LAPLACE INSTRUMENTS RF300 Mk II-A, User Manual

Page: 19 / 32

Laplace Instruments Ltd
Page 19
6.0 Operation
Details of the measurements and limits are given in EN55015, section
4.4. 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.
Connecting cables to the EUT should leave the volume enclosed by the
loops in such a way as to be kept away from the loops to avoid capacitive
coupling. See Fig C6 in CISPR16.
Each axis (loop) should be measured in turn. Each should meet the
requirements of the standard. The loops are individually selected by
connecting the short patch lead to the appropriate input socket as shown
in fig 11.
6.1 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. Contact your supplier)
2 Under the limits menu, select the EN55015 ......... 2m loop antenna
limit line.
3. Connect the switch unit to 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 in compression by
changing the input attenuator setting on the analyser and comparing
scans. Apart from the base line, the traces should overlay. If this
happens then it is OK to use the analyser with that attenuator setting. If
not, increase the attenuation and try again.
5. If the background is strong, it is advisable to either find a ‘quieter’
location or screen the room.
6. Switch the UUT on. Check the levels of signal over the background
levels using the techniques used for conventional radiated testing as
described in the user guide.
The levels displayed are fully compensated for the RF300 characteristics