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Rev091918
7
7
.
.
2
2
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s
When any coil other than the two standard 1m x 1m and 1m x 2.6m single-turn
coils is used, and the
coil factor
and/or
test volume
are not known, they must be
determined by performing magnetic field measurements without the EUT present.
7
7
.
.
2
2
.
.
1
1
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The coil factor is the ratio between the magnetic field generated by an
inductive coil and the corresponding current value.
In order to determine the coil factor for any antenna, the magnitude of
the field at the center of the coil must be measured using a suitable
magnetic field meter while monitoring the current through the coil. The
measured field (in A/m) divided by the coil current (in amperes) is the coil
factor.
The APF-5060 Magnetic Field Generator, along with a suitable magnetic
field meter are used to determine the coil factor according to the
following procedure:
S
S
t
t
e
e
p
p
#
#
1
1
Using the USER Test Setup Menu, set the four variable test
parameters to the values shown below:
TEST LEVEL:
30 A/m
TEST FREQ.:
50 Hz
COIL FACTOR:
01.00
TIME:
00:10:00
S
S
t
t
e
e
p
p
#
#
2
2
Place the magnetic field meter with its antenna/sensor at the
center of the coil as shown in Figure 19.
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