ETS-Lindgren 7606 Coil Antenna/Shielded Coil - Manual (Page 19)

Model 7606
Model 7606 is used with Model 7605 to calibrate the 7605 and other
instrumentation used in tests. With 51 turns of wire in a 4-cm diameter loop, it
has an effective area of 640 cm
2
(an effective diameter of 28.6 cm), improving
the sensitivity of measurements with a given instrument by more than 30 dB over
a small, single-turn loop. The response is tabulated in the Conversion Factors for
Model 7606 table on page 21 (and is proportional to the frequency shown in
Figure RS101-1 in Method RS101 of MIL-STD-462D).
The voltage induced in the loop, ei, is proportional to the area of the loop, the
number of turns, the frequency, and the average flux density within the area of
the loop. Equation 3 derived from [8] gives this relationship.
E QUATION 3
For the Model 7606, the open-circuit loop-terminal induced voltage in microvolts
for a magnetic flux density in picotesla is given in equation 4.
E QUATION 4
The general equation for the conversion factor is given by equation 5 and
equation 6, and includes the effects of loop impedance and load impedance.
Theory of Operation | 19