Figure
4-15.
CE03
P
o
w
er
Lead
T
est
Setup
(Air
Force
and
Na
vy)
Curren
t
prob es
are
used
as
the
transducer
for
most
military
conducted
emission
tests.
The
prob e,
whic
h
is
clamp
ed
around
the
wire
of
in
terest,
is
exp osed
to
the
magnetic
eld
pro duced
b
y
the
curren
t
in
the
wire.
The
resulting
output
v
oltage
of
the
prob e
is
prop ortional
to
the
curren
t
lev
el,
frequency
,
and
prob e
c
haracteristics
suc
h
as
p ermeabilit y
,
cross-sectional
area
and
n
um
b er
of
turns.
T
o
determine
the
curren
t
lev
el
asso
ciated
with
a
particular
v
oltage
the
transfer
imp edance
(Z
)
of
the
prob e
m
ust
b e
kno
wn.
By
subtracting
the
transfer
imp edance
(dB)
from
the
v
oltage
(dBV)
measured
on
the
receiv
er,
the
equiv
alen
t
curren
t
(dBA)
can
b e
calculated.
As
an
alternate,
a
comp osite
limit
in
dBV
may
b e
determined
b
y
adding
Z
(dB)
to
the
limit
(dBA).
Be
careful
not
to
exceed
the
curren
t
rating
limitations
of
the
prob e
as
this
could
saturate
the
core
of
the
prob e
and
result
in
measuremen
t
errors.
Matching
transformers
or
in
v
erse
ampliers
may
b e
emplo
y
ed
to
ac
hiev
e
a
Z
of
0
dB
o
v
er
a
wide
frequency
range.
See
Figure
4-16.
4-24
Making
Typical
Measurements
HP
8572A
EMI
Receiv
er
User's
Guide