LAPLACE INSTRUMENTS RF300 User Manual - 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 graph 1. This is taken directly from
EN55015, annex B.
The corresponding curves for the RF300 are also given.
This ‘antenna factor’ correction data 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 3dB.
Note: If using the Laplace SA450B analyser:
(a) The measurements were taken using the following settings....
10KHz to 100KHz........Scan mode set to 100KHz/div (Low frequency range)
100KHz to 5MHz........Scan mode set to 500KHz/div (Low frequency range)
5MHz to 30MHz.........Scan mode set to 1MHz/div (high frequency range)
For accurate readings, use the same settings
(b) The antenna factor data in the antenna.ini file shows values 20dB higher than those
quoted in the attached plot. This is because the EMCEngineer software shifts the Y axis
values by 20dB.
Thus at 2.5MHz (for example) the true A.F. correction is -22.2dB and the antenna.ini
file shows -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.
Further details are given overleaf.