ETS-Lindgren 7604 Shielded Coil Antenna - Manual (Page 15)

The graph provides two conversion factors:
• The top curve is for a 50-ohm load and is valid to 1 MHz.
• The bottom curve is for an unloaded condition and is not valid above
50 kHz. Since the coil impedance is approximately 110 ohms at
50 kHz, the EMI meter input impedance must be 500 ohms or higher to
use the unloaded conversion.
The two curves are provided to allow for the use of both 50-ohm EMI meters and
certain audio or VLF EMI meters. These EMI meters cover frequencies ranging
from 20 Hz at the low end; at the high end they cover from 15 kHz to 50 kHz.
They usually have input impedances ranging from 500/600 ohms to 100 kilohms
or higher.
Operation | 15