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LAPLACE INSTRUMENTS LTD

RF300

USER GUIDE

Page 12

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.

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Содержание RF300

Страница 1: ...LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Page 1 LAPLACE INSTRUMENTS LTD RF300 LARGE LOOP ANTENNA USER GUIDE Serial Number 9072 Issue 5 May 2010...

Страница 2: ...S LTD RF300 USER GUIDE Page 2 INDEX Introduction 3 Packing list 3 Assembly 5 Calibration loop 12 Calibration 13 Operation 14 In use with the EMCEngineer software 14 Appendix A Calibration data 16 Appe...

Страница 3: ...ements that can be compared directly with the limits Test setup and limits should be conducted as required by EN55015 section 4 4 Packing List On receipt of the RF300 check the contents of the package...

Страница 4: ...d 4 Corner posts 4 Base extensions 4 Post stabilisers 1 Central pillar 1 Switch unit 1 Short co ax patch cable fitted with BNC connectors 3 Loop transducers 5 Tiewraps 8 1 x 8 wood screws 8 1 x 8 wood...

Страница 5: ...g 2 Figure 2 Base assembly Set centre and base extensions Figure 2 Base assembly Set centre and base extensions 3 Attach corner post stabilisers with 2 short brass screws as shown in fig 3a and then s...

Страница 6: ...y to the socket but take care These rings will bind and be difficult to turn unless the loop is aligned properly Force is not necessary simple jiggle the loop into alignment and the ring will turn eas...

Страница 7: ...a Rest horizontal loop on top of posts Position transducer close to one post Figure 6 Mounting of horizontal loop Rest horizontal loop on top of posts Position transducer close to one post Figure 6 Mo...

Страница 8: ...loop Note orientation of central post Position transducer near bottom Figure 7 Mounting of second loop Figure 9 Central post configuration Second loop Third loop Figure 9 Central post configuration S...

Страница 9: ...entral 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 Adjust loops to optimum configuration an...

Страница 10: ...rmance EN55015 states in section 7 2 that even the position of the UUT in the antenna is not critical 9 Within the loop construct a wooden stand or table to suit the products to be tested This is not...

Страница 11: ...To analyser Horiz X Vert Y Vert Z Loop transducers Ferrite absorbers are at this end of cables Select loop using link cable Figure 11 Connections to selector unit To analyser Horiz X Vert Y Vert Z Lo...

Страница 12: ...LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Page 12 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...

Страница 13: ...ectively converts the output from the RF300 measured in dBuV directly to dBuA The data can be used with any analyser or receiver capable of EMC measurements The estimated measurement uncertainty is 3d...

Страница 14: ...the analyser input 4 With the UUT switched off check the background signal level At frequencies below 1MHz the background can be very strong If strong signals do exist check that the analyser is not i...

Страница 15: ...GUIDE Page 15 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 frequencie...

Страница 16: ...LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Page 16 APPENDIX A CALIBRATION DATA 1 CISPR16 ideal plot 2 Calibration data 3 RF300 actual sensitivity plots and RF300 correction plot Antenna Factor...

Страница 17: ...LAPLACE INSTRUMENTS LTD RF300 USER GUIDE Page 17 EN55015 Standard antenna response CISPR16 LLA 2m diameter 60 65 70 75 80 85 90 95 100 105 110 0 01 0 1 1 10 100 Freq MHz Validation factor dBohms...

Страница 18: ...01 46 0 01 8 65 0 04 48 68 47 68 48 68 0 04 48 35 48 68 47 68 1 00 0 04 46 5 0 04 1 85 0 10 55 68 55 68 55 68 0 10 55 68 55 68 55 68 0 00 0 10 46 5 0 10 9 18 0 20 62 68 62 68 62 68 0 20 62 68 62 68 62...

Страница 19: ...tual output plots for the loops Output Output RF300 s n 9072 0 10 20 30 40 50 60 70 80 0 0 1 10 100 Frequency MHz Output dBuV Antenna factor Antenna factor s n 9072 30 25 20 15 10 5 0 5 10 15 0 01 0 1...

Страница 20: ...cant changes Annex B Annex C Description construction and validation of LAS Both annexes combined into one Annex C Clause B1 Clause C1 Introduction Loop antenna named LAS Loop Antenna System Clause B2...

Страница 21: ...and Ii is the loop current Vs 1V 1 000 000uV Under old CISPR15 for Ii 100KHz 46dBuA 200uA So the new CISPR16 value is 20 log 1000000 200 74 dB and Old CISPR15 for Ii 30MHz 29dBuA 29uA So the new CISPR...

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