ETS-Lindgren 3144 Log Periodic Dipole Array User Manual
Page 22
For immunity testing, the electric field strength generated at a distance d can be
approximated by:
(
)
E
Pg
d
V / m
=
30
d
= distance, in meters
g
= numeric gain (10
G[dB]/10
)
P
= antenna net input power, in watts
An estimate of the power required for any field strength E can be obtained from
Typical Data on page 23. For any other field strength not shown, multiply the
power in watts by the desired E-field squared, or:
P(E V/m) = E
2
P(1 V/m)
Actual transmitted field strength should be verified using an ETS-Lindgren
electric field probe, or equivalent.
For IEC/EN 31000-4-3 type testing, the antenna tip can be placed at any
distance between one and three meters from the EUT as long as the front face
plane is illuminated according to the -0, +6 dB uniform field specification. In
general, closer distances require less power to create a given field strength.
22 |
Application