: ... fig 1 1 The aluminium alloy elements are secured to the central beam using the M4 bolts and washers provided An M4 hex driver is also included to facilitate assembly These elements are mounted in equal length pairs with the shortest at the end of the central beam where the output cable is attached There are two copper crinkle washers with each bolt Ensure that one washer is under the bolt head an...

Страница 5: ...RF200 500 user manual 5 Fig 1 RF200 Assembly RF200 Stand assembly ...

Страница 6: ...of the pre amplifier It is easy to get the amplifier wrong way round Point the antenna sharp end forward at the UUT Note that the antenna is directional but full sensitivity is maintained over a wide angle either side of dead ahead The reference point for the measurement of EUT Antenna distance is the central mounting point where the vertical pole meets the horizontal main antenna beams The height...

Страница 7: ...on and may be subject to gross errors Reception of emissions radiated from the UUT depend on the test conditions the test site reflections ground plane background radiation UUT to antenna distance etc etc Be very wary about relating field strengths to limit lines unless you have some known test results to act as a reference Fig 3 a RF200 Antenna factor linear frequency scaling Note Antenna factor ...

Страница 8: ...pends on ground conditions and may vary very considerably in amplitude On soft ground such as earth soil the reflection will vary from day to day as conditions change This means that the integrity and consistency of the results will be variable To overcome this problem the standards require a test site to have a metal ground plane consisting of a continuous metal sheet or equivalent under the UUT ...

Страница 9: ...ion The white areas correspond to gain and the dark areas represent attenuation If using an open field site on dry soil the reflection will be small and the gain attenuation effect will be minimal However if any metal surface is in the vicinity filing cabinet for instance this chart gives some idea of the consequences Note that the chart is correct for the conditions listed only If for instance th...

Страница 10: ... rough calibration is to use a product with known emissions i e one which has already been tested at a test house on your test site under exactly the same conditions as applied during the test house measurement By correlation of your results with the test house results an approximate calibration of the site can be derived Note that if the site is outdoors it will need a calibration check every tim...

Страница 11: ...RF200 500 user manual 11 LAPLACE INSTRUMENTS LTD 3B Middlebrook Way Cromer Norfolk NR27 9JR Tel 44 0 12 63 51 51 60 Fax 44 0 12 63 51 25 32 E tech laplace co uk Web www laplaceinstruments com ...

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